JP6245620B2 - Light source evaluation device - Google Patents

Description

The present invention relates to a light source evaluation equipment. In particular, it is preferably used when evaluating the light source of a solar simulator for measuring the performance of a solar cell.

  Conventionally, a solar simulator has been used to measure performance such as photoelectric conversion efficiency of a solar cell. In order to measure the performance of the solar cell fairly, the JIS standard and the IEC standard stipulate that the light emitted from the light source of the solar simulator has almost the same spectral irradiance as that of the reference sunlight. Therefore, a light source evaluation apparatus that evaluates whether the light emitted from the light source of the solar simulator matches the standard is used.

  Patent Document 1 discloses a light source evaluation apparatus having a spectral radiometer for measuring the spectral irradiance of light emitted from a solar simulator. The light source evaluation apparatus of Patent Document 1 is based on the solar simulator based on the spectral irradiance of light radiated from the solar simulator measured by the spectroradiometer, the spectral irradiance of natural sunlight, and the spectral sensitivity of the solar cell. The evaluation value of the characteristic of the emitted light is calculated.

International Publication No. 2010/150695 Pamphlet

However, the light source evaluation apparatus of Patent Document 1 separates light from a light source to be measured by a spectroradiometer using a spectroscope. When performing spectroscopy with a spectroradiometer using a spectroscope, the structure of the light source evaluation device is complicated by a diffraction grating, a prism, etc., resulting in increased manufacturing costs and poor stability over time. is there.
The present invention has been made in view of the above-described problems, and an object thereof is to simplify the structure of a light source evaluation apparatus, to reduce manufacturing costs, and to improve stability.

The light source evaluation apparatus of the present invention is a light source evaluation apparatus for evaluating a light source of a solar simulator, and is arranged in a matrix and receives a plurality of solar cells that receive light emitted from the light source, and the plurality of solar cells. are respectively disposed between the and the cell source, have a different transmission wavelength band, the spectral transmittance as the product of the spectral sensitivity of the solar cells is constant within the transmission wavelength band, the spectral Between a plurality of optical filters having transmittances , an arithmetic unit that calculates the spectral coincidence of the light source with respect to natural sunlight from each irradiance received by the plurality of solar cells, and between different transmission wavelength bands Each of them stores a correction coefficient between wavelength bands that makes the product of the spectral sensitivity of the solar battery cell and the spectral transmittance of the optical filter constant when receiving natural sunlight. It includes a part, wherein the calculation unit, and calculates the spectral coincidence degree of the light source by using a value obtained by multiplying the wavelength band between the correction coefficient of the current value of the solar cell.

  According to the present invention, the light emitted from the light source is transmitted through the plurality of optical filters having different transmission wavelength bands and received by the plurality of light receivers, thereby simplifying the structure of the light source evaluation apparatus. Manufacturing costs can be reduced.

FIG. 1 is a diagram illustrating an external configuration of a light source evaluation apparatus. FIG. 2 is a diagram illustrating an internal configuration of the light source evaluation apparatus. FIG. 3 is a diagram illustrating a configuration of the light receiving device and the optical filter device. FIG. 4 is a diagram showing the spectral sensitivity of the solar battery cell and the spectral transmittance of the band-pass filter. FIG. 5 is a diagram showing the product of the spectral sensitivity of the solar battery cell and the spectral transmittance of each bandpass filter. FIG. 6 is a diagram illustrating a correspondence table that stores information associated with each wavelength band. FIG. 7 is a flowchart illustrating processing of the information processing apparatus. FIG. 8 is a flowchart showing the measurement of the correction coefficient between cells. FIG. 9 is a flowchart showing measurement of the degree of spectral coincidence. FIG. 10 is a flowchart showing the measurement of irradiance unevenness. FIG. 11 is a flowchart showing the measurement of the time variation rate of irradiance. FIG. 12 is a diagram showing an energy distribution for each wavelength band in the reference sunlight. FIG. 13 is a diagram in which the energy distribution and the like are displayed on the display unit. FIG. 14 is a diagram in which the energy distribution is displayed as a graph on the display unit. FIG. 15 is a diagram illustrating a configuration of the rotating unit. FIG. 16A is a diagram illustrating a state in which the rotating unit is rotated 90 degrees. FIG. 16B is a diagram illustrating a state where the rotating unit is rotated 180 degrees. FIG. 16C is a diagram illustrating a state where the rotating unit is rotated by 270 degrees.

Hereinafter, a light source evaluation apparatus (light source evaluation system) 10 according to the present embodiment will be described with reference to the drawings.
In the present embodiment, a case where the light source evaluation device 10 evaluates the light source 101 of the solar simulator 100 will be described. In the present embodiment, when light is emitted from a light source to be measured through, for example, a mirror or a lens, the light that is finally emitted is evaluated.

FIG. 1 is a diagram illustrating an example of an external configuration of the light source evaluation device 10. FIG. 2 is a diagram illustrating an example of the internal configuration of the light source evaluation apparatus 10.
The light source evaluation device 10 includes a light receiving device 20, a conversion device 25, an information processing device 30, an optical filter device 40, and the like.
The light receiving device 20 receives light emitted from the light source 101 of the solar simulator 100 and outputs an output value corresponding to the received irradiance to the information processing device 30 via the conversion device 25.
The light receiving device 20 of the present embodiment includes a solar battery cell 21 as a light receiver, a position detection unit 22, and an I / F unit 23. A plurality of solar cells 21 are arranged in a matrix. The position detection unit 22 detects the position of a later-described rotation unit 42, specifically, a rotation angle. The I / F unit 23 is connected to a cable connected to the conversion device 25.

The light receiving device 20 shown in FIG. 1 has a total of 64 solar cells 21 with eight columns (columns) and eight rows (rows), and the region where the solar cells 21 are arranged is formed in a square shape. The In addition, as shown in FIG. 1, solar cells 21 ₁₁ ,... 2 columns × 1 rows of solar cells 21 ₂₁ ,. a row of solar cells and solar cell _{21 81.} Each solar cell 21 outputs a current value of a short circuit current (hereinafter referred to as a current value) as an output value corresponding to the received irradiance.

  The conversion device 25 performs A / D conversion on the current value output from the light receiving device 20 and transmits it to the information processing device 30. The conversion device 25 includes a conversion unit 26 and an I / F unit 27. The converter 26 A / D converts the current value. The I / F unit 27 is connected to a cable connected to the light receiving device 20 and a cable connected to the information processing device 30.

  The information processing device 30 evaluates the light source 101 of the solar simulator 100 based on the irradiance of the solar battery cell 21, specifically, the current value received from the light receiving device 20. The information processing apparatus 30 includes a display unit 31, a control unit 32, an I / F unit 33, an operation unit 34, and a storage unit 35. The information processing apparatus 30 can be configured by a computer, for example.

The display unit 31 displays the result of evaluating the light source 101 and the like. The control unit 32 controls the entire information processing apparatus 30. The I / F unit 33 is connected to a cable connected to the conversion device 25. The operation unit 34 is used when a user inputs to the information processing apparatus 30. The storage unit 35 stores an inter-wavelength correction coefficient Mn, an inter-cell correction coefficient Kn, an energy distribution D _AM (n) of reference sunlight, a correspondence table, and the like, which will be described later.
The control unit 32 includes a calculation unit 36, a storage control unit 37, an input / output control unit 38, and a display control unit 39. The calculation unit 36 calculates the degree of spectral coincidence, the irradiance location unevenness, the irradiance temporal variation rate, and the like, which will be described later. The storage control unit 37 controls the storage unit 35 to store and read information. The input / output control unit 38 controls input via the operation unit 34 and input / output with the outside via the I / F unit 33.

The information processing apparatus 30 according to the present embodiment includes, as items for measuring the light source 101, (a) measurement of spectrum matching degree, (b) measurement of irradiance location unevenness, and (c) measurement of time variation rate of irradiance. Is possible.
(A) The measurement of the degree of spectral coincidence is to measure the degree of coincidence for each wavelength range of light emitted from the light source to be measured and irradiated to the light receiving surface with respect to reference sunlight or the like. Specifically, the wavelength bands of 400 nm to 1100 nm are defined in six wavelength bands as specified in the JIS standard and IEC standard, specifically, 400 nm to 500 nm, 500 nm to 600 nm, 600 nm to 700 nm, 700 nm to 800 nm, 800 nm to The spectrum is divided into 900 nm and 900 nm to 1100 nm, and the degree of spectral coincidence with reference sunlight is measured for each divided wavelength band.
(B) Measurement of irradiance location unevenness is to measure the level of irradiance in a region (location) emitted by a light source.
(C) The measurement of the time variation rate of irradiance is to measure the value at which the irradiance radiated from the light source fluctuates per time.

The light source evaluation apparatus 10 of the present embodiment does not perform spectroscopy using a spectroradiometer using a spectroscope as described in Patent Document 1, and uses a light receiver such as a solar battery cell 21 for each wavelength band. In order to enable measurement of the degree of spectral coincidence, an optical filter device 40 is provided.
As shown in FIG. 1, the optical filter device 40 is disposed between the light source 101 and the light receiving device 20 and transmits light for each desired wavelength band among the light emitted from the light source 101. Therefore, the light receiving device 20 can receive light for each desired wavelength band transmitted by the optical filter device 40.

The optical filter device 40 includes a base 41, a rotating unit 42, and an optical filter unit 43. The base 41 is detachable with respect to the light receiving device 20 and is supported so as to be rotatable about a rotation shaft (R shown in FIG. 1) of the rotation unit 42. It should be noted that the user attaches the optical filter device 40 to the light receiving device 20 when measuring the degree of spectral coincidence (a) described above. On the other hand, it is not necessary for the user to perform spectral separation for each desired wavelength band. (B) Measurement of irradiance unevenness, (c) Measurement of time variation rate of irradiance, (d) Inter-cell correction coefficient For measurement, the optical filter device 40 is detached from the light receiving device 20.
The rotating part 42 is formed in a disc shape and supports the optical filter part 43 at the center.

The optical filter unit 43 includes a plurality of band-pass filters 44 as optical filters arranged in a matrix. The optical filter unit 43 shown in FIG. 1 has a total of 64 bandpass filters 44 with eight columns (columns) and eight rows (rows), and the area where the bandpass filters 44 are arranged is formed in a square shape. Is done. As shown in FIG. 1, a band pass filter 44 ₁₁ ... 2 band × 1 row bandpass filter 44 ₂₁ ,... 8 columns × 1 is used. the bandpass filter line and bandpass filter 44 _81.

Each band pass filter 44 is disposed above (directly above) each solar cell 21. Therefore, the light emitted from the light source 101 and transmitted through each bandpass filter 44 is received by each lower (directly below) solar cell 21. For example, light transmitted through the bandpass filter 44 ₁₁ is received by the solar battery cell 21 ₁₁ .

  Here, the band pass filter 44 of this embodiment has at least six different transmission wavelength bands. Specifically, it has a transmission wavelength band in which the wavelength band of 400 nm to 1100 nm is divided into six wavelength bands of 400 nm to 500 nm, 500 nm to 600 nm, 600 nm to 700 nm, 700 nm to 800 nm, 800 nm to 900 nm, 900 nm to 1100 nm. ing. Thus, the band-pass filter 44 having different transmission wavelength bands has continuous transmission wavelength bands within 400 nm to 1100 nm.

Below, in order to make an understanding easy, the form which simplified the structure of the light-receiving device 20 and the optical filter apparatus 40 as shown in FIG. 3 is demonstrated. In FIG. 3, the light receiving device 20 is configured by _six solar cells 21 _{1 to} 21 ₆ , and the optical filter device 40 is configured by six band pass filters 44 _{1 to} 44 ₆ disposed above each solar cell 21. Is done.

Optical filter apparatus 40 shown in FIG. 3 includes a band-pass filter 44 ₁ is a transmission wavelength band of 400 nm to 500 nm, the band pass filter 44 ₂ has a transmission wavelength band of 500 nm to 600 nm, a band pass filter 44 ₃ has a transmission wavelength band of 600 nm to 700 nm, a band-pass filter 44 ₄ a transmission wavelength band of 700 nm to 800 nm, a band-pass filter ₄₄₅ is a transmission wavelength band of 800 nm to 900 nm, the band-pass filter 44 ₆ Has a transmission wavelength band of 900 nm to 1100 nm.
Thus, in order to transmit the light of the desired wavelength band to the band pass filter 44 and cut the light of the other wavelength bands, the band pass filter 44 is manufactured according to the wavelength band in the manufacturing process. This can be realized by forming a multilayer vapor deposition film structure or by mixing a dye into the glass on which the film is deposited.

Accordingly, each solar battery cell 21 receives light in the wavelength band transmitted by each bandpass filter 44 from the light emitted from the light source 101. Specifically, the solar cell 21 ₁ is receiving a light in a wavelength band of 400 nm to 500 nm, the solar cell 21 ₂ receives a light having a wavelength band of 500 nm to 600 nm, the solar cell 21 ₃ is 600nm~700nm receiving light wavelength band of the solar battery cell 21 ₄ receives light in a wavelength band of 700 nm to 800 nm, the solar cell 21 ₅ receive light in a wavelength band of 800 nm to 900 nm, the solar cell 21 ₆ Receives light in the wavelength band of 900 nm to 1100 nm.

Here, when the solar cell 21 is used in the light receiver as in the present embodiment, the solar cell 21 has a spectral sensitivity depending on the wavelength.
FIG. 4 is a diagram showing the spectral sensitivity according to the wavelength of the crystalline solar battery cell. As shown by the solid line in FIG. 4, the spectral sensitivity of the solar battery cell 21 is 0.3 at 400 nm, gradually increases from 400 nm to around 900 nm, and 1.0 at around 900 nm. On the other hand, it suddenly decreases from 900 nm to 1100 nm and is 0.3 near 1100 nm.

  Here, it is assumed that the light source having an irradiance peak at 400 nm and the light source having an irradiance peak at 900 nm have the same energy. In this case, due to the spectral sensitivity as shown in FIG. 4, the current values output from the solar cells 21 when receiving light from each light source are not the same. Specifically, a larger current value is output when a light source having a peak of irradiance at 900 nm with high spectral sensitivity is received.

Therefore, in this embodiment, the influence of the spectral sensitivity corresponding to the wavelength of the solar battery cell 21 is removed by the following two processes. First, the first, so that the product of the spectral sensitivity of the spectral transmittance and the solar cell 21 of the band-pass filter 44 is constant within the transmission wavelength band, the spectral transmittance of each bandpass filter 44 ₁ to 44 ₆ Set.
That is, when the spectral sensitivity B (λ) of the solar battery cell 21 is set, the spectral transmittances Fn (λ) of the bandpass filters 44 _{1 to} 44 ₆ are set, and λ is a wavelength,
B (λ) × Fn (λ) = Ln
To be. Ln is a constant, and n is an integer from 1 to 6.
Therefore, Fn (λ) = Ln / B (λ).

FIG. 4 shows the spectral transmittance set for each of the bandpass filters 44 _{1 to} 44 ₆ . As shown in FIG. 4, for example, a band-pass filter 44 _1, the spectral transmittance is set to be suddenly lowered curved accordance shifts from 400nm to 500 nm. Further, the band-pass filter 44 _{2-44 5,} the spectral transmittance is set to be lower curved accordance shifts to higher wavelength from similarly low wavelength. However, the band-pass filter _445, compared to the band-pass filter 44 _1, the change in spectral transmittance becomes gradual. On the other hand, the band-pass filter 44 _6, the spectral transmittance is set to be higher curved accordance shifts to higher wavelength from lower wavelengths.
As described above, in order to lower or increase the spectral transmittance while setting the gradual speed as the bandpass filter 44 shifts from a low wavelength to a high wavelength, the manufacturing process of the bandpass filter 44 is not limited. This can be realized by increasing or decreasing the number of layers of the multilayer deposited film in the deposition process, increasing or decreasing the layer thickness, or mixing a pigment into the glass on which the film is deposited.

Figure 5 is a diagram showing a product of the spectral sensitivity and the band-pass filters 44 ₁ to 44 ₆ spectral transmittance of the solar cell 21. As shown in FIG. 5, the product of the spectral sensitivity and the spectral transmittance is constant within the transmission wavelength band of each of the bandpass filters 44 _{1 to} 44 ₆ . For example, the product of the spectral sensitivity and the bandpass filter 44 ₁ spectral transmittance is always 0.25, the product of the spectral sensitivity and the band pass filter 44 ₂ of the spectral transmittance is always 0.5.
However, since the product of spectral sensitivity and spectral transmittance is different for each wavelength band, when receiving light sources of the same energy that have spectral irradiance peaks at different wavelengths, the solar light is still received when each light source is received. The current values output by the battery cells 21 are not the same.

Therefore, secondly, a correction coefficient between wavelength bands is calculated for each wavelength band so that the product of the spectral sensitivity and the spectral transmittance is constant between different transmission wavelength bands.
That is, assuming that the spectral sensitivity B (λ) of the solar battery cell 21, the spectral transmittance Fn (λ) of the band-pass filters 44 _{1 to} 44 ₆ , and the correction coefficient Mn between the wavelength bands,
B (λ) × Fn (λ) × Mn = P
To be. P is a constant, and n is an integer from 1 to 6.
Therefore, Mn = P / (B (λ) × Fn (λ)) = P / Ln
That is, Ln = P / Mn.

Here, for example, when the constant P is 1.0, the wavelength band correction coefficient M ₁ that sets the product of the spectral sensitivity and the spectral transmittance of the band-pass filter 44 ₁ to 1.0 is 1.0 / 0.0. 25 = 4 is calculated. Moreover, as the wavelength band between the correction factor _{M 2} of the product to 1.0 with spectral sensitivity and the band pass filter 44 and _second spectral transmittance, 1.0 / 0.5 = 2 it is calculated. Similarly, inter-wavelength band correction coefficients M _{3 to} M ₆ that calculate the product of the spectral sensitivity and the spectral transmittance of the other band pass filters 44 _{3 to} 44 ₆ as 1.0 are calculated.
The calculated inter-wavelength band correction coefficients M _{1 to} M ₆ are respectively multiplied by the current values of the solar cells 21 that have passed through and received the band-pass filters 44 _{1 to} 44 ₆ as will be described later. Therefore, when natural sunlight is received, it can correct | amend so that the electric current value output by each photovoltaic cell 21 may become the same even if it is between different transmission wavelength bands.

  The calculated inter-wavelength band correction coefficient Mn is stored in the correspondence table of the storage unit 35 in association with each wavelength band. FIG. 6 is a diagram illustrating an example of the correspondence table. In the correspondence table shown in FIG. 6, for each wavelength band, a bandpass filter 44n, a wavelength band correction coefficient Mn, a solar cell 21n, and an intercell correction coefficient Kn described later are stored in association with each other.

Next, a method for evaluating the light source 101 using the light source evaluation apparatus 10 configured as described above will be specifically described. The processing of each flowchart described below is realized by the CPU of the information processing device 30 executing a program stored in a ROM or the like.
FIG. 7 is a flowchart showing processing of the information processing device 30 of the light source evaluation device 10. The flowchart of FIG. 7 is started in response to an instruction for the user to execute the program via the operation unit 34.

  In step S70, the display control unit 39 displays the measurement items on the display unit 31 so that they can be selected. Specifically, (a) measurement of spectral coincidence, (b) measurement of irradiance unevenness of location, (c) measurement of time variation rate of irradiance, and (d) measurement of correction coefficient between cells. Display measurement items. Here, (d) the measurement of the inter-cell correction coefficient is selected when calculating the inter-cell correction coefficient for correcting the variation in the current value output from each solar cell 21 when natural sunlight is received. Is done.

In step S71, the input / output control unit 38 determines whether (d) measurement of the inter-cell correction coefficient is selected by the user. (D) If the measurement of the inter-cell correction coefficient is selected, the process proceeds to step S72, and if not selected, the process proceeds to step S73. The measurement of the correction coefficient between cells by step S72 is later mentioned with reference to the flowchart of FIG.
In step S <b> 73, the input / output control unit 38 determines whether or not (a) measurement of spectrum matching degree has been selected by the user. (A) If the measurement of the spectral coincidence is selected, the process proceeds to step S74, and if not, the process proceeds to step S75. The measurement of the degree of spectral coincidence in step S74 will be described later with reference to the flowchart of FIG.

In step S <b> 75, the input / output control unit 38 determines whether (b) measurement of irradiance location unevenness has been selected by the user. (B) When the measurement of the irradiance unevenness is selected, the process proceeds to step S76, and when it is not selected, the process proceeds to step S77. The measurement of the irradiance unevenness in step S76 will be described later with reference to the flowchart of FIG.
In step S77, the input / output control unit 38 determines whether (c) measurement of the time variation rate of irradiance has been selected by the user. (C) When the measurement of the time variation rate of the irradiance is selected, the process proceeds to step S78, and when it is not selected, the process proceeds to step S79. The measurement of the time variation rate of the irradiance in step S78 will be described later with reference to the flowchart of FIG.

  In step S79, the input / output control unit 38 determines whether or not the user has instructed termination. If the end is instructed, the process ends. If the end is not instructed, the process returns to step S71.

Next, the measurement of the correction coefficient between cells will be described with reference to the flowchart of FIG. Here, the user leaves the optical filter device 40 from the light receiving device 20. Further, the user removes the light source 101 to be measured and installs the light source evaluation device 10 so that natural sunlight is emitted to the light receiving device 20.
In step S80, the input / output control unit 38 receives the current value of the short-circuit current for each solar cell 21 that has received natural sunlight. Even when the solar battery cell 21 receives light with no unevenness such as natural sunlight, a current value that varies among the solar battery cells 21 is output.

In step S <b> 81, the calculation unit 36 calculates an inter-cell correction coefficient Kn corresponding to each solar battery cell 21 based on the received current value. For example, the current value of the solar cell 21 ₁ is 100 mA, the current value of the solar cell 21 ₂ is 90 mA, and were current 110 mA · · · of the solar cell 21 _3. In this case, the calculation unit 36 calculates the inter-cell correction coefficient Kn so that the current value is 100 mA, which is an average value, for example. Therefore, calculation unit 36, an inter-cell correction factor _{K 1} of the solar cell 21 ₁ 1.0, the solar cell 21 between the _second cell correction factor _{K 2} of 100/90, intercell correction of the solar cell 21 ₃ calculating the coefficient _{K 3} as 100/110.

In step S <b> 82, the display control unit 39 displays the calculated inter-cell correction coefficient Kn on the display unit 31 for each solar cell 21. The storage control unit 37 stores the calculated inter-cell correction coefficient Kn in association with the solar battery cell 21. Specifically, the storage control unit 37 stores the inter-cell correction coefficient Kn in association with the solar battery cell 21 in the correspondence table shown in FIG. Thereafter, the process returns to step S71 shown in FIG.
When the inter-cell correction coefficient Kn is not stored in the storage unit 35, the display control unit 39 may select only (d) measurement of the inter-cell correction coefficient in step S70 of FIG. 7 described above.
The inter-cell correction coefficient Kn is preferably calculated by the manufacturer when the light source evaluation device 10 is manufactured, and stored in the storage unit 35 in advance. In this case, (d) measurement of the inter-cell correction coefficient can be omitted from the measurement items that can be selected in step S70 of FIG.

Next, the measurement of the degree of spectral coincidence will be described with reference to the flowchart of FIG. Here, the user attaches the optical filter device 40 to the light receiving device 20. In addition, the user installs the light source evaluation device 10 so that the light source 101 to be measured passes through the optical filter device 40 and is emitted to the light receiving device 20.
In step S <b> 90, the storage control unit 37 reads data of energy distribution for each wavelength band of the reference sunlight from the storage unit 35. FIG. 12 shows an example of the energy distribution D _AM (n) for each wavelength band in the reference sunlight (AM1.5). In addition to the reference sunlight (AM1.5), the storage unit 35 includes sunlight outside the atmosphere (AM0), sunlight that is perpendicularly incident on the surface of the earth (AM1.0), sunlight in sunlight, and sunset. The energy distribution for each wavelength band is stored in advance. The storage control unit 37 reads any one energy distribution data according to the user's selection.

In step S <b> 91, the storage control unit 37 reads the inter-wavelength correction coefficient Mn associated with each wavelength band and the inter-cell correction coefficient Kn associated with each solar battery cell 21.
In step S <b> 92, the input / output control unit 38 receives a current value for each photovoltaic cell 21 that has passed through each bandpass filter 44 and received light from the light source 101.
In step S93, the calculation unit 36 calculates the energy distribution [%] on the light receiving surface (here, the light receiving surface is the surface of the bandpass filter 44) of the light emitted from the light source 101 for each wavelength band based on the received current value. To do.
First, the current value In for each solar cell 21 and the energy En on the surface of the bandpass filter 44 of the light source for each wavelength band are expressed by the following equations.

したがって、

Therefore,

For example, for the energy E ₁ of the light source in the wavelength band of 400 nm to 500 nm, Kn is the inter-cell correction coefficient K ₁ associated with the solar cell 21 ₁ , and the inter-wavelength correction is associated with the wavelength band of Mn of 400 nm to 500 nm. coefficient M _1, S (lambda) is (spectral irradiance emitted to the bandpass filter 44 ₁₎ the spectral irradiance of the band pass filter 44 surfaces of the light emitted from the light source 101, B (lambda) is the solar cell 21 spectral sensitivity of a Fn (lambda) is the spectral transmittance of the bandpass filter 44 _1.
Next, the energy distribution Dn of the light source for each wavelength band is expressed by the following equation.

Es is the energy of light received by all the solar cells 21. Further, i is a number obtained by dividing a predetermined wavelength band, and i = 6 in this embodiment.
Equation 2 can be expressed by the following equation based on Equation 1.

For example, in the energy distribution D ₁ in the wavelength band 400 nm to 500 nm, In is the current value I ₁ output from the solar battery cell 21 ₁ .
The calculation unit 36 calculates the energy distribution Dn of each wavelength band using Equation 3.
In step S94, the calculation unit 36 calculates the spectral coincidence for each wavelength band based on each energy distribution Dn calculated in step S93 and the energy distribution D _AM (n) of the reference sunlight read in step S90. calculate. Specifically, the degree of spectral coincidence can be calculated by Dn / D _AM (n).

  In addition, the calculation unit 36 calculates the grade of the light source to be measured for each wavelength band based on the degree of spectral coincidence. For example, when the spectrum matching degree is close to 1.0, the calculation unit 36 calculates as class B and class C as the distance from class A and 1.0 increases. Furthermore, the calculating part 36 evaluates the whole light source based on the calculated grade. For example, when all the wavelength bands are class A, the calculation unit 36 evaluates the light source to be measured as a grade A, and when there is even one class B, evaluates it as a grade B or the like.

  In step S95, the display control unit 39 displays the calculated energy distribution, spectrum matching degree, class for each wavelength band, and light source evaluation on the display unit 31. FIG. 13 is a diagram showing an example in which the energy distribution, the degree of spectral coincidence, the class for each wavelength band, and the evaluation of the light source are displayed on the display unit 31 in a table. Therefore, the user can confirm how much the light source to be measured matches the spectrum of the reference sunlight.

Further, the display control unit 39 may display the calculated energy distribution on the display unit 31 as a graph. FIG. 14 is a diagram illustrating an example in which the energy distribution is displayed on the display unit 31 by a graph. In FIG. 14, the energy distribution of the light source to be measured and the reference sunlight for each wavelength band is shown with the energy distribution on the vertical axis and the wavelength on the horizontal axis.
Thereafter, the process returns to step S71 shown in FIG.

Next, measurement of irradiance unevenness will be described with reference to the flowchart of FIG. Here, the user leaves the optical filter device 40 from the light receiving device 20. In addition, the user installs the light source evaluation device 10 so that the light source 101 to be measured is emitted to the light receiving device 20.
In step S <b> 100, the storage control unit 37 reads the inter-cell correction coefficient Kn associated with each solar battery cell 21.
In step S <b> 101, the input / output control unit 38 receives a current value for each solar cell 21 that has received light from the light source 101.

  In step S <b> 102, the calculation unit 36 calculates the location unevenness of the irradiance based on the received current value. Specifically, the calculation unit 36 multiplies the inter-cell correction number Kn associated with each solar cell 21 by each received current value, thereby correcting the variation in the current value output by the solar cell 21. . Next, the calculating part 36 adds each corrected electric current value, and calculates | requires the average value of an electric current value by dividing by the number of photovoltaic cells. Next, the calculating part 36 calculates a spot unevenness by calculating | requiring the ratio of the electric current value after correction | amendment of each photovoltaic cell 21n, and an average value.

In step S <b> 103, the display control unit 39 displays the ratio between the corrected current value and average value of each solar cell 21 on the display unit 31 for each solar cell 21. Therefore, the user can confirm the location unevenness such as whether the irradiance at the location where the specific solar battery cell 21 is arranged is higher or lower than the average value. The calculation unit 36 can calculate the evaluation of the light source based on the location unevenness, and can display the evaluation of the light source calculated by the display control unit 39.
Thereafter, the process returns to step S71 shown in the flowchart of FIG.

Next, measurement of the time variation rate of irradiance will be described with reference to the flowchart of FIG. Here, the user leaves the optical filter device 40 from the light receiving device 20. In addition, the user installs the light source evaluation device 10 so that the light source 101 to be measured is emitted to the light receiving device 20.
In step S110, the input / output control unit 38 receives a predetermined current value of the solar battery cell 21. Subsequently, the input / output control unit 38 receives the current value of the same solar battery cell 21 after a predetermined time has elapsed.
In step S111, the calculating part 36 calculates the time variation rate of irradiance. Specifically, the calculation unit 36 calculates the time variation rate of the irradiance by obtaining a ratio between the first current value received in step S110 and the current value received after a predetermined time has elapsed.

In step S <b> 112, the display control unit 39 displays the calculated time variation rate of the irradiance on the display unit 31. Therefore, the user can confirm the time variation rate of how much the irradiance varies in a predetermined time. The calculation unit 36 can calculate the evaluation of the light source based on the time variation rate of the irradiance, and can display the evaluation of the light source calculated by the display control unit 39.
Thereafter, the process returns to step S71 of the flowchart of FIG.

  As described above, the light source evaluation apparatus 10 according to the present embodiment includes the plurality of band-pass filters 44 that are respectively disposed between the plurality of light receivers and the light source 101 and have different transmission wavelength bands. Therefore, each light receiver can receive light in a state in which the light from the light source 101 is dispersed for each different wavelength band. That is, since the light source evaluation apparatus 10 of this embodiment does not need to be spectrally separated by a spectroradiometer using a spectroscope, the structure can be simplified and the manufacturing cost can be reduced.

Moreover, in the light source evaluation apparatus 10 of this embodiment, since the solar battery cell 21 is used as a light receiver, the solar battery cell even when light is received in a short time such as 1 [msec], that is, 1 / 1,000 second. 21 outputs a current value. Therefore, it is possible to measure the degree of spectral coincidence of a light source of a solar simulator for a concentrating solar cell that is difficult to receive for a long time because light with high irradiance is emitted.
At this time, the plurality of bandpass filters 44 set the spectral transmittance so that the product of the spectral transmittance and the spectral sensitivity of the solar battery cell 21 is constant within the transmission wavelength band of each bandpass filter 44. By doing so, it can be handled so that there is no difference in the spectral sensitivity of the solar battery cell 21 within the transmission wavelength band.

  In addition, the storage unit 35 corrects the product between the spectral sensitivity of the solar battery cell 21 and the spectral transmittance of the band-pass filter 44 when receiving natural sunlight between different transmission wavelength bands. Store the coefficients. The calculating part 36 can correct | amend the dispersion | variation between wavelength bands by multiplying the electric current value of a photovoltaic cell by the correction coefficient between wavelength bands.

  In addition, the storage unit 35 stores an inter-cell correction coefficient that makes the current value constant when natural sunlight is received between different solar cells. The calculating part 36 can correct | amend the dispersion | variation in the electric current value between the photovoltaic cells 21 by multiplying the electric current value of a photovoltaic cell by the correction coefficient between cells.

  In the present embodiment, (a) by using a light receiver for measuring the degree of spectral coincidence, (b) measuring at least one of irradiance nonuniformity and (c) measuring the time variation rate of irradiance. Can be measured by the same light source evaluation apparatus 10. That is, a single light source evaluation apparatus 10 can perform a plurality of measurements, and when the user performs a plurality of measurements, it is not necessary to use a plurality of apparatuses, so that the measurement cost can be reduced.

Next, measurement of the degree of spectral coincidence using the rotating unit 42 will be described. In the measurement of the spectral coincidence using the rotating unit 42, the calculation unit 36 measures the spectral coincidence before and after the bandpass filter 44 is changed by the rotating unit 42, and the average value of the measured spectral coincidence is obtained as the final spectrum. Calculated as the degree of match.
Specifically, first, before rotating the rotating unit 42, the first spectral coincidence is measured by the process of the flowchart of FIG. 9 described above. At this time, the storage control unit 37 temporarily stores the first-time spectrum matching degree in the storage unit 35.

Next, the user rotates the rotating unit 42 with respect to the base 41 to change the band pass filter 44 so as to be on the upper side of the different solar cells 21. Here, 180 degrees around the rotation axis R of the rotating part 42 from the state shown in FIG. 3, by rotating, the light transmitted through the bandpass filter 44 ₁ will be the solar cell 21 ₆ is received. Similarly, the other band-pass filter 44 receives light from the solar cells 21 different from those before the rotation.

  When the rotation unit 42 is rotated, the position detection unit 22 of the light receiving device 20 detects the position of the rotation unit 42 and transmits the detected position information to the information processing device 30. Based on the received rotation information, the storage control unit 37 of the information processing device 30 changes the association for each wavelength band in the correspondence table shown in FIG. 6 to the solar cell 21n after rotation and the inter-cell correction coefficient Kn. The association of the solar battery cell 21 with the wavelength band after rotation is stored in advance in the correspondence table. On the other hand, the inter-cell correction coefficient Kn is stored in association with the rotated solar battery cell 21 in step S82 of the flowchart of FIG. The inter-cell correction coefficient Kn is preferably calculated by the manufacturer when the light source evaluation device 10 is manufactured, and is stored in advance in the rotated correspondence table.

  Next, the second spectral coincidence is measured by the process of the flowchart of FIG. 9 described above. At this time, the calculation unit 36 calculates the spectral coincidence based on the solar cell 21 and the inter-cell correction coefficient Kn shown in the correspondence table after rotation for the association for each wavelength band.

For example, assume a case of calculating the energy distribution _{D 1} of the wavelength band 400nm~500nm using equation 3. In this case, Mn is a wavelength band between the correction coefficient _{M 1} associated with the wavelength band of 400 nm to 500 nm. On the other hand, from the correspondence table after rotation shown in FIG. 6, is a solar cell 21 ₆ to transmission to receiving a band-pass filter 44 ₁ of the transmission wavelength band 400 nm to 500 nm. Therefore, Kn is a _{K 6} associated to the solar cell 21 _6, an In is a current value _{I 6} of the solar battery cells 21 _6.
Therefore, the calculation unit 36 can calculate the energy E ₁ in the wavelength band 400 nm to 500 nm by E ₁ = K ₆ × M ₁ × I ₆ . The energy E _{2 to} E _{6 in} other wavelength bands can be similarly calculated based on the correspondence table after rotation.
The calculation unit 36 calculates the second-time spectrum matching degree using the calculated energy En for each wavelength band, and the storage control unit 37 temporarily stores the second-time spectrum matching degree in the storage unit 35.

Next, the calculation unit 36 calculates the average value of the first and second spectrum matching degrees for the same wavelength band as the final spectrum matching degree. The display control unit 39 displays the finally calculated spectrum matching degree on the display unit 31.
As described above, when different solar cells 21 before and after the change of the bandpass filter 44 pass through the same bandpass filter 44 and receive light, the calculation unit 36 uses the respective current values of the different solar cells 21. The average value of the calculated spectrum matching degree is calculated as the final spectrum matching degree. Therefore, it is possible to calculate the degree of spectral coincidence that suppresses the influence of the irradiance unevenness of location.

As shown in FIG. 1, when there are more bandpass filters 44 than the number of divided wavelength bands, each bandpass filter 44 has one of the six transmission wavelength bands. That is, the optical filter unit 43 is configured by arranging a plurality of band-pass filters 44 having the same transmission wavelength band. Therefore, different solar cells 21 pass through the band-pass filter 44 having the same transmission wavelength band and receive light.
In this case, the calculation unit 36 calculates the average value of the degree of spectral coincidence calculated using the current values of the different solar cells 21 as the final degree of spectral coincidence. The suppressed degree of spectral coincidence can be calculated.

Further, as shown in FIG. 1, when the area where the solar cells 21 are arranged is a square and the area where the bandpass filter 44 is arranged is a square, the user holds the rotating unit 42 with respect to the base 4. 90 degrees, 180 degrees, and 270 degrees. At this time, the band-pass filter 44 arranged on the upper side of the solar battery cell 21 at each rotation angle is arranged to be a band-pass filter 44 having a different transmission wavelength band.
The computing unit 36 can calculate the average value of the first (0 degree) to the fourth (270 degree) spectrum matching degree as the final spectrum matching degree.

(Second Embodiment)
Next, as a second embodiment, a form of a different rotating unit will be described. In addition, the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
FIG. 15 is a diagram illustrating a configuration of the rotating unit 50 according to the second embodiment.
Each bandpass filter 44 of the rotation unit 50 of the present embodiment is obtained by reducing the size of the bandpass filter 44 of the first embodiment shown in FIG. 1 to ¼. Thus, the manufacturing cost of the optical filter device 40 can be reduced by reducing the bandpass filter 44.

16A to 16C are diagrams illustrating a state in which the rotating unit 50 is rotated 90 degrees, 180 degrees, and 170 degrees clockwise from the state illustrated in FIG. At this time, the band-pass filter 44 arranged on the upper side of the solar battery cell 21 at each rotation angle is arranged to be a band-pass filter 44 having a different transmission wavelength band. For example, the bandpass filters 44 ₁₁ , 44 ₁₈ , 44 ₈₈ , and 44 ₈₁ disposed on the upper side of the solar battery cell 21 ₁₁ for each rotation angle have different transmission wavelength bands.
In the configuration of the rotation unit 50 shown in FIG. 15, as described in the first embodiment, the calculation unit 36 finally calculates the average value of the first (0 degree) to the fourth (270 degree) spectrum matching degree. It is possible to calculate the degree of spectral coincidence.

As described above, the present invention has been described together with various embodiments. However, the present invention is not limited to these embodiments, and can be changed within the scope of the present invention or each embodiment can be combined. It is.
Moreover, although the case where the photovoltaic cell 21 was used as a light receiver was demonstrated in embodiment mentioned above, it is not restricted to this case. For example, a thermopile or a pyroelectric sensor can be used as the light receiver.
Moreover, although 6 wavelength bands were demonstrated in embodiment mentioned above, it can use similarly in the wavelength band smaller than six wavelength bands, or a wavelength band larger than six wavelength bands. Further, although the square lattice arrangement has been described as the arrangement of the light receivers, a hexagonal arrangement, a circular shape, and an arrangement in which the density of the light receivers varies depending on the location can be used similarly.

In the above-described embodiment, the case where the wavelength band of 400 nm to 1100 nm is divided into a plurality of wavelength bands as the predetermined wavelength band has been described. However, the present invention is not limited to this case. For example, a wavelength band wider than 400 nm to 1100 nm or a narrow wavelength band may be divided into a plurality, and the degree of spectral matching for each divided wavelength band may be calculated.
In the embodiment described above, the case where the predetermined wavelength band is divided into six wavelength bands has been described. However, the present invention is not limited to this case, and the predetermined wavelength band may be divided into at least six continuous wavelength bands. it can. In this case, it is possible to calculate the degree of spectral matching for each of the six or more wavelength bands that have been classified.

  In the present embodiment, the program for realizing the above-described processing is supplied to the light source evaluation apparatus 10 via a network or various storage media, and the program supplied by the CPU of the light source evaluation apparatus 10 is read and executed. . Further, a computer-readable recording medium storing the above-described program and a computer program product such as the above-described program can also be applied as an embodiment of the present invention. As the recording medium, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  The present invention can be used when evaluating a light source of a solar simulator for measuring the performance of a solar cell.

Claims (10)

A light source evaluation apparatus for evaluating a light source of a solar simulator,
A plurality of solar cells arranged in a matrix and receiving light emitted from the light source;
Is arranged between the light source and the plurality of solar cells, have a different transmission wavelength band, the spectral transmittance, the product of the spectral sensitivity of the solar cells is constant within the transmission wavelength band A plurality of optical filters set with the spectral transmittance ,
A calculation unit that calculates the degree of spectral coincidence of the light source with respect to natural sunlight from each irradiance received by the plurality of solar cells ;
A storage unit for storing a correction coefficient between wavelength bands, which makes a product of a spectral sensitivity of the solar battery cell and a spectral transmittance of the optical filter constant when receiving natural sunlight between different transmission wavelength bands; Have
The arithmetic unit calculates a spectral coincidence degree of the light source using a value obtained by multiplying the current value of the solar battery cell by the correction coefficient between wavelength bands . The storage unit stores an inter-cell correction coefficient that makes a current value constant when receiving natural sunlight between the plurality of solar cells,
The light source evaluation apparatus according to claim 1 , wherein the calculation unit calculates a spectrum matching degree of the light source using a value obtained by multiplying the current value of the solar battery cell by the inter-cell correction coefficient. The correction coefficient between wavelength bands is Mn, the correction coefficient between cells is Kn, the current value of the solar battery cell is In, i is the number of divisions within a predetermined wavelength band, and the energy distribution in each divided wavelength band Is Dn,
The computing unit is

The light source evaluation apparatus according to claim 2 , wherein the spectral coincidence degree of the light source is calculated using the energy distribution Dn in each wavelength band calculated by the above. Said plurality of optical filters, according to any one of claims 1 to 3, characterized in that it has any one of the transmission wavelength band of the transmission wavelength band is divided into six at least 400nm~1100nm Light source evaluation device. The computing unit measures unevenness of the irradiance of the light source based on irradiance of light received by the plurality of solar cells in a state where the plurality of optical filters are detached. The light source evaluation apparatus according to any one of claims 1 to 4 . The arithmetic unit, based on at least one of the irradiance received light by the solar cell of the plurality of the plurality in a state in which the optical filter is detached solar cells, the time variation of the irradiance of the light source source evaluation device according to any one of claims 1 and measuring the rate 5. When the different solar cells transmit and receive the optical filter having the same transmission wavelength band,
7. The calculation unit according to claim 1, wherein the calculation unit calculates an average value of the degree of spectral match calculated based on the irradiance of each of the solar cells as the final spectrum match of the light source . The light source evaluation apparatus according to item 1 . Optical filter disposed on an upper side of the solar cell depends a changeable optical filter, any one of claims 1 to 7, characterized in that the transmission wavelength band of the optical filter before and after the change is different 1 The light source evaluation apparatus according to item . A rotating unit that supports the plurality of optical filters, and a base that rotatably supports the rotating unit,
The light source evaluation according to claim 8 , wherein an optical filter disposed on the upper side of the solar battery cell can be changed to a different optical filter by rotating the rotating unit with respect to the base. apparatus. It said plurality of optical filters, light source evaluation apparatus according to any one of claims 1, characterized in that the transmission wavelength band is continuous 9.

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