JP2010251387A - Solar simulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar simulator for correctly measuring a light amount concerning the light to be radiated to a surface to be irradiated and preventing the loss of light to be radiated to the surface to be irradiated. <P>SOLUTION: The solar simulator (1) includes: a lamp (3) for emitting artificial solar light; and an optical system (7) for guiding the artificial solar light to the surface (5) to be irradiated. The optical system includes a reflection board (15) for reflecting the artificial solar light toward the surface (5) to be irradiated. The reflection board has a lighting window (17) arranged in the reflection board. The lighting window permits the passage of the partial light to be made incident to the reflection board (15). The light passing the lighting window (17) is used for measuring the light amount. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solar simulator for generating light similar to sunlight (pseudo sunlight) used for inspecting the performance of solar cells to evaluate their performance.

  The solar simulator includes a lamp that emits pseudo-sunlight and an optical system that guides light emitted from the lamp to an irradiated surface on which a light receiving surface of a solar cell to be inspected is arranged. The amount of light (radiated light) emitted from the lamp is adjusted while passing through the optical system, and reaches the irradiated surface. For adjusting the amount of light, for example, a part of the light passing through the optical system is taken out and the light intensity is measured, and the measured value is reflected in the output of the lamp by feedback control, for example, or reflected in the optical aperture mechanism. Is done.

  Conventionally, it has been proposed that a translucent plate be attached to the output end face of a light guide (light guide for illumination) that constitutes the optical system in order to extract a part of the emitted light for light quantity measurement (Patent Document 1). ). According to this proposal, the light that has reached the output end face of the illumination light guide is branched into one that irradiates the irradiated surface and one that is used for light quantity measurement via the translucent plate. Measurement light used for light quantity measurement is sent to an optical sensor via another light guide (monitoring light guide), and its light intensity is measured.

  By the way, the solar simulator is continued to be used by replacing the optical components constituting the solar simulator with the passage of time. In the conventional solar simulator, when the light transmitting plate or the monitor light guide, which is an optical component, is replaced, these light transmittances are caused by variations in component quality before and after replacement, displacement of the mounting position, and the like. There is a problem that a change occurs in the light quantity, and this change hinders accurate measurement of the light amount. Furthermore, the light for irradiating the irradiated surface is radiated into the air through the light transmitting plate, and between the output end surface of the illumination light guide and the light transmitting plate attached thereto. Since there is an air layer having a refractive index different from that of the light transmitting plate, light emitted from the output end face of the illumination light guide is incident on the air layer and the light transmitting plate, and the light transmitting plate. When they are radiated from the sky, some of them will be reflected. For this reason, there exists a problem of causing the loss of the light irradiated to the said to-be-irradiated surface.

JP 2007-42383 A

  An object of the present invention is to provide a solar simulator that can more accurately measure the amount of light with respect to light irradiated on an irradiated surface. Another object of the present invention is to provide a solar simulator that does not cause a loss in the light irradiated on the irradiated surface.

(Characteristics of the invention described in claim 1)
The invention according to claim 1 relates to a solar simulator, and includes a lamp that emits light that approximates sunlight, and an optical system that guides light emitted by the lamp to an irradiated surface, wherein the optical system includes A reflection plate for reflecting light toward the irradiated surface, the reflection plate being a daylighting window provided on the reflection plate and used for measuring the amount of light incident on the reflection plate; It is characterized by having a daylighting window that allows passage of part of the light.

  In the first aspect of the present invention, the means for taking out a part of the light (measurement light) used for measuring the amount of light emitted from the lamp and incident on the reflection plate is the reflection. It consists of a daylighting window provided on the plate. The daylighting window consists of a space filled with air, and the light transmittance of the air in the space does not change with the replacement of the reflector, which is an optical component that defines the daylighting window (the slight variation in air is also small). But it is negligibly small compared to the variation in component quality). From this, it is possible to avoid a change in the measurement value due to a change in the light transmittance, and thereby it is possible to perform the light amount measurement and the light control based on the measurement value more accurately.

  Further, the daylighting window provided on the reflection plate does not exist in the traveling path of the light (irradiation light) reflected by the reflection plate (the light that is incident on the reflection plate is allowed to pass and is reflected light). Therefore, the irradiation light, that is, the reflected light directed to the irradiated surface is not affected by the loss.

  Further, since the daylighting window is formed at the reflecting plate that directly reflects the light toward the irradiated surface, the light used for measuring the amount of light is light immediately before entering the irradiated surface. This substantially corresponds to the incident light on the irradiated surface.

(Features of the invention described in claim 2)
According to a second aspect of the present invention, in addition to the constituent elements of the first aspect of the invention, the daylighting window has an axis parallel to the optical axis.

  According to the invention described in claim 2, by setting the axis of the daylighting window, which is a light guide hole, to be parallel to the optical axis, compared to the case of setting it non-parallel, It is possible to reduce the reflection of light on the peripheral wall surface, thereby reducing the attenuation of light passing through the daylighting window.

(Characteristics of the invention described in claim 3)
The invention according to claim 3 comprises the component of the invention according to claim 1 or 2, wherein the optical system reflects the light toward the reflector, and It is provided with the lens for arrange | positioning the surface illuminance of the said light arrange | positioned between a reflecting plate and the said reflective mirror.

  According to the invention described in claim 3, since the light emitted from the lamp is incident on the reflector in a state where the light is passed through the lens by the reflection by the reflector and the surface illuminance thereof is made uniform. The light extracted from the daylighting window of the reflector can be the same as the light reaching the irradiated surface.

(Characteristic of the invention described in claim 4)
The invention according to claim 4 comprises the components of the invention according to claim 3, and the optical system is arranged between the reflecting mirror and the lens to provide a light quantity for the light. A diaphragm mechanism for adjusting is provided.

  According to the fourth aspect of the present invention, the light emitted from the lamp is operated by operating the aperture mechanism based on the magnitude of the measurement value of the light amount emitted from the daylighting window of the reflector. The amount of light can be reduced and returned to the amount before the reduction, whereby the amount of light with respect to the light that reaches the reflector and is reflected from the reflector to the irradiated surface can be adjusted.

(Characteristics of the invention described in claim 5)
The invention according to claim 5 includes the components of the invention according to any one of claims 1 to 3, and further sets the light quantity value for the light that has passed through the daylighting window of the reflector. And a feedback control mechanism for adjusting the output of the lamp.

  According to the fifth aspect of the present invention, the output of the lamp is adjusted by inputting the measured value of the light amount of the light that has passed through the daylighting window of the reflector to the feedback control mechanism, and the irradiated surface It is possible to adjust the amount of light with respect to the light.

(Characteristic of the invention described in claim 6)
The invention according to claim 6 comprises the components of the invention according to claim 4, and further controls the aperture mechanism based on the value of the amount of light with respect to the light passing through the daylighting window of the reflector. Including a feedback control mechanism.

  According to the sixth aspect of the present invention, the diaphragm mechanism is controlled by inputting the measured value of the light amount of the light that has passed through the daylighting window of the reflecting plate to the feedback control mechanism, so that the surface to be irradiated is irradiated. It is possible to adjust the amount of light with which the light is directed.

  ADVANTAGE OF THE INVENTION According to this invention, the measurement of the light quantity about the pseudo sunlight irradiated to the light-receiving surface of the solar cell which is a test object can be performed more correctly about a solar simulator. Moreover, the fall of the light quantity about the pseudo-sunlight irradiated to the said to-be-irradiated surface can be suppressed.

It is a conceptual diagram of the solar simulator which concerns on this invention. It is an enlarged view which shows notionally the reflecting plate in the solar simulator, its lighting window, the optical sensor, and the light diffusing plate. It is a circuit diagram of the feedback control mechanism in a solar simulator. It is a graph which shows the relationship between the lamp output and control input in the lamp driver of a control mechanism. It is a conceptual diagram of a solar simulator including an aperture mechanism.

  Referring to FIG. 1, an overview of a solar simulator according to the present invention is indicated generally by the reference numeral 1. The solar simulator 1 includes a lamp 3 that emits radiated light (pseudo-sunlight) L that approximates sunlight, and an optical that guides the light (radiated light) L emitted from the lamp 3 to an irradiated surface 5 that is a virtual plane. System 7. The light receiving surface is placed on the irradiated surface 5 in the performance test of a solar cell (not shown) for converting solar energy into electric energy.

  The illustrated lamp 3 is a discharge lamp. The discharge lamp has a quartz glass tube 9 filled with a rare gas such as xenon, and an anode 11 and a cathode 13 disposed at both ends of the quartz glass tube 9. By applying a voltage to the electrodes 11 and 13, arc discharge is generated between the electrodes 11 and 13, and this emits the radiated light L which is the above-described pseudo sun. The amount of light emitted from the lamp 3 with respect to the radiated light L is proportional to the amount of power applied to the electrodes 11 and 13. The lamp 3 can be a filament bulb such as a halogen lamp, for example, instead of the discharge lamp.

  The optical system 7 for guiding the radiated light L of the lamp 3 to the irradiated surface 5 includes a reflector 15 for receiving the radiated light L and reflecting it toward the irradiated surface 5. The reflection plate 15 is made of, for example, a rectangular glass plate having one surface of the vapor deposition layer of the optical reflection material as a reflection surface. In the example shown in FIG. 1, the reflecting plate 15 is arranged so that the radiated light L is reflected at a reflection angle of 90 degrees.

  The reflecting plate 15 is provided with a daylighting window 17 which is a non-sealed space filled with air that allows a part of the radiated light L incident thereon to pass therethrough. A part L1 of the radiated light L that has passed through the daylighting window 17 is used to measure the amount of light with respect to the incident light L incident on the reflector 15 (hereinafter, “part of the radiated light L1” is referred to as “measurement light L1” "). On the other hand, the remaining part L2 of the radiated light L reflected by the reflecting plate 15 reaches the irradiated surface 5 and irradiates the irradiated surface (hereinafter referred to as “irradiated part L2 of the radiated light”). "Light L2"). Therefore, the measurement light L1 and the irradiation light L2 have the same light quantity, and the value of the light quantity obtained by measuring the measurement light L1 is equal to that of the irradiation light L2.

  Further, as described above, the daylighting window 17 is provided in the reflecting plate 15 itself and does not exist in the traveling path of the irradiation light L2. For this reason, the daylighting window 17 does not have an adverse effect on the irradiation light L2 such that a loss occurs in this.

  It is desirable that the daylighting window 17 has such a size that the extraction of the measurement light L1 from the radiated light L through it does not cause “irradiance unevenness of irradiance” (JIS C8912) on the radiated surface 5. From this point of view, the daylighting window 17 can be a circular hole having a diameter of 2 mm, for example. Moreover, the cross-sectional shape of the daylighting window 17 is not limited to a circle, but may be any other shape such as a polygon or an ellipse. Furthermore, although the lighting window 17 in this embodiment is provided in the center part of the reflecting plate 15 as shown in FIG. 2, it can be provided in the arbitrary places in the range which the light is shining so that it may mention later. .

  As in the example shown in FIG. 1, the daylighting window 17 is preferably positioned so that its axis is parallel to the optical axis l, specifically, an extension of the optical axis l. According to this, the measurement light L1 that has entered the daylighting window 17 can go straight along the axis of the daylighting window 17, and the wall surface of the daylighting window that occurs when the daylighting window is not parallel to the optical axis l. It is possible to avoid reflection on the (circumferential wall) and attenuation associated therewith.

  An optical sensor 19 for detecting the measurement light L1 and converting it to a voltage corresponding to the amount of light for the measurement light is disposed on the side opposite to the reflection surface of the reflection plate 15. The optical sensor 19 can be made of, for example, a silicon photodiode that is sensitive to the sunlight spectrum. The light sensor 19 is preferably arranged on an extension of the axis of the lighting window 17.

  In the example shown in FIGS. 1 and 2, the measurement light L <b> 1 emitted from the daylighting window 17 is received between the reflector 15 that defines the daylighting window 17 and the optical sensor 19, and this is supplied to the optical sensor 19. A diffusion plate 21 having a function of diffusing toward the surface is disposed. According to this, since the light reaching the optical sensor 19 is diffused light, the optical sensor 19 can detect the measurement light L2 even if there is a slight error in the arrangement position of the optical sensor 19 and the angle of the light receiving surface. can do.

  The daylighting window 17 in the present embodiment is configured by the through-hole penetrating the reflector 15 in the thickness direction as described above. However, by adopting the following configuration, the function approximates the function and effect of the daylighting window 17. An effect can be produced. First, as a first configuration, the entire reflector body (not shown) or the periphery of the lighting window is made of a transparent member such as a transparent synthetic resin or glass, and one surface of the reflector body. An optical reflective material layer is formed by vapor deposition or the like. Here, if a part of the optical reflective material layer is lost (omitted) to expose the reflector main body, the exposed portion can be used as a daylighting window. Since it is not reflected if it is an exposed part, light passes through the exposed part further through the reflector main body and reaches the back side of the reflector main body. As a second configuration, instead of the above-described defect, the defect part may be a so-called half mirror part to ensure translucency. As a final third configuration, the through-hole can be used as an attachment hole, and an optical sensor can be directly embedded therein. According to the said 3rd structure, since the light-receiving surface of an optical sensor receives light directly, it can anticipate the effect similar to that of this embodiment.

  The optical system 7 is further used to make the irradiation light L2 reaching the irradiated surface 15 have a uniform illuminance on the irradiated surface 15, that is, to make the surface illuminance of the radiated light L uniform. It is desirable to include, for example, a fly-eye lens 23 which is an optical component.

  In the example shown in FIG. 1, the fly-eye lens 23 is arranged so that the radiated light L having passed through the fly-eye lens 23 enters the reflection plate 15. The fly-eye lens 23 can be disposed between the reflector 15 and the irradiated surface 5, but the solar simulator 1 can be used by placing the fly-eye lens 23 between the lamp 3 and the reflector 15 as illustrated. Regardless of the difference in the transmittance of the fly-eye lens before and after replacement when the fly-eye lens 23 that has deteriorated with time during the period is replaced, the measurement light L1 that passes through the daylighting window 17 in the center of the reflector 15; It is avoided that a change in the amount of light occurs between the irradiation light L2 reaching the irradiated surface 5. Further, since the light irradiated to the reflector 15 has a uniform illuminance through the fly-eye lens 23, the daylighting window 17 can be provided at any location within the same range including the central portion of the irradiation range. There is an effect.

  Further, in the present embodiment, in order to guide the radiated light L of the lamp 9 to the fly-eye lens 23, a reflecting mirror 25 similar to the reflecting plate 17 is disposed. The reflecting mirror 25 forms part of the optical system 7. The light L emitted from the lamp 9 is reflected toward the reflection plate 17 at a reflection angle of 90 degrees by the reflecting mirror 25 that has received the light L. The light L reflected by the reflecting mirror 25 reaches the reflecting plate 15 through the fly-eye lens 23. Note that the reflecting mirror 25 is not an essential component in the present invention, and the reflecting mirror 25 may be omitted as a mechanism for causing the light from the lamp 9 and the condenser mirror 27 to directly enter the fly-eye lens 23.

  In the illustrated example, a condensing mirror 27 for collecting the light L emitted from the lamp 3 and guiding it to the reflecting mirror 25 is disposed. The condenser mirror 27 has a reflecting surface formed of a hemispherical surface surrounding a part of the lamp 9. The illustrated condensing mirror 27 is made of a glass material, and an optical reflecting material is deposited on its hemispherical surface to make it a reflecting surface. According to this, the light L emitted from the lamp 3 is collected in the hemispherical reflecting surface of the condensing mirror 27 and reflected toward the reflecting mirror 25 on the reflecting surface. The condensing mirror 27 is positioned so that the light L reflected by the reflecting mirror 25 is condensed on the fly-eye lens 23. The condenser mirror 27 also forms part of the optical system 7.

  Further, as a part of the optical system 7, it is desirable to arrange a lens for making the irradiation light L2 incident on the irradiated surface 5 parallel. In the example shown in FIG. 1, two lenses 29 and 31 are arranged at a distance from each other between the fly-eye lens 23 and the reflecting mirror 15, and one collimation lens 33 is irradiated with the reflecting plate 15. It is arranged between the surface 5. These lenses 29, 31, and 33 work together so that the irradiation light L <b> 2 that is the light that has passed through these lenses 29, 31, and 33 is parallel light.

  The electrical signal (voltage) relating to the light quantity of the measurement light L1 emitted from the daylighting window 17 of the reflecting plate 15 and detected by the optical sensor 19 adjusts the output of the lamp 3 or drives the optical aperture mechanism. Can be used as a feedback signal.

  Referring to FIG. 3, an example of a feedback control mechanism for performing the output adjustment of the lamp 3 is generally indicated by reference numeral 35. The feedback control mechanism 35 includes an operational amplifier 37 which is an electric circuit called an operational amplifier, and a lamp driver 39 electrically connected thereto.

  The operational amplifier 37 includes a positive input terminal 41, a negative input terminal 43, and an output terminal 45, and both the input terminals 41 and 43 and the output terminal 45 are electrically connected to the arithmetic element 47, respectively. The arithmetic element 47 compares two input voltages applied to the input terminals 41 and 43, respectively. If the input voltage to the positive input terminal 41 is higher than the input voltage to the negative input terminal 43, the voltage of the output terminal 45 is calculated. On the contrary, if it is low, decrease the voltage.

  The optical sensor 19 is electrically connected to the negative input terminal 43 of the operational amplifier 37 through an amplifier 49. The amplifier 49 amplifies the voltage, which is an electrical signal generated by the optical sensor 19, to a magnitude suitable for the operation of the operational amplifier 37.

  Further, the positive input terminal 41 of the operational amplifier 37 is electrically connected to a volume 51 that is an electrical component called a variable resistor. The volume 51 generates a control voltage that is an operation reference of the operational amplifier 37. The volume 51 is provided with a knob (not shown) for manually operating the volume 51. The operator can adjust the magnitude of the control voltage by operating the knob.

  The lamp driver 39 is an electric circuit for driving the lamp 3 and includes a control input terminal 53, a positive output terminal 55, and a negative output terminal 57. The control input terminal 53 is electrically connected to the output terminal 45 of the operational amplifier 37, and the voltage output to the output terminal 45 of the operational amplifier 37 is applied to the control input terminal 53. Further, the positive output terminal 55 and the negative output terminal 57 are electrically connected to the positive electrode 11 and the negative electrode 13 of the lamp 3, respectively. The lamp driver 39 generates a high voltage at the start of lighting of the lamp 3, starts discharge in the lamp 3, and performs constant power control of the lamp 3 according to the magnitude of the voltage applied to the control input terminal 53 after the start of discharge. Do.

  FIG. 4 is a graph showing an example of the relationship between the control input voltage and the output of the lamp 3. This graph shows that when the control input voltage changes in the range of 0 to 5V, the output of the lamp 3 changes in the range of 0 to 100% accordingly. However, in reality, when the output of the lamp 3 composed of a discharge lamp is lowered, the discharge may become unstable or stop, so that the control region is 70 to 100% of the output of the lamp 3. A range is desirable.

  The lamp 3 of the solar simulator 1 can be turned on by supplying power from the lamp driver 39. After the lamp 3 is turned on, the light amount of the irradiation light L2 for the irradiated surface 5 is set. For setting the light amount (dimming), for example, an illuminance meter is placed on the irradiated surface 5, and the volume 51 is operated so that the illuminance meter indicates a desired indication value, thereby the positive input terminal 41 of the operational amplifier 37. This can be done by adjusting the control pressure applied to. As described above, the value of the control pressure is compared with the value of the pressure from the optical sensor 19 in the operational amplifier 37. As a result, when the pressure value of the optical sensor 19 is lower than the control pressure value, that is, the irradiation to the irradiated surface 5 is performed. When the amount of light is lower than the set amount of light, the operational amplifier 37 increases its output voltage value, and vice versa. In response to this, the lamp driver 39 drives the lamp 3 so that its output increases or decreases.

  The amount of irradiation light decreases due to deterioration of the lamp 3 with time, deterioration of transmittance and reflectance due to adhesion of dirt to the optical parts constituting the optical system 7, and the lamp, the optical parts, etc. Increased due to replacement with new one. The change in the irradiation light amount caused by the decrease or increase in the irradiation light amount can be adjusted by the feedback control mechanism 35 as described above, and the irradiation light amount can be set to a desired value.

  Instead of the output control of the lamp 3 by the lamp driver 39 in the above-described example, output control using, for example, a liquid crystal shutter (not shown) can be performed. The liquid crystal shutter can be disposed between the reflecting mirror 25 and the fly-eye lens 23 or between the fly-eye lens 23 and the reflecting plate 15. The liquid crystal shutter receives an electrical signal from the output terminal 45 of the operational amplifier 37 and changes its transmittance in the range of 0 to 100%. Due to this change, a change in the amount of light for the irradiation light L passing through the liquid crystal shutter is realized.

  In the above-described example, analog control by calculation performed by the operational amplifier 37 is used, but digital control using a computer circuit can be used instead. The computer circuit provided in the operational amplifier 37 includes, for example, a CPU (Central Processing Unit) that performs control and calculation, a ROM (Read Only Memory) that performs storage, a RAM (Random Access Memory), and an A / A that performs analog input. A D converter and a D / A converter that performs analog output are provided. In this computer circuit, the optical sensor 19 and the volume 51 are electrically connected to the A / D converter, and the D / A converter is electrically connected to the lamp driver 39. Analog electric signals from the optical sensor 19 and the volume 51 are converted into digital signals by an A / D converter and input to the CPU. The CPU compares the two signals, calculates the control voltage value applied to the control input terminal 53 of the lamp driver 39, and outputs the result to the D / A converter. The control voltage value converted into an analog electric signal by the D / A converter is applied to the control input terminal 53 to control the output of the lamp 3. The ROM stores a control program to be executed by the CPU, and the RAM has a work area when the CPU executes the program.

  Further, in the feedback control, a control method called proportional control or P control is used, but instead of this, a modern control method such as PID control or robust control can be adopted. In the feedback control mechanism 35 described above, the output voltage at the output terminal 45 of the operational amplifier 37 is increased depending on whether the control voltage input to the positive input terminal 41 of the operational amplifier 37 is higher or lower than the signal voltage from the optical sensor 19. Decide below. However, according to such proportional control, for example, when there is a characteristic that the change in the light emission amount of the lamp 3 is delayed with respect to the change in the voltage applied to the lamp 3, a disadvantage such as a vibration of the light emission amount occurs. There is a fear. In order to deal with such an inconvenience, for example, it is desirable to perform PID control in which P (proportional constant), I (integral constant), and D (differential constant) are set to preferable values.

  By the way, the light control can be mechanically performed using a diaphragm mechanism 61 as shown in FIG. 5 instead of electrically using the feedback control mechanism 35.

The aperture mechanism 61 includes a light control plate 63 and a shutter plate 65 which are a pair of discs facing each other.
The light control plate 63 is provided with a plurality of large-diameter holes 67 and a plurality of small-diameter holes 69 on the circumference of the disk, and the amount of light passing through the diaphragm mechanism 61 is determined according to the rotation angle position of the disk. By controlling it, it has a function of decreasing in steps from 100% (fully open) to 0% (light shielding). The shutter plate 65 has an opening 71 which is four holes of the same diameter arranged on a circle having an angle of 90 degrees on the disc and a center portion coinciding with the center of the optical axis of the fly-eye lens 23. Each has a light shielding portion disposed at an angle of 45 degrees from the opening 71, and has a function of passing and blocking light passing through the aperture mechanism 61 by controlling the rotational angle position of the disk.

  Both discs 63 and 65 are disposed between the reflecting mirror 25 and the fly-eye lens 23, and their axes are located on the optical axis. Here, the light control plate 63 faces the reflecting mirror 25, and the shutter plate 65 faces the fly-eye lens 23. Therefore, the radiated light L reflected by the reflecting mirror 25 enters the fly-eye lens 23 through the holes 67 and 69 of the light control plate 63 and the hole 71 of the shutter plate 65 in order.

  The dimming plate 63 and the shutter plate 65 have stepping motors 73 and 74 attached to the centers of the discs, respectively, and are supported so that they can be controlled separately by driving the stepping motors 73 and 74, respectively. Yes.

  The stepping motors 73 and 74 are electrically connected to the computer circuit 75, respectively. The computer circuit 75 includes a central processing unit (CPU) that performs control and calculation, a read only memory (ROM) that stores data, a random access memory (RAM), and an A / D converter that performs analog input. The optical sensor 19 and the volume 51 are electrically connected to the A / D converter of the computer circuit 75. Analog electric signals from the optical sensor 19 and the volume 51 are converted into digital signals by an A / D converter and input to the CPU. The CPU compares and calculates the two signals, and based on the result, outputs a drive signal including the rotation direction and rotation angle to each of the stepping motors 73 and 74 so as to obtain the desired amount of irradiation light L2. To emit. The ROM stores a control program to be executed by the CPU. Further, a work area when the CPU executes the program is developed in the RAM. In the above description, the operator manually operates the volume 51 to generate a control voltage as an operation reference. However, the computer circuit 75 is provided with operation means 77 including a digital display and an input operation switch, and the operator operates these. A value serving as an operation reference may be set. For example, when feedback control is performed so that the light energy of the irradiated surface 5 becomes 1 SUN (1000 W / square m), the operator operates an input operation switch such as a numeric keypad, and the target value is 1000 W on the digital display. The setting is made to be / m2. The computer circuit 75 performs control so that the light energy of the irradiated surface 5 becomes a target value. For example, a small computer circuit 75 such as a 1-chip CPU may be incorporated in the solar simulator. A personal computer or a sequencer may be used as the computer circuit 75.

DESCRIPTION OF SYMBOLS 1 Solar simulator 3 Lamp 5 Irradiated surface 7 Optical system 9 Quartz glass tube 11 Anode 13 Cathode 15 Reflector plate 17 Light collecting window 19 Light sensor 21 Diffusion plate 23 Fly eye lens 25 Reflector mirror 27 Condenser mirrors 29 and 31 Lens 33 Collimation lens 35 Feedback Control Mechanism 37 Operational Amplifier 39 Lamp Driver 41 Positive Input Terminal 43 Negative Input Terminal 45 Output Terminal 47 Operation Element 49 Amplifier 51 Volume 53 Control Input Terminal 55 Positive Output Terminal 57 Negative Output Terminal 61 Aperture Mechanism 63 Light Control Plate 65 Shutter Plate 67 Large diameter hole 69 Small diameter hole 71 Opening 73 Stepping motor 75 Computer circuit L Irradiation light L1 Measurement light L2 Irradiation light l Optical axis

Claims (6)

A lamp that emits light similar to sunlight,
An optical system for guiding the light emitted by the lamp to the irradiated surface,
The optical system includes a reflecting plate for reflecting the light toward the irradiated surface,
The solar panel is a daylighting window provided on the reflector, and has a daylighting window allowing passage of a part of the light used to measure the amount of light incident on the reflector. Simulator. The solar simulator according to claim 1, wherein the daylighting window has an axis parallel to the optical axis of the light incident on the first reflecting plate. The optical system includes a reflecting mirror that reflects the light toward the reflecting plate, and a lens that is disposed between the reflecting plate and the reflecting mirror to make the illuminance uniform on the irradiated surface. The solar simulator according to claim 1, wherein the solar simulator is provided. The solar simulator according to claim 3, wherein the optical system includes a diaphragm mechanism that is disposed between the reflecting mirror and the lens and adjusts the light amount of the light. Furthermore, the feedback control mechanism for adjusting the output of the said lamp based on the value of the light quantity about the light which passed the lighting window of the said reflecting plate is included, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Solar simulator described in 1. 5. The solar simulator according to claim 4, further comprising a feedback control mechanism for controlling the diaphragm mechanism based on a light amount value of light that has passed through the daylighting window of the reflecting plate.

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