CN108931716B

CN108931716B - Measuring equipment for solar cell

Info

Publication number: CN108931716B
Application number: CN201710367863.6A
Authority: CN
Inventors: 廖华贤; 陈震伟; 林啓清; 吴恒信; 陈泓展; 陈俊橙; 林高同; 张祐诚; 勤竣傑
Original assignee: Enli Technology Co ltd
Current assignee: Enli Technology Co ltd
Priority date: 2017-05-23
Filing date: 2017-05-23
Publication date: 2020-09-18
Anticipated expiration: 2037-05-23
Also published as: CN108931716A

Abstract

A measuring device for a solar cell comprises a light source unit, a light equalizing unit, a light intensity monitoring unit and an operation control unit. The light source unit includes a plurality of light emitting diodes capable of emitting light of different wavelengths. The light-equalizing unit defines a light-equalizing space for equalizing the light of the light source unit. The operation control unit can calculate the intensity of the light received by the light intensity monitoring unit and can capture and calculate the signal generated after the light with the corresponding flicker frequency irradiates the solar cell according to the flicker frequency of the light received by the light intensity monitoring unit. The device has small volume and low cost, can detect the response of the solar cell to the light rays with different wave bands, and has quite accurate measurement and high reliability.

Description

Measuring equipment for solar cell

Technical Field

The present invention relates to a measurement apparatus for a solar cell, and more particularly, to a measurement apparatus for measuring quantum efficiency and spectral response of a solar cell.

Background

In the existing measuring equipment for measuring External quantum efficiency (EQE for short) or Spectral Response (SR for short) of a solar cell, a xenon lamp light source is used, and a light source system suitable for the solar cell measuring equipment can be completed only by using a single spectrometer for wavelength screening, using a photointerrupter for light interception and light opening, and using an optical lens and an optical light equalizing system. However, each optical component added from the xenon lamp light source to the xenon lamp light source has its own instability, which causes the light stability to be a difficult problem for the existing xenon lamp light source to be used in the measuring system, the repetition accuracy of the photoelectric conversion efficiency measured by the general xenon lamp measuring equipment can only reach about 1% error repeatability, and can not reach smaller and more precise repeatability (for example, less than 0.1%), and the volume and the cost of the whole measuring equipment are too large and too high due to the alignment, the mechanism design and the assembly structure among the related optical components of the above-mentioned monochromator, photointerrupter, lens, the light equalizing system and the like.

In addition, when the existing light source is used for measurement, the light intensity and the spectrum of the detection light source are calibrated by using a standard solar cell or a standard reflection white board before measurement, and the measured fixed values are stored in a computer after the measurement. However, since the light source may be aged after a long time, and the intensity and spectrum of the light source may change, if the intensity of the light source is not detected at any time for correction after a long time use, the fixed measurement values stored in the computer are adopted from beginning to end, and the error may occur after a long time use, which is not a real measurement condition. On the other hand, although some existing light source measuring devices are provided with devices for monitoring the light intensity and the light spectrum in real time, the structure and the optical characteristics of the existing measuring devices are limited, the design of the real-time monitoring devices is complicated, and the spectroscope is arranged to split part of the light source to measure the light intensity and the light spectrum, so that more light source intensity is sacrificed, and the measuring speed is slowed down. The above problems are the problems encountered and solved by the existing measuring equipment.

Disclosure of Invention

The present invention is directed to a solar cell measurement apparatus that overcomes at least one of the disadvantages of the related art.

The invention relates to a measuring device of a solar cell, which is used for detecting the solar cell and comprises a light source unit, wherein the light source unit comprises a plurality of light emitting diodes which can emit light rays with different wavelengths, and the light emitting diodes can be controlled to flicker and emit light. The solar cell measuring apparatus further includes: the light source unit is arranged on the front side of the light source unit and is used for emitting light rays of the light emitting diode, the light source unit is arranged on the front side of the light source unit, the light intensity monitoring unit is arranged on the front side of the light source unit, the operation control unit is used for defining a light homogenizing space for the light rays of the light emitting diode to pass through, and the light homogenizing space is provided with an inlet, an outlet and a first light splitting port, wherein the inlet is adjacent to the light source unit, the outlet is adjacent to the solar cell, and the first light splitting port is arranged between; the light intensity monitoring unit comprises a light intensity detector which is adjacent to the first light splitting port and is used for receiving the light rays from the first light splitting port; the operation control unit comprises a signal receiving module used for receiving signals generated after the solar cell is irradiated by the light source unit, and an operation module connected with the signal receiving module and the light intensity monitoring unit through signals, wherein the operation module is used for obtaining the intensity of light rays received by the light intensity detector through operation, and can also be used for capturing and operating signals generated after the light rays with corresponding flicker frequencies irradiate the solar cell according to the flicker frequencies of the light rays received by the light intensity detector.

The measuring equipment of the solar cell of the invention, the light equalizing unit and the light source unit are arranged along an optical axis, the light equalizing unit comprises a first light equalizing piece facing the light source unit, a second light equalizing piece positioned between the first light equalizing piece and the solar cell, and a connecting seat connected between the first light equalizing piece and the second light equalizing piece, the first light-equalizing member defines a first chamber for the light of the LED to enter, the second light-homogenizing piece defines a second cavity for the light from the first cavity to enter, and the light from the second cavity is emitted to the solar cell, the size of the first chamber is smaller than that of the second chamber, the connecting seat gradually enlarges from the first light homogenizing piece to the second light homogenizing piece, and a connecting cavity communicated with the first cavity and the second cavity is defined by the light-equalizing space.

The invention relates to a measuring device of a solar cell, wherein the connecting seat comprises a seat surrounding wall which surrounds the optical axis and defines the connecting cavity, the seat surrounding wall is provided with a surrounding wall part which is provided with a first light splitting port, and an acute included angle between the extending direction of the surrounding wall part and the extending direction of the optical axis is more than 45 degrees.

The light homogenizing unit of the measuring equipment for the solar cell further comprises a diffusion plate which is arranged between the first light homogenizing piece and the connecting seat and is used for homogenizing light.

The light equalizing unit of the measuring equipment for the solar cell further comprises a first baffle plate which is arranged in the connecting chamber and is adjacent to the first light splitting port, and the first baffle plate is used for isolating light rays which irradiate the solar cell and are reflected back to enter the first light splitting port.

The invention relates to a measuring device of a solar cell, wherein a connecting seat comprises a seat surrounding wall which surrounds an optical axis and defines a connecting cavity, the seat surrounding wall is provided with a first light splitting port and a second light splitting port which is positioned between an inlet and an outlet and is spaced from the first light splitting port, and the measuring device of the solar cell also comprises a spectrum monitoring unit which is adjacent to the second light splitting port and is used for detecting the light spectrum of a light emitting diode.

The light equalizing unit further comprises a first baffle and a second baffle which are arranged in the connecting chamber and respectively adjacent to the first light splitting port and the second light splitting port, the first baffle is used for isolating light rays irradiated to the solar cell and reflected back to enter the first light splitting port, and the second baffle is used for isolating light rays irradiated to the solar cell and reflected back to enter the second light splitting port.

The first light homogenizing piece and the second light homogenizing piece are integrated columns, the length of the first cavity extending along the optical axis is 8 cm-20 cm, and the length of the second cavity extending along the optical axis is 30 cm-100 cm.

According to the measuring equipment of the solar cell, the first light homogenizing piece and the second light homogenizing piece are hollow quadrate, the length and the width of the first cavity are 3 cm-8 cm, and the length and the width of the second cavity are 15.6 cm-20 cm.

The measuring equipment of the solar cell also comprises a spectrum monitoring unit which is adjacent to the second light splitting port and used for detecting the light spectrum of the light emitting diode.

The invention has the beneficial effects that: the light source unit is provided with the light emitting diode, so that light with different wavelengths can be emitted, the sunlight spectrum can be simulated, various colored lights with different wave bands can be generated conveniently, and the integral measuring equipment has small volume and low cost. The light intensity monitoring unit is used for monitoring light intensity and detecting light ray flicker frequency, so that the operation control unit can capture corresponding detection signals, can measure the response of the solar cell to light rays of different wave bands, and has the advantages of relatively accurate measurement and high reliability.

Drawings

Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic perspective view illustrating some components of an embodiment of an apparatus for measuring a solar cell according to the present invention;

FIG. 2 is a schematic cross-sectional view of some of the elements of the embodiment;

FIG. 3 is a functional block diagram of some of the elements of the embodiment;

FIG. 4 is a perspective view illustrating the components of this embodiment mounted in a housing as a modular design.

Detailed Description

Referring to fig. 1, 2 and 3, an embodiment of the measuring apparatus for a solar cell 1 of the present invention is used for detecting characteristics such as conversion efficiency of the solar cell 1, and includes a light source unit 2, a light equalizing unit 3, a light intensity monitoring unit 4, a spectrum monitoring unit 5, and an operation control unit 6.

The light source unit 2 includes a substantially square circuit board 21, and a plurality of light emitting diodes 22 arranged in an array up, down, left and right on the circuit board 21. The LEDs 22 can emit light of different wavelengths and can be controlled to flash at a specific frequency.

The light-equalizing unit 3 is located at the front side of the light source unit 2 along an optical axis L, and defines a light-equalizing space 30 for the light of the light-emitting diode 22 to pass through so as to equalize the light, the light-equalizing space 30 has an inlet 301 adjacent to the light source unit 2, an outlet 302 adjacent to the solar cell 1, and a first light-splitting port 303 and a second light-splitting port 304 located between the inlet 301 and the outlet 302 and spaced from each other and facing each other. Specifically, the light-equalizing unit 3 of the present embodiment includes a first light-equalizing member 31 facing the light source unit 2, a second light-equalizing member 32 located between the first light-equalizing member 31 and the solar cell 1, a connecting seat 33 disposed between the first light-equalizing member 31 and the second light-equalizing member 32, a diffusion plate 34, a first baffle 35, and a second baffle 36.

The first light-equalizing member 31 defines a first chamber 310 for the light of the LED 22 to enter from the light-equalizing space 30, and the first chamber 310 has the inlet 301. The second light-equalizing member 32 defines a second chamber 320 for the light passing through the first chamber 310 to enter into the light-equalizing space 30, the second chamber 320 has the outlet 302, and the light passing through the second chamber 320 is emitted to the solar cell 1. The first light homogenizing part 31 and the second light homogenizing part 32 are both hollow quadrate and are both an integral column, and light can be reflected by the inner surface of the integral column for multiple times in the process of advancing inside the integral column, so that the light homogenizing effect is achieved. The size of the first chamber 310 is smaller than that of the second chamber 320, the size of the first chamber 310 is related to the size of the light source unit 2, and the size of the second chamber 320 is related to the size of the solar cell 1. The length d1 of the first chamber 310 extending along the optical axis L is 8cm to 20cm, the length d2 of the second chamber 320 extending along the optical axis L is 30cm to 100cm, and the extending lengths of the

chambers

310 and 320 are made to be long enough by appropriate d1 and d2, so that the light traveling distance and the reflection times are enough to obtain a good homogenization effect. The length a1 and width b1 of the first chamber 310 are 3 cm-8 cm, and the length a2 and width b2 of the second chamber 320 are 15.6 cm-20 cm. The lengths a1, a2 and the widths b1, b2 of the chambers mean that the projection of the chambers on a vertical plane having one extending plane perpendicular to the optical axis L is a square, the length and width of the square are the length and width of the chambers, and in the case of a square, the length and width are the same.

The connecting seat 33 includes a seat wall 331 surrounding the optical axis L, the seat wall 331 gradually expands from the first light-equalizing member 31 to the second light-equalizing member 32, and defines a connecting cavity 330 connecting the first cavity 310 and the second cavity 320 with the light-equalizing space 30. The seat surrounding wall 331 has two surrounding wall portions 332 that are opposite to each other at intervals and respectively form the first light splitting port 303 and the second light splitting port 304. The connecting seat 33, the first light-equalizing member 31 and the second light-equalizing member 32 of the present embodiment are three independent elements and connected together to define the light-equalizing space 30, and in terms of structural design and optical effect, the first light-equalizing member 31 and the second light-equalizing member 32 are separate independent elements, which is more convenient to manufacture. However, in practice, the first light homogenizing member 31, the second light homogenizing member 32 and the connecting seat 33 may be integrally formed.

The diffusion plate 34 is disposed between the first light-equalizing member 31 and the connecting seat 33, and is made of a light-permeable plastic material, and has functions of diffusing and equalizing light. The first baffle 35 is disposed in the connecting chamber 330 and adjacent to the first light splitting opening 303, and the first baffle 35 is used for isolating light rays irradiated to the solar cell 1 and reflected back to enter the first light splitting opening 303. The second baffle 36 is disposed in the connecting chamber 330 and adjacent to the second light splitting opening 304, and the second baffle 36 is used for isolating light rays reflected back after being irradiated onto the solar cell 1 from entering the second light splitting opening 304.

The light intensity monitoring unit 4 is used for detecting the light intensity of the light source unit 2, and includes a light intensity detector 41 adjacent to the first light splitting port 303 and used for receiving the light from the first light splitting port 303, and a signal processing module 42 in signal connection with the light intensity detector 41 and the operation control unit 6.

The spectrum monitoring unit 5 is adjacent to the second light splitting port 304 and is used for detecting the light spectrum of the led 22 to identify the peak wavelength (peak wavelength) and the waveform of the light source. The spectrum monitoring unit 5 comprises a spectrometer 51 in signal connection with the arithmetic and control unit 6. In addition, the spectrum monitoring unit 5 may further include a fiber light guide (not shown) for guiding the light emitted from the second light splitting port 304, and a lens (not shown) located between the fiber light guide and the spectrum monitoring unit 5 for focusing the light, so that the light emitted from the second light splitting port 304 can be reliably guided to the spectrometer 51, and the intensity and the detection effect of the light entering the spectrometer 51 can be improved.

The operation control unit 6 comprises a signal receiving module 61 connected with the solar battery 1 by signals, an operation module 62 connected with the signal receiving module 61, the signal processing module 42 of the light intensity monitoring unit 4 and the spectrum monitoring unit 5 by signals, and a display module 63 connected with the operation module 62 by signals. The signal receiving module 61 is used for detecting an electrical signal (i.e., a response signal to incident light) generated by the solar cell 1 after being illuminated by light, the signal receiving module 61 receives the photocurrent and converts the photocurrent into a voltage, and then the voltage square wave is converted into a sine-like wave through a dc filter circuit, in which process noise and background signals can be filtered out, and the operation module 62 is subsequently matched to convert the sine-like wave to obtain the response of the solar cell 1 to light. The operation module 62 is used for calculating the intensity of the light received by the light intensity detector 41, and the operation module 62 can also capture and calculate the signal generated by the signal received by the signal receiving module 61 after the light with the corresponding flicker frequency is irradiated on the solar cell 1 according to the flicker frequency of the light received by the light intensity monitoring unit 4, which will be described later. The display module 63 is used for displaying the detection result of the solar cell 1, and the detected intensity, light source spectrum and wave peak of the light source unit 2. The operation module 62 and the display module 63 of the operation control unit 6, such as a computer, have the functions of operation, control, display, etc.

When the invention is used, different signals can be used to drive the light emitting diodes 22 of the light source unit 2 to emit light, the light emitting diodes 22 can all emit light simultaneously, can also partially emit light simultaneously, or can all emit light in turn, and the light emitting mode can be flash light. When all the LEDs 22 are lighted and flickered to emit light, the flickering frequency of each LED 22 is different, and the time for performing one detection is about 1 second to 10 seconds. When the LEDs 22 emit light in turn, the time for one detection is about 10-30 seconds. That is, the light emitting time, frequency, and whether the light emitting diodes 22 emit light simultaneously can be controlled to generate the required light, and the light of each light emitting diode 22 can illuminate different positions on the solar cell 1 after passing through the light equalizing unit 3. With the control of the light emitting characteristics of the LEDs 22, the light source unit 2 can generate light simulating the spectrum of sunlight, so as to detect the response of the solar cell 1 to sunlight, and can also generate light of a narrower wavelength band to detect the response of the solar cell 1 to light of different wavelength bands.

Specifically, the light emitted from the light source unit 2 enters from the inlet 301 of the light-equalizing space 30, and is reflected multiple times inside the first light-equalizing member 31 to achieve the light-equalizing effect, and then the light is subjected to the diffusion-equalizing effect of the diffusion plate 34, enters the second light-equalizing member 32 through the connecting seat 33, and is reflected multiple times, and finally exits from the outlet 302 and irradiates the solar cell 1, and the solar cell 1 receives the incident light to generate the photocurrent, which is received by the signal receiving module 61 of the operation control unit 6, and after the operation analysis by the operation module 62, the response of the solar cell 1 to the light, such as the External Quantum Efficiency (EQE) or the Spectral Response (SR), can be obtained.

The light intensity of the light source unit 2 changes and attenuates after being used for a period of time, so that the light intensity is detected by the light intensity monitoring unit 4, the light intensity can be measured at intervals, and the measurement result can be corrected when the light intensity changes, so that the detection reliability is high. For example, a part of the light emitted from the light source unit 2 is emitted from the first light splitting port 303, and the light intensity detector 41 of the light intensity monitoring unit 4 receives the light and converts the light into an electrical signal, and the electrical signal is amplified by the amplifying circuit, and then the computing module 62 of the computing control unit 6 calculates and analyzes the electrical signal to obtain the light intensity. Assuming that the light intensity measured in the second detection is 98% of that in the first detection, the factor that the light intensity has changed to 98% of the original light intensity is also considered accordingly, so that the detection result is corrected according to the change of the light intensity to eliminate the detection error caused by the change of the light intensity, and therefore, the invention can obtain a more accurate signal value by the design, and the measurement repeatability can be accurate to less than 0.1% in terms of the photoelectric conversion efficiency. The light intensity monitoring unit 4 is disposed on the first baffle 35 for preventing the reflected light incident to the solar cell 1 from being emitted from the first light splitting opening 303, so as to improve the accuracy of light intensity monitoring.

It should be noted that each led 22 of the light source unit 2 will illuminate the solar cell 1 in a manner of flashing at a certain frequency, the solar cell 1 will generate a signal with the same frequency as the flashing frequency of the light, and the arithmetic and control unit 6 must first know what corresponding signal of the flashing frequency is to be captured when knowing the response signal of the solar cell 1 to the light of a certain wavelength band. In the present invention, the light received by the light intensity monitoring unit 4 is directly emitted by the light source unit 2, so that the light flicker frequency signal received by the light intensity monitoring unit 4 is synchronous with the light flicker frequency of the light source unit 2, so that the light intensity monitoring unit 4 can detect the light intensity, and can also detect the on/off and flicker frequency of the light. Because the light emitting diodes 22 have different flashing frequencies, if the battery detection is performed on the light with a certain flashing frequency, the light intensity monitoring unit 4 can detect the light flashing frequency of the light emitting diodes 22 and transmit the light flashing frequency to the operation module 62, so that the operation module 62 can capture the signal generated after the solar battery 1 is irradiated by the light with the flashing frequency in the signal detected by the signal receiving module 61, that is, only capture the signal with the same frequency and ignore all the signals with other frequencies, so that the operation module 62 can analyze the response of the solar battery 1 to the light after the solar battery 1 is irradiated by the light with the specific flashing frequency, and the invention can detect the effect of the light with various different wave bands on the battery.

In addition, the spectrum monitoring unit 5 is arranged to detect the light spectrum of the light source unit 2, and a part of light rays emitted from the inlet 301 of the light source unit 2 enter the spectrometer 51 through the second light splitting port 304, so that the spectrum waveform and the peak wavelength can be measured, the spectrum measurement can be performed at intervals, and when the spectrum waveform and the peak wavelength have a deviation, the instrument inspection and the real-time correction are performed, so as to improve the measurement accuracy of the measurement device of the present invention. Similarly, the second baffle 36 is disposed to prevent the reflected light incident on the solar cell 1 from being emitted through the second light splitting opening 304, so as to improve the precision of spectrum monitoring.

Preferably, an acute included angle θ between the extending direction of each surrounding wall portion 332 and the extending direction of the optical axis L is greater than 45 °, so that the slope of the surrounding wall portion 332 is appropriate, which is more favorable for the split light to enter the first light splitting port 303 and the second light splitting port 304, and in this way, the light splitting is performed by using the structure of the surrounding wall portion 332 to achieve the purpose of real-time monitoring of the light intensity and the light spectrum, and a beam splitter is not required, so that the sacrifice of the light intensity of the light source can be reduced. And thus, the incident light can be reflected multiple times by the inner surface of the second light uniformizing element 32 after entering the second light uniformizing element 32. Since the acute angle smaller than 45 ° affects the traveling path of the light, the light may not be properly reflected multiple times inside the second light uniformizing element 32 due to the shielding of the surrounding wall portion 332. The design of the invention can maintain good light-equalizing effect.

In summary, the light source unit 2 with the light emitting diode 22 can emit light beams with different wavelengths to facilitate the simulation of the solar spectrum and the generation of various colored lights with different bands, so that the devices such as a single spectrometer and a light temporary wave filter, which are required by the conventional xenon lamp light source, are not required, and the overall measuring device of the present invention has a small volume and a low cost. The light-equalizing unit 3 is provided with the first chamber 310 and the second chamber 320 which are smaller and larger, and a good light-equalizing effect can be achieved through the matching of the two

chambers

310 and 320. In addition, the light intensity monitoring unit 4 monitors the light intensity, can grasp whether the light source intensity is stable, and can correct the measurement result in real time according to the light intensity, thereby achieving the advantages of accurate measurement and high repeatability, and the light intensity monitoring unit 4 can also detect the light ray flicker frequency, so that the operation control unit 6 can capture the corresponding detection signal, and can obtain the response signal of the solar cell 1 to various light rays, thereby being quite accurate in measurement. Furthermore, the spectrum monitoring unit 5 is used for monitoring the spectrum of the light source, and can also optimize the accuracy and repeatability of the measurement. Therefore, the invention can monitor the light intensity and the light spectrum in real time, and even if the light source is changed under the conditions of long-time use or different environments, temperatures, humidity and electric power, the light intensity and the light spectrum can be monitored and recorded, thereby avoiding measurement errors.

It should be noted that, referring to fig. 2 and 4, the measuring apparatus of the present invention may further include a housing 7, and the aforementioned components of the present invention may be integrated into the housing 7 to form a modular design. The housing 7 forms an accommodating space therein, and the housing 7 includes a first casing 71, a second casing 72, and a connecting casing 73 connected between the first casing 71 and the second casing 72 and extending obliquely. The light source unit 2 and the first light uniformizing element 31 are correspondingly disposed in the first casing 71, and as for the direction of fig. 4, the light source unit 2 is located above the first light uniformizing element 31, the light propagation direction is downward, and the solar cell to be tested must be placed below the housing 7. In addition, a circuit board, a heat dissipation element, etc. may be disposed in the first housing 71, but these elements are not essential to the improvement of the present invention and will not be described again. The second light equalizing member 32 is disposed in the second housing 72, and the connecting seat 33 is disposed in the connecting housing 73.

In addition, the measuring apparatus further includes a wire 81 extending into the first housing 71 from the top wall of the first housing 71 and electrically connected to the light source unit 2, a fiber optic tube 82 passing through the connecting housing 73 to connect the second beam splitting port 304 and the spectrometer 51, and two handles 83 respectively disposed at the left and right sides of the housing 7. The handle 83 can facilitate the operation and the moving of the measuring device of the invention, because the invention can be designed into a modular design with small volume and light weight as shown in fig. 4, the invention is a portable multi-wavelength light source device, when measurement is to be carried out, the modular measuring device can be arranged on a slide rail mechanism which is not shown in the figure, so that the measuring device can be moved above the solar cell along the slide rail mechanism, and at the moment, the work of carrying the device, moving measurement and the like can be completed by one person, and the moving device can be operated by one person, thus being very practical and convenient.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.

Claims

1. A solar cell measuring apparatus for detecting a solar cell, the apparatus comprising a light source unit, the light source unit comprising a plurality of light emitting diodes emitting light of different wavelengths, the light emitting diodes being controllable to blink, the apparatus further comprising: a light-equalizing unit, a light intensity monitoring unit, and an operation control unit, the light-equalizing unit is located in front of the light source unit and defines a light-equalizing space for the light of the LED to pass through to equalize the light, the light-equalizing space has an inlet adjacent to the light source unit, an outlet adjacent to the solar cell, and a first light-splitting port located between the inlet and the outlet, the light-equalizing unit and the light source unit are arranged along an optical axis, the light-equalizing unit includes a first light-equalizing member facing the light source unit, a second light-equalizing member located between the first light-equalizing member and the solar cell, and a connecting seat connected between the first light-equalizing member and the second light-equalizing member, the first light-equalizing space defines a first chamber for the light of the LED to enter, the second light-homogenizing piece defines a second cavity for light rays entering from the first cavity to enter into the light-homogenizing space, the light rays passing through the second cavity can be emitted to the solar cell, the size of the first cavity is smaller than that of the second cavity, the connecting seat gradually expands from the first light-homogenizing piece to the second light-homogenizing piece, and the light-homogenizing space defines a connecting cavity for communicating the first cavity with the second cavity; the light intensity monitoring unit comprises a light intensity detector which is adjacent to the first light splitting port and is used for receiving the light rays from the first light splitting port; the operation control unit comprises a signal receiving module used for receiving signals generated after the solar cell is irradiated by the light source unit, and an operation module connected with the signal receiving module and the light intensity monitoring unit through signals, wherein the operation module is used for obtaining the intensity of light rays received by the light intensity detector through operation, and can also be used for capturing and operating signals generated after the light rays with corresponding flicker frequencies irradiate the solar cell according to the flicker frequencies of the light rays received by the light intensity detector.

2. The apparatus of claim 1, wherein: the linking seat comprises a seat surrounding wall which surrounds the optical axis and defines the linking cavity, the seat surrounding wall is provided with a surrounding wall part which is formed with the first light splitting port, and an acute included angle between the extending direction of the surrounding wall part and the extending direction of the optical axis is larger than 45 degrees.

3. The apparatus of claim 1, wherein: the light-homogenizing unit also comprises a diffusion plate which is arranged between the first light-homogenizing piece and the connecting seat and is used for homogenizing light.

4. The apparatus of claim 1, wherein: the light equalizing unit further comprises a first baffle which is arranged in the connecting chamber and is adjacent to the first light splitting port, and the first baffle is used for isolating light rays which irradiate the solar cell and are reflected back to enter the first light splitting port.

5. The apparatus of claim 1, wherein: the connecting seat comprises a seat surrounding wall which surrounds the optical axis and defines the connecting cavity, the seat surrounding wall is provided with a first light splitting port and a second light splitting port which is positioned between the inlet and the outlet and is spaced from the first light splitting port, and the measuring equipment of the solar cell further comprises a spectrum monitoring unit which is adjacent to the second light splitting port and is used for detecting the light spectrum of the light-emitting diode.

6. The apparatus of claim 5, wherein: the light equalizing unit further comprises a first baffle and a second baffle which are arranged in the connecting cavity and respectively adjacent to the first light splitting port and the second light splitting port, the first baffle is used for isolating light rays irradiated to the solar cell and then reflected back to the solar cell to penetrate into the first light splitting port, and the second baffle is used for isolating light rays irradiated to the solar cell and then reflected back to the solar cell to penetrate into the second light splitting port.

7. The apparatus of claim 1, wherein: the first light homogenizing element and the second light homogenizing element are both an integrating column, the length of the first cavity extending along the optical axis is 8 cm-20 cm, and the length of the second cavity extending along the optical axis is 30 cm-100 cm.

8. The apparatus of claim 7, wherein: the first light homogenizing piece and the second light homogenizing piece are hollow quadrate, the length and the width of the first cavity are 3 cm-8 cm, and the length and the width of the second cavity are 15.6 cm-20 cm.

9. The apparatus of claim 1, wherein: the light-equalizing space is also provided with a second light-splitting port which is positioned between the inlet and the outlet and is separated from the first light-splitting port, and the measuring equipment of the solar cell also comprises a spectrum monitoring unit which is adjacent to the second light-splitting port and is used for detecting the light spectrum of the light-emitting diode.