JP4470327B2 - Pressure detection sheet and pressure detection method and apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure detection sheet in which pressure detection accuracy is enhanced by uniformly exciting a pressure-sensitive paint when pressure is detected using the pressure-sensitive paint, and a pressure detection method and apparatus using the same. It is.
[0002]
[Prior art]
In recent years, a pressure detection method using a pressure sensitive paint (PSP = Pressure Sensitive Paint) is known. A pressure-sensitive paint emits blue to red phosphorescence together with fluorescence when it is irradiated with ultraviolet to blue excitation light to a certain type of pigment. This phosphorescence is deactivated by collision with oxygen (oxygen absorbs the energy of phosphorescence), and the intensity of phosphorescence decreases. Therefore, when air pressure acts on the pressure-sensitive paint, the partial pressure of oxygen in the air rises corresponding to the pressure, thereby increasing the deactivation of phosphorescence due to oxygen and lowering the phosphorescence intensity. That is, since the phosphorescence intensity decreases and darkens when the pressure increases, the pressure is detected using this action.
[0003]
FIG. 3 shows an example of a pressure detection device that detects pressure using the pressure-sensitive paint. In FIG. 3, the specimen 2 to which the pressure-sensitive paint 1 is applied is installed inside a wind tunnel 3 through which air flows. Further, outside the wind tunnel 3, an irradiation device including a light source 4 that generates excitation light and a bandpass filter 6 a that introduces the excitation light from the light source 4 and passes only the excitation light 5 having a predetermined wavelength. 7, and the excitation light 5 from the irradiation device 7 is irradiated from the window 8 provided in the wind tunnel 3 toward the pressure-sensitive paint 1 applied on the specimen 2. A laser, a discharge lamp (such as a mercury lamp or a xenon lamp), a halogen lamp, a light emitting diode (LED), or the like is used as the light source 4 of the excitation light 5 irradiated by the irradiation device 7.
[0004]
The pressure-sensitive paint 1 irradiated with the excitation light 5 is excited as described above to generate phosphorescence. A measuring device 9 is installed outside the wind tunnel 3 to detect the phosphorescence from the pressure-sensitive paint 1 through a band-pass filter 6b that cuts the excitation light 5. As the measuring device 9, a point sensor such as a photomultiplier tube (PMT) or a silicon diode, an image sensor such as a CCD camera, or the like can be used. The most common is a CCD camera.
[0005]
Furthermore, a measurement signal from the measuring device 9 that measures the phosphorescence intensity is input to an arithmetic controller 10 such as a computer, and the intensity and pressure of phosphorescence emitted from the pressure-sensitive paint 1 obtained in advance are calculated. From the relationship, the pressure acting on the specimen 2 is detected by calculation.
[0006]
According to the pressure detection method using the pressure sensitive paint 1 as described above, the pressure (static pressure) acting on the surface of the specimen 2 can be detected.
[0007]
[Problems to be solved by the invention]
However, the conventional pressure detection device shown in FIG. 3 has the following problems.
[0008]
That is, in order to detect the pressure, it is necessary to measure the phosphorescence emitted from the pressure-sensitive paint 1 while irradiating the pressure-sensitive paint 1 with the excitation light 5, and the laser, the discharge lamp, the halogen lamp, Excitation light 5 from a point light source such as a light emitting diode causes uneven irradiation. That is, the intensity of the excitation light 5 irradiated by the point light source is different between the center and the periphery thereof, and such irradiation unevenness directly affects the intensity of phosphorescence, and therefore pressure cannot be detected with high accuracy. .
[0009]
Furthermore, even when trying to make the intensity of the excitation light uniform by arranging a large number of point light sources in close proximity, the intensity of the excitation light varies depending on the performance of each point light source. For this reason, various methods for making the intensity of the excitation light of each point light source uniform are also considered, but adjustment for making it uniform is very difficult, and each point light source requires a power cord. This makes the device very complex and makes the device very expensive.
[0010]
Further, in the pressure detection device of FIG. 3, the excitation light is irradiated from the surface side of the pressure sensitive paint 1 and simultaneously the phosphorescence from the pressure sensitive paint 1 is measured. It is necessary to arrange the irradiation device 7 having a complicated structure so as to be opposed to each other and to install a measuring device 9. Therefore, when detecting the pressure of the specimen 2 in the wind tunnel 3 as shown in FIG. Can be applied, but it is difficult to detect the pressure acting on the wall surface of a moving object such as an airplane or automobile. Moreover, in order to detect pressure, the troublesome operation | work of apply | coating the pressure sensitive coating material 1 to the test body 2 each time is required, For this reason, detection work efficiency will also fall.
[0011]
Furthermore, it has a problem that it is difficult to apply to a specimen having a complicated shape and it is difficult to uniformly apply a pressure-sensitive paint.
[0012]
The present invention has been made in order to solve the problems of the conventional apparatus, and a pressure detection sheet that can enhance pressure detection accuracy by exciting a pressure-sensitive paint uniformly by a simple method, and An object of the present invention is to provide a pressure detection method and apparatus using the same.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 comprises layers in the order of a surface transparent electrode, a light emitting layer, an insulating layer, a back electrode, and a back protective layer , and energizes the surface transparent electrode and the back electrode to emit excitation light by the light emitting layer. the upper surface of the way that the electroluminescent sheet wherein the surface transparent electrode, to form a pressure sensitive paint layer was uniformly applied to pressure-sensitive paint, against the back of the excitation light of the light emitting layer to the pressure sensitive paint layer The pressure detection sheet is characterized in that phosphorescence corresponding to the air pressure acting on the pressure-sensitive paint layer is generated from the pressure-sensitive paint layer by exciting the pressure-sensitive paint layer .
[0014]
The invention according to claim 2 is the pressure detection sheet according to claim 1, wherein an adhesive layer is provided on the back surface of the back surface protective layer of the pressure detection sheet.
[0015]
According to a third aspect of the present invention, the back surface of the pressure detection sheet according to the first or second aspect is fixed to a detection target, and the surface transparent electrode and the rear electrode of the pressure detection sheet are energized to sense the excitation light of the light emitting layer . Phosphorescence is generated by applying pressure to the pressure paint layer from the back to excite the pressure sensitive paint , and it changes by colliding with oxygen due to oxygen partial pressure corresponding to the air pressure acting on the pressure sensitive paint layer and deactivating. by measuring the intensity of light, which is a pressure detecting method and detecting the air pressure acting on the object to be detected from the intensity of the phosphorescence.
[0016]
According to a fourth aspect of the present invention, the pressure detection sheet according to the first or second aspect and the surface transparent electrode and the rear electrode of the pressure detection sheet are energized to transmit excitation light from the light emitting layer to the pressure sensitive paint layer from the rear side. A power supply device that generates phosphorescence by applying pressure to the pressure-sensitive paint layer, and a measuring device that measures the intensity of phosphorescence from the pressure-sensitive paint layer that changes according to the air pressure acting on the pressure-sensitive paint layer ; a pressure detecting device is characterized in that and a calculation control unit that detects the air pressure acting on the pressure-sensitive paint layer from the intensity of the phosphorescence was measured by the measuring device.
[0017]
The present invention operates as follows.
[0018]
In the present invention, the pressure sensing sheet is formed by uniformly applying the pressure sensitive paint on the upper surface of the surface transparent electrode of the electroluminescent sheet to form the pressure sensitive paint layer. The pressure-sensitive paint can be excited uniformly from the back to generate uniform phosphorescence, so that there is no uneven irradiation as in the past, thus enabling pressure detection with high accuracy. Become.
[0019]
Furthermore, the pressure detection sheet has a simple structure, and it only needs to be attached and fixed to the detection target. There is no need to apply pressure-sensitive paint to the detection target, and excitation is performed from the back of the pressure-sensitive coating layer. Since light can be easily and uniformly excited, it can be easily applied to the wall surface of a moving object such as an airplane or an automobile, and the pressure acting on the wall surface can be detected with high accuracy.
[0020]
Furthermore, since the pressure detection sheet can be cut into an arbitrary shape and fixed even to a detection object having a complicated shape, it is excellent in convenience and the application range can be greatly expanded.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0022]
FIG. 2 is a conventionally known electroluminescent sheet. The electroluminescent sheet 11 is obtained by laminating a surface transparent electrode 12, a light emitting layer 13, an insulating layer 14, a back electrode 15, and a back protective layer 16 and integrating them in a sheet shape. A power supply circuit 17 connected to a power source is connected to the transparent electrode 12 and the back electrode 15.
[0023]
When the electroluminescent sheet 11 is energized to the surface transparent electrode 12 and the back electrode 15 by the power supply circuit 17, the light emitting layer 13 emits light uniformly in the surface direction, and the emitted light is transmitted through the surface transparent electrode 12 and Uniform injection from the top surface. The electroluminescent sheet 11 can uniformly emit the ultraviolet to blue excitation light 18 by selecting the material of the light emitting layer 13.
[0024]
FIG. 1 is a schematic side view showing an embodiment of the present invention using the electroluminescent sheet 11 of FIG. In FIG. 1, the same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0025]
As shown in FIG. 1, a pressure-sensitive paint layer 19 is formed by uniformly applying a pressure-sensitive paint on the upper surface of the surface transparent electrode 12 of the electroluminescent sheet 11 to obtain a pressure detection sheet 20. As a method for applying the pressure-sensitive paint on the surface transparent electrode 12, an air brush (such as a piece container for model coating) is used, and as a simple method, a spin coating method, an immersion method, or the like is used. it can. At this time, since the surface transparent electrode 12 is generally formed of a resin material, the adhesion of the pressure sensitive paint is good, and the surface of the surface transparent electrode 12 is smooth, so that the pressure sensitive paint has a uniform thickness. Application at this time is relatively easy. At this time, the thickness of the pressure-sensitive paint layer 19 is preferably several microns to several tens of microns.
[0026]
An adhesive layer 21 is formed on the back surface of the pressure detection sheet 20 (the lower surface of the back surface protective layer 16) by applying an adhesive, and the pressure detection sheet 20 is detected via the adhesive layer 21. It fixes to the wall surface of 22. The adhesive layer 21 may be formed by coating when the pressure detection sheet 20 is used. Alternatively, the adhesive layer 21 is previously formed on the back surface of the pressure detection sheet 20 and a release tape is applied to the back surface. In addition, the peeling tape may be peeled off during use.
[0027]
Further, as in FIG. 3, a measuring device 9 for measuring the intensity of phosphorescence is provided so as to face the pressure-sensitive paint layer 19. Then, the measurement signal measured by the measuring device 9 is input to the arithmetic controller 10 such as a computer, and the arithmetic controller 10 calculates the pressure acting on the detection target 22. The arithmetic controller 10 controls the power supply circuit 17 of the pressure detection sheet 20, for example, adjusts the light emission intensity of the pressure detection sheet 20.
[0028]
The operation of the above embodiment will be described below.
[0029]
In the embodiment shown in FIG. 1, an adhesive is applied to the back surface of the pressure detection sheet 20 having the required size (area) (the lower surface of the back protective layer 16), and the pressure detection is performed via the adhesive layer 21. The sheet 20 is fixed to the wall surface of the detection object 22. At this time, the pressure detection sheet 20 having a required area is prepared, and the pressure detection sheet 20 can be cut and used according to the shape of the detection target 22, the required detection area, and the like.
[0030]
When the power supply circuit 17 is operated to energize the surface transparent electrode 12 and the back electrode 15, the light emitting layer 13 emits light uniformly, and the emitted excitation light 18 is transmitted through the surface transparent electrode 12 and uniformly from the upper surface. It is injected.
[0031]
At this time, since the pressure-sensitive paint layer 19 is formed on the upper surface of the surface transparent electrode 12, the dye of the pressure-sensitive paint is excited by the excitation light 18 from the light emitting layer 13 and generates uniform phosphorescence in the surface direction. It becomes like this.
[0032]
Therefore, when pressure is applied to the pressure-sensitive paint layer 19 and the detection object 22, the phosphorescence intensity changes in response to the partial pressure of oxygen due to the change in pressure, and the phosphorescence intensity. Is measured by the measuring device 9, and the measurement signal is input to the arithmetic controller 10, and the detection target is determined based on the relationship between the intensity of phosphorescence emitted from the pressure-sensitive paint layer 19 and the pressure obtained in advance. The pressure acting on the object 22 is detected by calculation.
[0033]
As described above, according to the pressure detection sheet 20, it is possible to uniformly irradiate the excitation light 18 from the back surface of the pressure-sensitive paint layer 19 and uniformly excite it, so that there is no uneven irradiation as in the prior art. It is possible to detect the pressure with high accuracy.
[0034]
Furthermore, since the pressure detection sheet 20 has a simple structure and can excite the pressure-sensitive paint layer 19 simply by being attached to and fixed to the detection target 22, it can be easily applied to the wall of a moving object such as an airplane or an automobile. It is possible to detect the pressure applied to the wall surface after mounting.
[0035]
Furthermore, since the pressure detection sheet 20 can be easily cut into an arbitrary shape and used for the detection target 22 having a complicated shape, the convenience is improved, and thus the application range is greatly increased. Can be expanded.
[0036]
It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
[0037]
【The invention's effect】
According to the present invention, since the pressure detection sheet is formed by uniformly applying the pressure sensitive paint to the upper surface of the surface transparent electrode of the electroluminescent sheet, the pressure detection sheet is formed more uniformly. Excitation light is generated to excite the pressure-sensitive paint uniformly from the back surface, and uniform phosphorescence can be generated, so that there is no uneven irradiation as in the prior art, so pressure detection with high accuracy is possible. There is an effect that becomes possible.
[0038]
Furthermore, the pressure detection sheet has a simple structure, and it only needs to be attached and fixed to the detection target. There is no need to apply pressure-sensitive paint to the detection target, and excitation is performed from the back of the pressure-sensitive coating layer. Since the light can be easily and uniformly excited, it can be easily applied to the wall surface of a moving object such as an airplane or an automobile, and the pressure acting on the wall surface can be accurately detected.
[0039]
Furthermore, since the pressure detection sheet can be cut into an arbitrary shape and fixed even on a detection object having a complicated shape, it is excellent in convenience and has the effect of greatly expanding the application range.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of the present invention.
FIG. 2 is a side view of an electroluminescent sheet used in the present invention.
FIG. 3 is a schematic side view showing an example of a conventional pressure detection device using a pressure-sensitive paint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 9 Measuring apparatus 10 Operation controller 11 Electroluminescent sheet 12 Surface transparent electrode 13 Light emitting layer 14 Insulating layer 15 Back electrode 16 Back surface protection layer 17 Power supply circuit 18 Excitation light 19 Pressure sensitive paint layer 20 Pressure detection sheet 21 Adhesive layer 22 Object to be detected

Claims (4)

Electroluminescent that consists of a surface transparent electrode, a light emitting layer, an insulating layer, a back electrode, and a back protective layer in this order, and energizes the transparent surface electrode and the back electrode to emit excitation light. the upper surface of the front transparent electrode sheet, by forming a pressure-sensitive paint layer was uniformly applied to pressure-sensitive paint, excited by applying from the back of the excitation light of the light emitting layer to the pressure-sensitive paint layer, a pressure-sensitive A pressure detection sheet characterized in that phosphorescence corresponding to air pressure acting on a paint layer is generated from the pressure-sensitive paint layer .   The pressure detection sheet according to claim 1, wherein an adhesive layer is provided on the back surface of the back surface protection layer of the pressure detection sheet. The back surface of the pressure detection sheet according to claim 1 or 2 is fixed to a detection object, and the surface transparent electrode and the back electrode of the pressure detection sheet are energized so that the excitation light of the light emitting layer is applied to the pressure sensitive paint layer from the back surface. By measuring the intensity of phosphorescence that changes by exciting phosphoric acid by exciting the pressure-sensitive paint and colliding with oxygen due to oxygen partial pressure corresponding to the air pressure acting on the pressure-sensitive paint layer pressure detection method characterized by detecting the air pressure acting on the object to be detected from the intensity of the phosphorescence. The pressure detection sheet according to claim 1 or 2, and the surface transparent electrode and the back electrode of the pressure detection sheet are energized to apply excitation light from the light emitting layer to the pressure sensitive paint layer from the back side to excite the pressure sensitive paint layer. A power supply device that generates phosphorescence, a measurement device that measures the intensity of phosphorescence from the pressure-sensitive paint layer that changes according to the air pressure acting on the pressure-sensitive paint layer, and phosphorescence measured by the measurement device pressure detector for the intensity of the arithmetic and control unit for detecting the air pressure acting on the pressure-sensitive paint layer, comprising the.

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