Detection system

Abstract

The utility model provides a kind of detection system, including light emitting device and at least one photographing device, light emitting device is used to issue detection light to photovoltaic product piece, photographing device is used to photograph the area of photovoltaic product piece being detected light irradiation, light emitting device is area light source, and photographing device is area array camera.The detection system provided by the utility model can detect the surface defects of photovoltaic product piece lacking electronic device loop, and can collect the entire surface light emitting state of photovoltaic product piece with loop inside, which is convenient for intuitively identifying internal circuit defects such as short circuit, suitable for various types of photovoltaic product piece, and can identify surface defects and circuit failure defects on photovoltaic product piece at one time, improve the adaptability of detection system to different products to be detected, ensure the detection efficiency of photovoltaic product piece, and further ensure the production capacity and product yield of photovoltaic product piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic detection technical field, specifically, relate to a detection system. BACKGROUND

[0002] In solar cell detection, photoluminescence (PL) principle or electroluminescent (EL) principle is usually used, that is, the surface defects of photovoltaic product wafer are detected by irradiating the original silicon wafer or cell wafer or applying electricity.

[0003] For example, in cell wafer detection, electroluminescent detection equipment is usually used for short circuit detection of cell wafer. Specifically, the electroluminescent detection equipment applies electricity to the cell wafer to be detected, so that the loops of multiple cells on the cell wafer are simultaneously turned on, and then the whole cell wafer emits light. Then, the camera images the whole surface of the cell wafer. If there is a short circuit defect, the light intensity of the defect will be different from that of the other parts, resulting in dark spots, bright spots and other problems, and then the short circuit defect detection is realized.

[0004] In the detection of original silicon wafer, infrared light source is usually used for single-sided defect detection of silicon wafer. The detection light path is generally as follows: first, the OS light source irradiates infrared light on the original silicon wafer to form a linear light spot, and then the linear array camera images to realize defect detection. Under the action of infrared light, the original silicon wafer produces photoluminescence phenomenon, that is, after absorbing the photons of infrared light, the original silicon wafer undergoes electronic transition and radiates new photons, so that the linear array camera can capture the light generated on the surface of the original silicon wafer, and then the surface structure shape and size of the original silicon wafer can be obtained, and the surface defect detection can be realized.

[0005] The existing photovoltaic product wafer detection process often needs to use the above two types of detection equipment at the same time, which has low detection efficiency and long detection time. Not only does it seriously affect the production capacity of the production line, but the long process time of the detection steps also causes a certain yield loss to the photovoltaic product wafer, affecting the yield of the product.

[0006] Therefore, how to provide a device capable of efficiently detecting photovoltaic product wafer has become a technical problem to be solved in the field. UTILITY MODEL CONTENT

[0007] The utility model aims to solve one of the technical problems in the related art to some extent. Therefore, the utility model provides a detection system, which can ensure the detection efficiency of photovoltaic product wafer, and then ensure the production capacity and yield of photovoltaic product wafer.

[0008] In order to achieve the above object, the utility model provides a detection system, including light emitting device and at least one photographing device, the light emitting device is used for sending detection light to photovoltaic product piece, the photographing device is used for photographing the area of photovoltaic product piece is irradiated by detection light, wherein, the light emitting device is area light source, the photographing device is area array camera.

[0009] Optionally, the photographing device comprises a first area array camera and a second area array camera, and the first area array camera and the second area array camera are used for photographing the two side surfaces of the irradiated area of the photovoltaic product piece respectively.

[0010] Optionally, the detection system further comprises a carrier device, and the carrier device is used for fixing the photovoltaic product piece.

[0011] Optionally, the carrier device comprises a transmission guide rail and a plurality of advancing components, and the advancing components are used for fixing the photovoltaic product piece.

[0012] The plurality of advancing components are movably arranged on the transmission guide rail, the advancing components can move along the transmission guide rail, and the advancing components can stop moving when the positions of the advancing components correspond to the positions of the photographing device, so that the photographing device photographs the photovoltaic product piece.

[0013] Optionally, the light emitting device comprises a plurality of laser light sources, the plurality of laser light sources are arrayed, and the laser light sources are vertical cavity surface emitting laser light sources.

[0014] Optionally, the plurality of laser light sources are arranged in a rectangular array.

[0015] Optionally, the plurality of laser light sources are arranged in a square array, and the plurality of laser light sources can irradiate square light spots arranged in a rectangular array on the photovoltaic product piece.

[0016] Optionally, the light emitting device comprises a light guide fiber and a plurality of lamp beads, the plurality of lamp beads correspond to the positions of the incident ends of the light guide fiber, the light guide fiber is used for transmitting the light incident into the incident ends to the emergent ends to irradiate the photovoltaic product piece, and the cross-sectional shape of the light guide fiber is a polygon.

[0017] Optionally, the cross-sectional shape of the light guide fiber is a rectangle.

[0018] Optionally, the light emitting device further comprises an end cap, the end cap is made of transparent material, a first end of the end cap is connected with the incident end of the light guide fiber, a second end of the end cap is arranged opposite to the plurality of lamp beads, and the size of the end cap gradually increases in the direction away from the incident end of the light guide fiber.

[0019] Optionally, the plurality of lamp beads are arrayed.

[0020] Optionally, the detection system further comprises at least one infrared lens, which is arranged on the light-in side of the photographing device and can allow infrared light to pass through.

[0021] Optionally, the slide device comprises a plurality of pairs of first advancing assemblies and a pair of conveying rails arranged on both sides of the detection point, each pair of the first advancing assemblies is arranged on the conveying rails on both sides and can support the side edges of the photovoltaic product sheet on both sides, and the pairs of the first advancing assemblies can move synchronously on the conveying rails in the conveying direction to drive the photovoltaic product sheet to move in the conveying direction and pass through the detection point.

[0022] Optionally, the bottom of the first advancing assembly is provided with a plurality of driving wheels, each of which is in contact with the conveying rail, and the first advancing assembly can drive the driving wheels at the bottom to rotate to move along the conveying rail.

[0023] Optionally, the slide device comprises a conveying rail and a plurality of second advancing assemblies, the conveying rail extends in the conveying direction, and the second advancing assemblies are arranged on the conveying rail and can move on the conveying rail in the conveying direction, the second advancing assemblies can fix the edges of the photovoltaic product sheet to drive the photovoltaic product sheet to pass through the detection point.

[0024] Optionally, the slide device comprises a pair of conveying belts arranged on both sides of the detection point and a plurality of pairs of supporting members, each pair of the supporting members is arranged on the conveying belts on both sides and can support the side edges of the photovoltaic product sheet on both sides, the conveying belts extend in the conveying direction and can drive the supporting members to drive the photovoltaic product sheet to move in the conveying direction and pass through the detection point.

[0025] Optionally, the detection system further comprises a first camera support, a second camera support and a light source support, the first area array camera is arranged on the first camera support, the second area array camera is arranged on the second camera support, and the light emitting device is arranged on the light source support.

[0026] As an optional embodiment of the utility model, the detection system further comprises at least one infrared lens, which is arranged on the light-in side of the photographing device and can allow infrared light to pass through.

[0027] Optionally, the detection system further comprises a first infrared lens and a second infrared lens, the first infrared lens is arranged on the light entrance side of the first area array camera, and the second infrared lens is arranged on the light entrance side of the second area array camera.

[0028] Optionally, the first infrared lens has a transmittance of less than 0.01% for light with a wavelength less than 808 nm and a transmittance of more than or equal to 95% for light with a wavelength more than or equal to 1100 nm; and the second infrared lens has a transmittance of less than 0.01% for light with a wavelength less than 808 nm and a transmittance of more than or equal to 95% for light with a wavelength more than or equal to 1100 nm.

[0029] The detection system provided by the utility model is based on photoluminescence principle to detect defects of photovoltaic product pieces, that is, the photovoltaic product pieces are made to emit light by the light emitting device, and the defects are identified by the photographing device. Moreover, the light emitting device is a surface light source, and the photographing device is an area array camera, so that when the photovoltaic product pieces are detected, the light emitted by the light emitting device irradiates and emits light on a whole area on the surface of the photovoltaic product pieces, and the photographing device can also collect the image of the whole area on the surface of the photovoltaic product pieces at one time, so that the surface defects of the photovoltaic product pieces (such as original silicon pieces) without electronic device circuit, such as cracks, pollution, hidden cracks, scratches and the like, can be detected, and the whole surface light emitting state of the photovoltaic product pieces (such as cell pieces or finished photovoltaic assemblies produced by assembling cell pieces and the like) with internal circuit can be collected, so that internal circuit defects such as short circuit can be intuitively identified.

[0030] The detection system provided by the utility model is suitable for various types of photovoltaic product pieces, and can identify the surface defects and circuit fault defects on the photovoltaic product pieces at one time, so that the adaptability of the detection system to different products to be detected is improved, the detection efficiency of the photovoltaic product pieces is ensured, and the production capacity and product yield of the photovoltaic product pieces are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0031] The utility model will be further described in connection with the drawings:

[0032] Figure 1 is the structure schematic diagram of the detection system provided by the utility model embodiment;

[0033] Figure 2 is the structure schematic diagram of the detection system provided by the utility model embodiment;

[0034] Figure 3 is the structure schematic diagram of the detection system provided by the utility model embodiment;

[0035] Figure 4 is the structure schematic diagram of the detection system provided by the utility model embodiment;

[0036] Figure 5 is a structural schematic view of a slide device in a detection system according to an embodiment of the present application;

[0037] Figure 6 is a structural schematic view of a slide device in a detection system according to another embodiment of the present application.

[0038] Figure 7 is a structural schematic view of a slide device in a detection system according to another embodiment of the present application.

[0039] Explanation of Reference Signs:

[0040] 100, slide device; 111, transmission guide rail; 112, first advancing assembly; 121, second advancing assembly; 131, conveying belt; 132, support; 200, light emitting device; 310, first area array camera; 311, first infrared lens; 320, second area array camera; 321, second infrared lens; 10, photovoltaic product wafer. DETAILED DESCRIPTION

[0041] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the embodiments, it is intended to explain the present application, and cannot be understood as a limitation of the present application.

[0042] In this specification, "one embodiment" or "an example" or "an example" means that the specific features, structures or characteristics described in connection with the embodiment itself can be included in at least one embodiment of the present application. The appearance of the phrase "in one embodiment" at various places in the specification does not necessarily mean the same embodiment.

[0043] In the related art, the detection of the battery piece by electroluminescent detection equipment requires that the photovoltaic product wafer has formed a complete circuit structure, for example, it can be a battery piece, and it is difficult to form a loop inside the photovoltaic product wafer lacking a complete circuit structure such as a raw silicon wafer to realize light emission, and further to implement detection;

[0044] And when detecting the photovoltaic product wafer by photoluminescence detection equipment, only the image of the linear light spot can be obtained by the linear array camera at the same time, so as to identify the defects on the photovoltaic product wafer in the form of scanning, and in this process, the entire surface of the photovoltaic product wafer will not emit light uniformly, and it is difficult to intuitively identify the local bad points as electroluminescence.

[0045] Therefore, the existing photovoltaic product wafer detection process often needs to use the above two types of detection equipment at the same time, resulting in low photovoltaic product wafer detection efficiency.

[0046] To solve the above technical problems, the utility model provides a kind of detection system, as shown in Figures 1 to 7 It includes light emitting device 200 and at least one photographing device (for example, it can include first area array camera 310, second array camera 320), light emitting device 200 is used to issue detection light to photovoltaic product wafer 10, and photographing device is used to photograph the area of photovoltaic product wafer 10 irradiated by detection light, wherein light emitting device 200 is area light source, and photographing device is area array camera.

[0047] The utility model provides a kind of detection system based on photoluminescence principle to detect the defect of photovoltaic product wafer, that is, by light emitting device 200 irradiation photovoltaic product wafer 10 makes it emit light, and by photographing device to photograph it to identify defect.And, light emitting device 200 is area light source, and photographing device is area array camera, so that when detecting photovoltaic product wafer 10, the surface of a region of photovoltaic product wafer 10 is irradiated by light emitted by light emitting device 200 and emits light, and photographing device can also correspondingly collect the image of the whole surface of photovoltaic product wafer 10 at one time, to detect the surface defect of photovoltaic product wafer (such as original silicon wafer) lacking electronic device loop, such as crack, pollution, hidden crack, scratch and other defects, and to collect the whole surface light emitting state of photovoltaic product wafer (such as battery piece or battery string and other finished photovoltaic components assembled and produced by battery piece structure) formed with loop, to facilitate the intuitive identification of internal circuit defect such as short circuit.

[0048] The utility model provides a kind of detection system suitable for multiple types of photovoltaic product wafer, and can identify surface defects and circuit fault defects on photovoltaic product wafer at one time, improve the adaptability of detection system to different products to be detected, ensure the detection efficiency of photovoltaic product wafer, and further ensure the production capacity and product yield of photovoltaic product wafer.

[0049] In some embodiments of the utility model, the detection system can include only one photographing device, for example, as shown in Figure 1 The detection system includes first area array camera 310, and light emitting device 200 irradiates one side of photovoltaic product wafer 10, and first area array camera 310 photographs the surface of the corresponding side of photovoltaic product wafer 10.

[0050] To further improve the detection efficiency of photovoltaic product wafer, as a preferred embodiment of the utility model, as shown in Figures 2 to 4As shown in the figure, the photographing device comprises a first area array camera 310 and a second area array camera 320, and the first area array camera 310 and the second area array camera 320 are respectively used for photographing the two side surfaces of the irradiated area of the photovoltaic product sheet 10.

[0051] The inventor finds in the research that when the photovoltaic product sheet 10 is irradiated to appear the photoluminescence phenomenon, the irradiated surface of the photovoltaic product sheet 10 and the other side surface will also emit light, and the generated light of the other side can also be used for detecting the defect problem of the photovoltaic product sheet 10, so in the embodiment of the utility model, the photographing device comprises the first area array camera 310 and the second area array camera 320, and the two are respectively used for photographing the two side surfaces of the photovoltaic product sheet 10, so that the defect problems of the two sides of the photovoltaic product sheet 10 are identified in one-time photographing detection, and the detection efficiency of the photovoltaic product sheet is further improved.

[0052] As an optional embodiment of the utility model, as shown in the figure, Figures 3 to 7 As shown in the figure, the detection system further comprises a slide device 100, and the slide device 100 is used for fixing the photovoltaic product sheet 10, so as to ensure the position stability of the photovoltaic product sheet 10 in the detection process, and further ensure the definition of the picture obtained by the photographing device, and further ensure the accuracy of detecting the defects of the photovoltaic product sheet 10.

[0053] In order to further improve the detection efficiency of the photovoltaic product sheet 10, as a preferred embodiment of the utility model, as shown in the figure, Figure 3 As shown in the figure, the slide device 100 comprises a transmission guide rail 111 and a plurality of advancing assemblies 110, and the advancing assembly 110 is used for fixing the photovoltaic product sheet 10.

[0054] The plurality of advancing assemblies 110 are movably arranged on the transmission guide rail 111, the advancing assembly 110 can move along the transmission guide rail 111, and can stop moving when the position corresponds to the position of the photographing device (that is, when reaching the detection point), so that the photographing device photographs the photovoltaic product sheet 10.

[0055] In the embodiment of the utility model, the slide device 100 not only comprises the advancing assembly 110 capable of fixing the photovoltaic product sheet 10, but also can move along the transmission guide rail 111 and stop at the detection point, so that when one advancing assembly 110 stays at the detection point for detection, the photovoltaic product sheet 10 can be placed on other advancing assemblies 110 at the same time, or the photovoltaic product sheet 10 on other advancing assemblies 110 can be taken off, the time occupied by the action of loading and unloading the photovoltaic product sheet 10 in the detection process of each photovoltaic product sheet 10 is reduced, and the detection efficiency of the photovoltaic product sheet 10 is further ensured.

[0056] As an optional embodiment of the utility model, as shown in the figure, Figure 3As shown in the figure, the slide device 100 can fix the bottom end (or the top end) of the photovoltaic product sheet 10, so that the photovoltaic product sheet 10 is kept in a vertical state, and the first area array camera 310 and the second area array camera 320 are arranged transversely on both sides of the slide device 100 and take pictures of the two side surfaces of the photovoltaic product sheet 10, respectively.

[0057] Alternatively, as another optional embodiment of the utility model, the photovoltaic product sheet 10 can also be arranged horizontally on the slide device 100, for example, as an optional embodiment of the utility model, as shown in the figure, Figure 5 As shown in the figure, the slide device 100 comprises a pair of transmission rails 111 and a plurality of pairs of first advancing assemblies 112, the transmission rails 111 extend along the transmission direction a and are distributed on both sides of the detection point, each pair of first advancing assemblies 112 is arranged on the transmission rails 111 on both sides, respectively, and can support the side edges on both sides of the photovoltaic product sheet 10 on both sides of the photovoltaic product sheet 10, respectively, and the pair of first advancing assemblies 112 can move synchronously on different transmission rails 111 along the transmission direction a to drive the photovoltaic product sheet 10 to move along the transmission direction a and pass through the detection point.

[0058] Optionally, the first advancing assembly 112 can be a trolley structure and can automatically advance on the flat transmission rail 111. Specifically, as shown in the figure, Figure 5 As shown in the figure, the bottom of the first advancing assembly 112 has a plurality of drive wheels, the plurality of drive wheels are in contact with the transmission rail 111, and the first advancing assembly 112 can drive the plurality of drive wheels at the bottom to rotate to drive itself to move along the transmission rail 111.

[0059] As another optional embodiment of the utility model, as shown in the figure, Figure 6 As shown in the figure, the slide device 100 comprises a transmission rail 111 and a plurality of second advancing assemblies 121, the transmission rail 111 extends along the transmission direction a, the second advancing assemblies 121 are arranged on the transmission rail 111 and can move along the transmission direction a on the transmission rail 111, and the second advancing assemblies 121 can fix the edges of the photovoltaic product sheet 10 to drive the photovoltaic product sheet 10 to pass through the detection point.

[0060] As another optional embodiment of the utility model, as shown in the figure, Figure 7 As shown in the figure, the slide device 100 comprises a pair of conveyors 131 arranged on both sides of the detection point and a plurality of pairs of supporting pieces 132, each pair of supporting pieces 132 is arranged on the conveyors 131 on both sides, respectively, and can support the side edges on both sides of the photovoltaic product sheet 10 on both sides of the photovoltaic product sheet 10, respectively, the conveyors 131 extend along the transmission direction a and can drive the supporting pieces 132 to drive the photovoltaic product sheet 10 to move along the transmission direction a and pass through the detection point.

[0061] As an optional embodiment of the utility model, the detection system further comprises a first camera support, a second camera support and a light source support, the first area array camera 310 is arranged on the first camera support, the second area array camera 320 is arranged on the second camera support, and the light emitting device 200 is arranged on the light source support.

[0062] Preferably, the first area array camera 310 is adjustably arranged on the first camera support, the second area array camera 320 is adjustably arranged on the second camera support, and the light emitting device 200 is adjustably arranged on the light source support, so as to timely adjust the relative positions between the first area array camera 310, the second area array camera 320, the light emitting device 200 and the photovoltaic product sheet 10 to be detected, and ensure the accuracy of detecting the photovoltaic product sheet 10.

[0063] For the convenience of the technicians, the following provides the steps of installing and debugging the detection system when the detection system provided by an embodiment of the utility model is used to detect the quality of the photovoltaic product sheet 10:

[0064] Step 101, place the photovoltaic product sheet 10 on the carrier device 100;

[0065] Step 102, adjust the light emitting device 200 to a position where the distance between the light emitting device 200 and the detection point is within the optimal working distance range, and the light path of the first area array camera 310 and the second area array camera 320 is not blocked, and fix the light emitting device 200 on the light source support;

[0066] Step 103, determine the working distance of the first area array camera 310 according to the detection field of view, and after fixing the position of the first area array camera 310 on the first camera support, focus the first area array camera 310 to the clearest image;

[0067] Step 104, adjust the photographing field of view of the first area array camera 310 to coincide with the center of the laser spot until the image uniformity and brightness reach the best;

[0068] Step 105, refer to steps 103 and 104 to adjust the second area array camera 320 in the same way.

[0069] As an optional embodiment of the utility model, the light emitting device 200 comprises a plurality of laser light sources, the plurality of laser light sources are arrayed, and the laser light source is a vertical cavity surface emitting laser (VCSEL) light source, the laser of the VCSEL light source is emitted vertically to the top surface of the resonant cavity, and the light intensity and controllability of the VCSEL light source are better than those of the PL light source, the OS light source and other edge-emitting lasers, which can better ensure that the photographing device collects a clear image, and further ensure the detection accuracy.

[0070] As an optional embodiment of the utility model, the plurality of laser light sources are arranged in a rectangular array.

[0071] As an optional embodiment of the utility model, the plurality of laser light sources are arranged in a square array, and square light spots distributed in a rectangular array can be irradiated on the photovoltaic product sheet 10.

[0072] As an optional embodiment of the utility model, the laser light source of the light emitting device 200 can also be a common laser light source such as a photoluminescence (PL) light source or an OS light source.

[0073] To further ensure the detection accuracy of the photovoltaic product sheet 10, as a preferred embodiment of the utility model, as shown in Figure 1 The light emitting device 200 includes a light guide fiber 210 and a plurality of lamp beads 220, the plurality of lamp beads 220 correspond to the position of the incident end (i.e. the left end in the figure) of the light guide fiber 210, the light guide fiber 210 is used to conduct the light incident from the incident end to the exit end (i.e. the right end in the figure) thereof, so as to irradiate the photovoltaic product sheet 10, and the cross-sectional shape of the light guide fiber 210 is a polygon.

[0074] In the embodiment of the utility model, the incident end of the light guide fiber 210 is distributed with a plurality of lamp beads 220 for emitting light, and the exit end of the light guide fiber 210 is used to be arranged towards the photovoltaic product sheet 10, so that the light of the plurality of lamp beads 220 passes through the light guide fiber 210 and hits the photovoltaic product sheet 10, and the cross-sectional shape of the light guide fiber 210 is a polygon, so that the light emitted by the plurality of lamp beads 220 will occur multiple times of total reflection on the plurality of surfaces inside the light guide fiber 210, ensuring the uniformity of the exit light intensity of the light guide fiber 210, homogenizing the light irradiated on the surface of the photovoltaic product sheet 10, and further improving the imaging quality of the photographing device on the photovoltaic product sheet 10, avoiding problems such as overexposure due to too high brightness in the center of the image, low brightness around and unclearness, and further ensuring the detection accuracy of the photovoltaic product sheet 10.

[0075] As an optional embodiment of the utility model, the cross-sectional shape of the light guide fiber 210 is a rectangle.

[0076] In other embodiments of the utility model, the cross-sectional shape of the light guide fiber 210 is also a triangle, a trapezoid, a pentagon or other polygons.

[0077] As a preferred embodiment of the utility model, the lamp bead 220 is a vertical cavity surface emitting laser lamp bead.

[0078] As an optional embodiment of the utility model, the plurality of lamp beads 220 are arrayed.

[0079] As an optional embodiment of the utility model, the light emitting device 200 further comprises a packaging plate 221, and the plurality of lamp beads 220 are arrayed on the packaging plate 221.

[0080] Optionally, the material of the packaging plate 221 is copper, that is, the plurality of lamp beads 220 are arrayed and packaged on the copper plate to form an integrated light source (that is, a VCSEL-COB light source) with a high density of vertically resonant cavity surfaces radiating laser.

[0081] In order to ensure the light intensity on the surface of the photovoltaic product sheet 10, as a preferred embodiment of the utility model, the light emitting device 200 further comprises an end cap 230, the end cap 230 is made of transparent material, the first end of the end cap 230 is connected with the incident end of the light guide fiber 210, the second end of the end cap 230 is arranged opposite to the plurality of lamp beads 220, and the size of the end cap 230 gradually increases in the direction away from the incident end of the light guide fiber 210, so that the divergent light generated by the plurality of lamp beads 220 is shaped and converged by the end cap 230 and output to the incident end of the light guide fiber 210, thereby improving the light intensity output by the light guide fiber 210.

[0082] Optionally, the shape of the end cap 230 is pyramidal, for example, it can be conical or pyramidal.

[0083] Optionally, the first end of the end cap 230 is fusion connected with the incident end of the light guide fiber 210.

[0084] Optionally, the material of the end cap 230 is quartz material.

[0085] In order to ensure the overall structural stability of the detection system, as a preferred embodiment of the utility model, as shown in Figure 1 , the light emitting device 200 further comprises a fiber connector 240, and the fiber connector 240 is used to mount and connect the emitting end of the light guide fiber 210 with a fixing structure such as a bracket.

[0086] Optionally, the fiber connector 240 is made of metal material.

[0087] Optionally, the fiber connector 240 can adopt an SMA905 structure, or other types of fiber connectors can also be adopted.

[0088] As an optional embodiment of the utility model, the photographing device can be an industrial area array camera, which is used to collect infrared light emitted from the surface of the photovoltaic product sheet 10.

[0089] As an optional embodiment of the utility model, as shown in Figures 1 to 7 , the detection system further comprises at least one infrared lens (for example, it can comprise a first infrared lens 311 and a second infrared lens 321), the infrared lens is arranged on the light entering side of the photographing device, and the infrared lens can allow infrared light to pass through.

[0090] As an optional embodiment of the utility model, as shown in the figure, Figures 2 to 7 The detection system comprises a first infrared lens 311 and a second infrared lens 321, the first infrared lens 311 is arranged on the light inlet side of the first area array camera 310, and the second infrared lens 321 is arranged on the light inlet side of the second area array camera 320.

[0091] As an optional embodiment of the utility model, the transmittance of the first infrared lens 311 to light with a wavelength less than 808 nm is less than 0.01%, and the transmittance of the first infrared lens 311 to light with a wavelength greater than or equal to 1100 nm is greater than or equal to 95%; the transmittance of the second infrared lens 321 to light with a wavelength less than 808 nm is less than 0.01%, and the transmittance of the second infrared lens 321 to light with a wavelength greater than or equal to 1100 nm is greater than or equal to 95%, that is, the first infrared lens 311 and the second infrared lens 321 can be 808 nm cut-off, 1100 nm high-transmittance lenses.

[0092] The detection system provided by the utility model detects defects of photovoltaic product sheets based on the photoluminescence principle, that is, the photovoltaic product sheet 10 is made to emit light by the light emitting device 200, and the defects are identified by taking a photo of the photovoltaic product sheet 10 by the photo taking device. Moreover, the light emitting device 200 is a surface light source, and the photo taking device is an area array camera, so that when the photovoltaic product sheet 10 is detected, the light emitted by the light emitting device 200 irradiates and emits light on a region on the surface of the photovoltaic product sheet 10, and the photo taking device can also collect the image of the whole region on the surface of the photovoltaic product sheet 10 at one time, so that the surface defects of the photovoltaic product sheet (for example, the original silicon sheet) without an electronic device circuit, such as cracks, contamination, hidden cracks, scratches and the like, can be detected, and the whole surface light emitting state of the photovoltaic product sheet (for example, the battery sheet or the finished photovoltaic assembly produced by assembling the battery sheet and the like) with a circuit formed inside can be collected, so that the internal circuit defect such as short circuit can be intuitively identified.

[0093] The detection system provided by the utility model is suitable for various types of photovoltaic product sheets, and can identify the surface defects and circuit fault defects on the photovoltaic product sheet at one time, so that the adaptability of the detection system to different products to be detected is improved, the detection efficiency of the photovoltaic product sheet is ensured, and the production capacity and product yield of the photovoltaic product sheet are ensured.

[0094] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific embodiment. Any modification without deviating from the function and structural principle of the utility model will be included in the scope of claims.

Claims

1. A detection system comprising a light emitting device (200) for emitting a detection light to a photovoltaic product sheet (10) and at least one photographing device for photographing an area of the photovoltaic product sheet (10) illuminated by the detection light, characterized in that, The light emitting device (200) is a surface light source, and the photographing device comprises a first area array camera (310) and a second area array camera (320), which are respectively used for photographing the surfaces on both sides of the irradiated area of the photovoltaic product sheet (10).

2. The detection system of claim 1, wherein, The detection system further comprises a slide device (100) for fixing the photovoltaic product sheet (10).

3. The detection system of claim 2, wherein, The slide device (100) comprises a transmission guide rail (111) and a plurality of traveling assemblies (110) for fixing the photovoltaic product sheet (10). The plurality of traveling assemblies (110) are movably arranged on the transmission guide rail (111), and can move along the transmission guide rail (111) and stop moving when the position corresponds to the position of the photographing device, so that the photographing device photographs the photovoltaic product sheet (10).

4. The detection system according to any one of claims 1 to 3, characterized in that The light emitting device (200) comprises a plurality of laser light sources, and the plurality of laser light sources are arrayed.

5. The detection system according to any one of claims 1 to 3, characterized in that The light emitting device (200) comprises a light guide fiber (210) and a plurality of lamp beads (220), the plurality of lamp beads (220) correspond to the position of the incident end of the light guide fiber (210), the light guide fiber (210) is used for transmitting the light incident from the incident end to the exit end to irradiate the photovoltaic product sheet (10), and the cross-sectional shape of the light guide fiber (210) is polygonal.

6. The detection system of claim 5, wherein, The cross-sectional shape of the light guide fiber (210) is rectangular.

7. The detection system of claim 5, wherein, The light emitting device (200) further comprises an end cap (230) made of transparent material, the first end of the end cap (230) is connected with the incident end of the light guide fiber (210), the second end of the end cap (230) is arranged opposite to the plurality of lamp beads (220), and the size of the end cap (230) gradually increases in the direction away from the incident end of the light guide fiber (210).

8. The detection system of claim 5, wherein, The plurality of lamp beads (220) are arrayed.

9. The detection system according to any one of claims 1 to 3, characterized in that The detection system further comprises at least one infrared lens arranged on the light-incident side of the photographing device, and the infrared lens can allow infrared light to pass through.

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