JP2859926B2 - Pseudo sunlight irradiation device and spectrum adjusting method thereof - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a simulated sunlight irradiating apparatus and a spectrum adjusting method thereof, and more particularly to irradiating simulated sunlight suitable for a weather resistance and light resistance acceleration test of a product material. TECHNICAL FIELD The present invention relates to a simulated sunlight irradiation device and a spectrum adjusting method thereof.

(Prior art) As is well known, a pseudo-sunlight irradiation device is a device for reproducing the spectral distribution characteristics of natural sunlight with high accuracy from the ultraviolet region to the visible and infrared regions, and is used for fabrics.
It is used by being incorporated into an environmental test device for accelerated light / weather resistance testing of paints, plastics, metals, etc.

Xenon short arc lamps, xenon long arc lamps, carbon arc lamps, etc. are used as the light source of the conventional simulated sunlight irradiation device. Among them, the xenon short arc lamp (hereinafter, simply referred to as a xenon lamp) is particularly preferable. The spectral distribution is very similar to that of natural sunlight, and is often used as a simulated sunlight source.

However, the xenon lamp emits light in the near-infrared region (800 to 1000 nm) as shown in the spectrum distribution diagram in FIG.
In addition, since it has a sharp and complicated peak group, it is often used in combination with a spectrum distribution correction filter for correcting the average and making it close to the spectrum distribution of natural sunlight.

According to the conventional pseudo-sunlight irradiation device using such a correction filter, the spectral distribution approaches that of natural sunlight and can be used for practical use. It is almost impossible to manufacture a filter having characteristics with high accuracy and sufficient reproducibility, and it is not possible to selectively and sufficiently remove the peak group in the near-infrared region unique to a xenon lamp. Was.

Therefore, in the prior art using the correction filter,
800-1 unique to xenon lamps not included in natural sunlight
There is a problem that a lot of near-infrared components in the range of 000 nm remain.

In addition, as the above-mentioned correction filter, a multilayer deposition thin film type interference filter or a glass filter is widely used. However, the deposition type interference filter has a problem such as deterioration of characteristics over time and a film having uniform characteristics can be reproduced. There is a problem that it is difficult to produce well, and there is a problem that the glass filter is broken due to poor heat resistance.

In order to solve these problems, the inventors of the present invention have proposed a configuration in which a near-infrared component of a xenon lamp is removed using a water filter as described in JP-A-61-131301. is suggesting.

The water filter has a structure in which, for example, water is filled between glass plates provided to face each other, and irradiation light is transmitted through the water.

FIG. 6 is a diagram showing the spectral transmittance of a water filter having a thickness of 30 mm. As is clear from the figure, since the water filter has a characteristic of selectively absorbing light near the wavelength of 950 nm, if the near-infrared component of the xenon lamp is removed using this water filter, the eighth filter can be obtained. As shown in FIG.
In the region below 00 nm, the spectral distribution of natural sunlight (L
It is possible to obtain simulated sunlight (L3) sufficiently similar to 4).

(Problems to be Solved by the Invention) Such a water filter has high heat resistance and does not have a problem of characteristic deterioration. Moreover, there is an advantage that the characteristics can be realized uniformly and with good reproducibility.

However, although the water filter can considerably absorb the peak group in the near-infrared region as compared with the conventional correction filter, the water filter has an insufficient spectral absorption in the range of 900 to 1000 nm. As is clear from FIG. 7A, the spectrum component which cannot be completely removed still remains in the near-infrared region in the water filter.

In the light resistance and weather resistance acceleration test using a simulated sunlight irradiation device, light with an irradiation intensity several times the irradiation intensity of the reference sunlight is irradiated, so if there is a near infrared component that can not be removed,
This causes a problem that the sample is heated and accurate evaluation cannot be performed.

In particular, with regard to the light resistance and weather resistance test of exported product materials, it is necessary to appropriately adjust the spectrum distribution of simulated sunlight according to the climate of the export destination, the spectral distribution of sunlight, etc., and conduct tests in accordance with the conditions of the export destination. Although required, in the above-described water filter, the thickness has to be changed in order to change the spectral transmittance, so that the water filter has to be replaced according to the test content.

Therefore, the device must have a replaceable structure for the water filter, and the structure is complicated, and there is a problem that it takes time and effort.

An object of the present invention is to solve the above-described problems and provide a pseudo-sunlight irradiation device and a spectrum adjustment method capable of reproducing the spectral distribution of natural sunlight from the ultraviolet region to the visible and infrared regions with high accuracy. To provide.

(Means for Solving the Problems) In order to achieve the above-mentioned object, in the present invention, the mounting means for mounting the test material and the xenon lamp are relatively positioned around the tube axis of the xenon lamp as a rotation center. The following measures were taken in the pseudo solar light irradiation device provided to rotate.

(A) A liquid filter constituted by filling a solution containing metal ions is provided between the mounting means and the xenon lamp, and the xenon lamp light transmitted through the liquid filter is converted into pseudo sunlight. .

The spectrum of the simulated sunlight is adjusted by adjusting the concentration of the metal ions.

(B) between the mounting means and the xenon lamp, a plurality of incandescent filament lamps which are rotated relative to the mounting means with the tube axis of the xenon lamp as the center of rotation, and the xenon lamp light transmitted through the liquid filter; Then, irradiation light from a plurality of incandescent filament lamps was superimposed and mixed, and the chronological integrated light of both was set as pseudo sunlight.

Further, the spectrum of the simulated sunlight is adjusted by at least one of the adjustment of the concentration of the metal ions and the adjustment of the spectrum distribution of at least one of the plurality of incandescent filament lamps.

(Operation) (A) The xenon lamp has a specific spectral distribution in the near-infrared region in a pulsed manner, but has a relatively continuous spectral distribution in the ultraviolet region and the visible region and approximates natural sunlight.

Since the liquid filter has a low spectral transmittance in the near-infrared region, if the xenon lamp light is transmitted through the liquid filter, a peculiar pulse-like spectrum in the near-infrared region of the xenon lamp can be removed. And the spectral distribution of the pseudo sunlight by the xenon lamp can be approximated to natural sunlight.

Moreover, in such a liquid filter, the spectral transmittance can be adjusted by changing the metal ion concentration, so that the spectral distribution of the simulated sunlight by the xenon lamp can be easily adjusted.

(B) Since the incandescent filament lamp has a spectral distribution similar to natural sunlight in the infrared region, the incandescent filament lamp light is superimposed on light in the ultraviolet and visible regions selectively extracted from xenon lamp light. If mixed, pseudo sunlight approximated to natural sunlight can be obtained from the ultraviolet region to the infrared region.

Moreover, since the spectral distribution of the incandescent filament lamp changes when the filament temperature is changed by controlling the supply voltage and the like, the supply voltage and the like to each filament lamp should be adjusted to compensate for the difference between the xenon lamp light and natural sunlight. If the adjustment is made and the time-series integrated light of both is simulated sunlight, the spectral distribution characteristics can be further approximated to those of natural sunlight.

(Example) First, the basic concept of the present invention will be described.

Fig. 7 shows the spectral transmittance (thickness 3) of an aqueous solution of copper sulfate (CuSO ₄ ).
0 mm). As is clear from the comparison with the spectral transmittance of water shown in FIG. 6, the aqueous solution of copper sulfate has a low spectral transmittance in the near infrared region, that is, a high spectral absorption. I understand.

A solid line L5 shown in FIG. 8 (b) indicates a case where the near infrared component of the xenon lamp irradiation light is removed using a liquid filter formed by filling the copper sulfate aqueous solution in a transparent container such as a glass container. Spectral distribution diagram, solid line shown in FIG.
L3 is a spectrum distribution diagram when a liquid filter filled with water is used as described above.

The dashed line L4 in the figure indicates the spectral distribution characteristics of natural sunlight for comparison.

As is clear from the comparison between the two, the use of the copper sulfate aqueous solution filter removes more of the spectrum in the near-infrared region than the case of the water filter. Pseudo sunlight having the obtained spectral distribution can be obtained.

Therefore, in the present invention, a near infrared component of xenon lamp irradiation light is removed using a copper sulfate aqueous solution filter, and this is used as pseudo sunlight.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a side view of a simulated sunlight irradiation lamp unit according to one embodiment of the present invention, and FIG. 1 is a sectional view taken along the line AB of FIG.

1 and 2, a xenon lamp 5 held by a holding member 2 is housed in the center of the lamp unit 1, and a voltage is applied to both ends of the xenon lamp 5 from a lighting circuit (not shown). As a result, an arc is generated between the electrodes 12 in the xenon lamp 5, and light is emitted.

Around the xenon lamp 5, six borosilicate glass
A cylindrical UV filter 11 composed of 11a is provided. Note that the UV filter 11 may have a cylindrical shape made of borosilicate glass. This UV filter 11
Removes ultraviolet light having a wavelength of 300 nm or less that is not contained in sunlight but is contained in the irradiation light of the xenon lamp 5.

Around the UV filter 11, there are provided an inner cylinder 6a and an outer cylinder 6b each made of six pieces of quartz glass. The inner cylinder 6a and the outer cylinder 6b are composed of a support 9, a top plate 4, and a bottom plate 3.
The liquid filter 8 is formed by filling a copper sulfate aqueous solution 7 between the inner cylinder 6a and the outer cylinder 6b.

In such a configuration, the irradiation light from the xenon lamp 5 first removes unnecessary ultraviolet components by the UV filter 11, and then removes the near-infrared component by the liquid filter 8 as shown in FIG. Pseudo sunlight having a spectrum distribution as shown in b).

As is clear from the comparison with the case of using the liquid filter filled with water shown in FIG. 7A, according to the above-described configuration, pseudo sunlight having a spectrum distribution approximated to natural sunlight is obtained. Will be able to do it.

Further, in the liquid filter filled with the solution containing the metal ions, the spectral transmittance can be changed by changing the concentration of the metal ions.

FIG. 9 is a diagram showing a change in spectral transmittance due to a difference in copper ion concentration when an aqueous solution of copper sulfate is used as an optical filter.

As is clear from the figure, when the copper ion concentration is changed, the spectral transmittance changes according to the concentration. Therefore, if a liquid filter is formed by filling such a solution, the spectrum distribution of the simulated sunlight by the xenon lamp can be easily adjusted.

By the way, in such a copper sulfate aqueous solution filter, 50
Since the spectral transmittance in the region of 0 to 800 nm and in the region of about 1200 nm or more is low, the irradiation intensity in this region is weaker than that of natural sunlight.

Therefore, in the embodiment described below, the irradiation intensity in the region is supplemented by using an incandescent filament in combination.

FIG. 3 is a sectional view of a lamp unit according to another embodiment of the present invention, and FIG. 4 is a plan view thereof. The same reference numerals as those described above denote the same or equivalent parts.

In the same figure, each pillar 9 constituting the outer cylinder 6b has a rod-shaped incandescent filament (such as tungsten or halogen) 10
Are installed respectively.

FIG. 5 is a sectional view of a light / weather resistance tester to which the lamp unit having the above configuration is applied, and the same reference numerals as those described above denote the same or equivalent parts.

In the figure, a lamp unit 1 is a knurled screw.
It is fixed to the frame 41 by 40.

The test material 14 is attached to the test material hanger 17 extending from the fixed block 15 with the test surface facing the xenon lamp 5, and the fixed block 15 is fixed to the rotary table 13 by the bracket 16.

The shaft 21 integrally fixed to the turntable 13 is supported by a frame 41 by bearings 24 and connected to the rotation shaft of the motor 20 via worm gears 22 and 23. The turntable 13 is rotated at a desired rotation speed by the rotation of the motor 20.

In such a configuration, the irradiation light from the xenon lamp 5 first removes unnecessary ultraviolet components by the UV filter 11, and then removes near-infrared components by the liquid filter 8 as shown in FIG. Is simulated sunlight having a spectrum distribution as shown in FIG.

Further, the incandescent filament lamp 10 is turned on to superimpose and mix the two irradiation lights, and the motor 20 is driven to rotate the rotary table 13 so that the test material 14 and the xenon lamp 5 and the incandescent filament lamp 10 are relatively moved. By rotating them, the time-series integrated light of the two is made the final simulated sunlight.

At this time, the light emitted by the incandescent filament lamp 10 is
As shown in FIG. 11, when the filament temperature is controlled by appropriately adjusting the supplied voltage, current, frequency and the like, a spectrum distribution according to the filament temperature is shown.

In this embodiment, since the test material and the incandescent filament lamp rotate relatively, even if the spectrum distribution characteristics are different for each incandescent filament lamp, each test material has substantially uniform pseudo-sunlight. Light is applied.

Therefore, if the spectrum distribution of the simulated sunlight by the xenon lamp 5 is analyzed in advance, and the supply voltage and the like to each filament lamp 10 are individually controlled so as to compensate for the illuminance in a region where the illuminance is weaker than the natural sunlight, Pseudo sunlight, which is a time-series integrated light of both, comes to be very similar to natural sunlight.

In the case where the supply voltage and the like of each incandescent filament lamp 10 cannot be individually controlled, if the supply voltage and the like to each incandescent filament lamp 10 are controlled in a time-division manner, it is equivalent to the above. The effect of can be achieved.

In addition, a temperature detector is installed at the sample position, and when the detected temperature is lower than the desired temperature, the illuminance in the infrared region is increased, and when the detected temperature is high, the illuminance in the infrared region is reduced. As described above, by controlling the supply voltage to at least one of the xenon lamp 5 and each filament according to the detected temperature to adjust the spectrum, it is possible to automatically obtain the optimal simulated sunlight for the test contents. Will be able to

FIG. 13 is a sectional view of a lamp unit according to still another embodiment of the present invention, wherein the same reference numerals as those described above denote the same or equivalent parts.

The present embodiment is characterized in that a glass filter 80 for correcting the spectrum distribution of the xenon lamp 5 is provided in the liquid filter 8.

According to such a configuration, a rise in the temperature of the glass filter can be suppressed, so that problems such as breakage due to heating are eliminated.

The correction filter accommodated in the liquid filter 8 is not limited to a glass filter, but may be a vapor deposition filter. Further, the inner cylinder 6a and the outer cylinder constituting the liquid filter 8
A film is deposited on the surface of 6b, and the inner cylinder 6a or outer cylinder 6b is used as a vapor deposition filter, or the inner cylinder 6a or outer cylinder is used.
If 6b is made of a glass filter, the number of parts is reduced and the structure is simplified.

In each of the above-described embodiments, the copper sulfate aqueous solution was described as an example of the metal ion-containing solution to be filled in the liquid filter 8, but as shown in FIG. 10, for example, an iron sulfate aqueous solution (Fe2 (SO4 3) and the like, the spectral transmittance in the near infrared region is low, so that the same effect can be achieved even if an aqueous solution of iron sulfate is filled to constitute a liquid filter.

In the embodiments described with reference to FIGS. 3 and 4, the test material is described as rotating. However, the test material may be fixed and the incandescent filament lamp and the xenon lamp may rotate.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following effects are achieved.

(1) Since the solution containing metal ions has a low spectral transmittance in the near-infrared region, if a liquid filter is formed by filling such a solution, the specific characteristic of the xenon lamp generated in the near-infrared region is obtained. A simple pulse-like spectrum can be absorbed, and the spectrum distribution of the simulated sunlight by the xenon lamp can be extremely approximated to natural sunlight.

Moreover, in such a liquid filter, the spectral transmittance can be adjusted by changing the metal ion concentration, so that the spectral distribution of the simulated sunlight by the xenon lamp can be easily adjusted.

(2) Simultaneous use of an incandescent filament lamp and superimposition and mixing of incandescent filament lamp light with light in the ultraviolet region and visible region selectively extracted from the xenon lamp to obtain pseudo sunlight. It is possible to obtain simulated sunlight that is very similar to natural sunlight over the range from to the infrared region.

(3) Since the spectral distribution characteristics of each incandescent filament lamp can be adjusted by controlling the supply voltage and the like to the incandescent filament lamp, it is possible to obtain simulated sunlight that approximates natural sunlight. Become.

[Brief description of the drawings]

1 is a sectional view of a simulated sunlight irradiation lamp unit according to one embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view of a lamp unit according to another embodiment, FIG. 4 is a side view of FIG. 3, FIG. 5 is a cross-sectional view of a light / weather resistance tester to which the lamp units of FIGS. 3 and 4 are applied, FIG. 6 is a view showing a spectral transmittance of water, and FIG. FIG. 7 is a diagram showing a spectral transmittance of an aqueous solution of copper sulfate, FIG. 8 is a diagram showing a spectrum distribution of simulated sunlight by a xenon lamp, FIG. 9 is a diagram showing a change in a spectral transmittance due to a difference in copper ion concentration, FIG. 10 shows the spectral transmittance of the aqueous solution of iron sulfate, FIG. 11 shows the spectral distribution of the incandescent filament at each filament temperature, FIG. 12 shows the spectral distribution of the xenon lamp, and FIG. It is sectional drawing of the lamp unit of an example. 1 ... lamp unit, 2 ... holding member, 3 ... bottom plate,
4 top plate, 5 xenon lamp, 6a inner cylinder, 6b
... outer cylinder, 7 ... copper sulfate aqueous solution, 8 ... liquid filter, 9
… Prop, 10… Incandescent filament, 11… UV filter, 12… Electrode, 13… Rotary table, 14… Test material, 17… Test material hanger, 20… Motor

Claims (13)

(57) [Claims] 1. A pseudo-sunlight irradiation apparatus in which a mounting means for mounting a test material and a xenon lamp are relatively rotated about a tube axis of the xenon lamp, wherein the mounting means and the xenon lamp are connected to each other. A pseudo solar radiation, comprising: a liquid filter configured by filling a solution containing metal ions into a transparent container, wherein the xenon lamp light transmitted through the liquid filter is converted into pseudo sunlight. apparatus. 2. The apparatus according to claim 1, further comprising: a plurality of incandescent filament lamps, which are rotatable about the tube axis of the xenon lamp relative to the mounting means, between the mounting means and the xenon lamp, and which pass through the liquid filter. 2. The simulated light according to claim 1, wherein irradiation light from a plurality of incandescent filament lamps is sequentially superimposed and mixed on the xenon lamp light, and the chronologically integrated light of both lights is simulated sunlight. Solar irradiation device. 3. The apparatus according to claim 1, further comprising control means for controlling at least one of a voltage, a current and a frequency of at least one of said plurality of incandescent filament lamps. 2
Item 4. The pseudo-sunlight irradiator according to the above item. 4. The simulated sunlight according to claim 3, further comprising temperature detecting means for detecting a temperature of the test material, wherein said control means performs control according to the detected temperature. Irradiation device. 5. The control means controls at least one of a voltage, a current and a frequency of the incandescent filament lamp.
5. The simulated sunlight irradiation device according to claim 3, wherein the pseudo sunlight irradiation device is changed in a time-division manner. 6. A pseudo-solution according to claim 1, wherein said solution containing metal ions is one of an aqueous solution of copper sulfate and an aqueous solution of iron sulfate. Solar irradiation device. 7. The apparatus according to claim 1, wherein the mounting means and the xenon lamp are provided between
7. The simulated sunlight irradiation apparatus according to claim 1, further comprising an ultraviolet filter. 8. The simulated sunlight irradiation apparatus according to claim 1, wherein a spectrum distribution correction filter is provided in said liquid filter. 9. The pseudo solar cell according to claim 1, wherein a film for correcting spectral distribution is deposited on a surface of the transparent container constituting said liquid filter. Light irradiation device. 10. The simulated sunlight according to claim 1, wherein the transparent container constituting the liquid filter is constituted by a spectrum distribution correcting glass filter. Irradiation device. 11. A method for adjusting the spectrum of a simulated sunlight irradiating apparatus according to claim 1, wherein the spectrum of said simulated sunlight is adjusted by adjusting the concentration of said metal ions. How to adjust the spectrum of sunlight. 12. The method for adjusting a spectrum of a simulated sunlight irradiating apparatus according to claim 3 or 4, wherein the spectrum of the simulated sunlight is adjusted by adjusting a concentration of the metal ion and the plurality of the simulated sunlight. A method for adjusting the spectrum of simulated sunlight, wherein the method is performed by at least one of adjusting the spectrum distribution of at least one of the incandescent filament lamps. 13. The incandescent filament lamp according to claim 12, wherein the spectral distribution adjustment of the incandescent filament lamp is performed by controlling at least one of a voltage, a current, and a frequency of the incandescent filament lamp. How to adjust the spectrum of simulated sunlight.