CN103308491A - Multi-camera synchronously-tracked photoluminescence solar battery detecting device - Google Patents
Multi-camera synchronously-tracked photoluminescence solar battery detecting device Download PDFInfo
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- CN103308491A CN103308491A CN2013102170515A CN201310217051A CN103308491A CN 103308491 A CN103308491 A CN 103308491A CN 2013102170515 A CN2013102170515 A CN 2013102170515A CN 201310217051 A CN201310217051 A CN 201310217051A CN 103308491 A CN103308491 A CN 103308491A
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Abstract
The invention discloses an on-line solar battery detecting device based on photoluminescence images. The on-line solar battery detecting device comprises a laser light source and a data collection computer. A plurality of image collection modules (3) are installed on a movable table (5) making circular motion and are used for respectively collecting the photoluminescence images of every two adjacent solar battery pieces (2) on a production line, and the movable table (5) moves synchronously with the detected battery pieces (2), so that the image collection modules (3) are still relative to the solar battery pieces (2) in an exposure period, and the exposure time of cameras can be greatly prolonged while the operation speed of the production line is not lowered. A plurality of single-color large-power LED (light-emitting diode) illumination modules (4) are used for forming uniform radiation on the surfaces of the detected solar battery pieces, the produced irradiance is continuously adjustable within the standard solar irradiation range of 0 to 3AM1.5, and the wavelength of an irradiation light peak value is selectable in the range of 300nm to 750nm. The photovoltaic battery detecting device can be used for performing on-line synchronous detection on a silicon chip and a solar battery based on photoluminescence images under a general light condition.
Description
Technical field
The present invention relates to a kind of silicon chip, solar cell image detection device.Especially a kind of silicon chip, solar cell online detection instrument of following the tracks of synchronously based on photoluminescence fado gamma camera.
Background technology
The production run of solar cell relates to multiple working procedures such as section, making herbs into wool, diffusion, etching, plating antireflective film, wire electrode reticulated printing, sintering.The per pass operation all might be damaged silicon chip, forms substandard products.Therefore, be an important topic of photovoltaic industry in each production link fast detecting how.The photoluminescence detection method utilizes illumination to penetrate the photovoltaic cell material, and to high level, the high level electronics sends photon to the low-lying level transition with the electron excitation in the material, produces photoluminescence.Can obtain the minority carrierdiffusion length of material by the photoluminescence of observing material, surface resistance distributes, and the multiple information such as defective in the silicon chip are the strong instruments that carries out quality control in the manufacture of solar cells process.Photoluminescence method need not electrode, and is complete noncontacting measurement, brings any damage can for tested battery.Chinese invention patent application 200910046715.X " crackle detecting instrument for solar cell panel " discloses the instrument that a kind of solar cell photoluminescence that utilizes the laser scanning light source to produce detects the solar panel crackle.But slow because of sweep velocity, can't be applicable to the online detection of production line.Because photoluminescence intensity only be ten thousand of excitating light strength/even millions of/one, need time shutter of growing in order to obtain distinct image, be generally 1 second to tens seconds.According to the running speed of present manufacture of solar cells line, even adopt the sensitiveest CCD device also can't adapt to the travelling speed of production line.In order to satisfy the time shutter requirement of pick-up unit, avoid reducing the travelling speed of whole production line, Chinese invention patent application 201180012441.8 " irradiation system and the method that are used for the photoluminescence imaging of photovoltaic cell and wafer " discloses a kind of utilization and has produced the method for coming the fast detecting characteristic of solar cell greater than 6 standard solar irradiances in tested solar cell surface.But produce the technical barrier that high-intensity illumination like this need overcome many reality, patent itself does not provide concrete enforceable technical scheme yet.
At existing issue, the present invention realizes time exposure with the synchronous tracing of multiple-camera to silicon chip or the solar cell of fast moving on the travelling belt.Originally video camera is measured all silicon chips of process on the production line, and this invention then is that every video camera is only measured 1/N sheet silicon chip wherein.N is used shooting board number, and the time expand of exposing is directly proportional with the used board number that videotapes.Exciting light with common intensity shines down, does not reduce the quick online detection that the production line travelling speed can realize multiple parameters.
Summary of the invention
The ultimate principle that photoluminescence method detects characteristic of solar cell is in the optical radiation greater than the solar cell band-gap energy of solar cell or silicon chip surface illumination photons energy, for crystal silicon solar batteries, the laser light wavelength is generally less than 850nm, and the atom in the semiconductor material is energized into excited state from ground state.By detecting the quality that infrared radiation that atom produces from from excited state to ground state transition checks silicon chip and solar cell.Generally speaking, more strong representation silicon chip or Solar cell performance are more good for the photoluminescence that produces of identical excitation light intensity.The present invention aims to provide a kind of based on photoluminescence method, can be applicable to silicon chip and solar battery sheet on-line measuring device that continuous running production line is used.
In order to adapt to the needs of the production line that runs up, the technical scheme that the present invention has adopted multiple-camera to follow the tracks of collection synchronously.With general silicon chip, solar cell photoluminescence pick-up unit is the same, and this device comprises excitation source, ccd video camera, optical filter and data acquisition computer.For under the prerequisite that does not reduce the production line travelling speed, gather the photoluminescence image of different solar battery sheets respectively with multiple cameras.
The existing openly used method of scheme is to stand in the road limit with the automobile of running at high speed on the camera road, because have relative motion between automobile and the camera.For the image clapped keeps clear, the shutter speed of camera must be set very soon, this means that the time that CCD can expose is very short.Because photoluminescence itself is very faint, even best silicon ccd video camera also needs 1 second time shutter.In order to make checkout equipment not influence the running speed of production line, the method applied in the present invention be video camera is placed on and the car of the automobile constant velocity running that is taken on, follow the automobile that is taken and be synchronized with the movement.First video camera is with clapping the 1st car, and the 2nd video camera is with clapping the 2nd car, by that analogy.After the 1st the video camera exposure fully, turn back again with clapping N+1 car.N is total platform number of institute's input video camera.Prolonged the real exposure time of ccd video camera in this way greatly.The present invention is that 2 to 30 N platform image acquisition module (3) is installed on the transfer table (5) of a circulatory motion with the N span, gathers the photoluminescence image of the adjacent N sheet solar battery sheet (2) in position on the production line respectively.Transfer table (5) and detected solar battery sheet (2) transfer station (1) are though be one or be split that both moving directions and speed are synchronously strict, make image acquisition module (3) relative static with solar battery sheet (2) maintenance between exposure period.
The present invention adopts low price, and great power LED easy to use is as excitation source, and the peak wavelength of light source can be selected in the 300-750nm scope.At least 4 monochromatic high-power LED illumination modules (4) form uniform irradiation on the solar battery sheet surface, and the irradiance that produces is adjustable continuously in 0-3 AM1.5 standard sun scope.LED illumination module (4) can be fixedly mounted on the newel (6) of transfer table (5), and the optical axis direction outer incline of illumination module (4) evenly projects on the track that silicon chip moves light.The LED illumination module is rotated synchronously with transfer table, and each LED module can shine the tested solar cell of a slice separately like this, can reduce the use amount of LED illumination module like this, reduces heat radiation pressure.
Image acquisition module (3) used in the device is made up of greater than the long wave pass filter of 750nm CCD camera and cutoff wavelength.The effect of optical filter is to filter the exciting light that the LED illumination module is launched, and only allows the photoluminescence of tested battery be imaged on the CCD.The bright tested battery of the illumination that illumination module (4) is launched (2) also sends than the long infrared light photoluminescence of excitation light wave.Peak value is to arrive by ccd video camera (13) imaging after the photoluminescence of 1050nm passes long wave pass filter (14).And exciting light is short because of the wavelength ratio photoluminescence, is ended by long wave pass filter (14), can't arrive ccd video camera (13) imaging.
Illumination module (4) is made up of high-power monochromatic LED and even optical lens.Even optical lens is the free-form surface lens that optic polymer is made, can be according to irradiation distance, and the area of irradiating angle and tested solar cell evenly projects the light of LED on the tested battery sheet.In order to reach necessary radiation intensity, a slice 15 * 15cm
2Tested battery need the great power LED of 10-15 3W to shine approximately.
For effectively being electrically connected, the image acquisition module (3) that will rotate and static control computing machine (8), power supply can use the slip ring electrode.The slip ring electrode can keep electrically conducting when being implemented in the connecting line rotation.
Transfer table (5) and transfer station (1) can be made of one.The upper surface of transfer station (1) is established the solar battery sheet locating slot, makes the accurate positioning in rotary course of battery sheet.Face in the rotary drum side is provided with the importing of battery sheet, and export mouth (9) makes tested battery import pick-up unit successively, and derives after detection is finished, and comes back on the production line.
Also the motion track of transfer table (5) and the last solar battery sheet (2) of transfer station (1) can be designed to rectangle as required.If do not use the slip ring electrode, can make image acquisition module (3) that transfer table (5) go up to install except with transfer table (5) revolution, also after each public affairs circle, oppositely from the distortion of the elimination connecting line that circles.
The present invention is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is device side view of the present invention
Fig. 2 is device vertical view of the present invention
Fig. 3 is the structural representation of LED illumination module (4)
Fig. 4 is the structural representation of image acquisition module (3)
Embodiment
Provide specific embodiments of the invention below in conjunction with accompanying drawing, in order to architectural feature of the present invention, technical feature and function point to be described, but specific embodiments of the present invention is not limited in this embodiment.
Fig. 1, Fig. 2 are respectively the photoluminescence method silicon chip of multiple-camera of the present invention tracking synchronously, side view and the vertical view of solar cell on-line measuring device.For convenience of explanation, present embodiment has been installed 4 image acquisition modules (3).Image acquisition module transfer table (5) and tested solar cell (2) transfer station (1) design all-in-one-piece drum structure.Excitation source is for being the LED illumination module (4) of light-emitting component with high-power monochromatic LED.The concrete enforcement structure of module (4) as shown in Figure 3.Great power LED device (11) is welded on the metal-core printed circuit board MCPCB (12), can set up heat radiator as required in MCPCB (12) outside.Even optical lens (10) and LED (11) are fixed together by lens barrel (9) and form illumination module (4).Light-emitting component (11) is the U.S. Cree company high-power X-lamp LED of red 3W that produce, wavelength 660nm.Every table apparatus needs 4 illumination module (4) at least.Originally executing in the example, we are the illumination module (4) that 4 tested batteries dispose 12 3W respectively, form uniform irradiation on tested battery sheet surface, the irradiance that produces is adjustable continuously in 0-3 AM1.5 standard sun scope, as required, the peak wavelength of monochromatic irradiates light can be optional in the 300nm-750nm scope, the nearly 8-10 of selectable number of wavelengths.Image acquisition module (3) is formed (14) by ccd video camera and cutoff wavelength greater than the long wave pass filter of 750nm, as shown in Figure 4.Optical filter (14) is fixed on the outside of ccd video camera camera lens with screw thread.Data acquisition computer (8) is used for gathering solar cell photoluminescence image and system's control.The radiant illumination value that driving power (7) is used to illumination module (3) drive current to be provided and to adjust tested solar battery sheet surface by the size of control drive current.
The workflow of pick-up unit as shown in Figure 2, tested battery sheet (2) enters pick-up unit from the introducing port (9) in left side, and accurately rests in the locating slot of transfer station (1) upper surface.At this moment the optical axis of transfer table (5) epigraph collection module (3) can be realized consistent with the normal of tested solar cell central point.Transfer table (5) is structure as a whole with detected solar battery sheet (2) transfer station (1) and along clockwise rotating, during turning interior image acquisition module (4) solar battery sheet (2) keeps static relatively.The photoluminescence that silicon chip or solar cell are subjected to illumination to excite the back to produce sees through optical filter (14) and is received and deliver in the data acquisition computer (8) by CCD gamma camera (13).Be connected with the slip ring electrode between image acquisition module (3) and control computing machine (8) and the power supply, can reliably be connected between the image acquisition module (3) of assurance connecting line and rotation.After rotary drum turned over 3/4 circle, CCD gamma camera (13) exposure finished, and tested battery sheet (2) is from the battery sheet export mouth slice of Fig. 2 below, and tested battery comes back on the production line.The position of vacating after the slice can import the tested battery sheet of new a slice again.
Transfer table (5) and transfer station (1) also can the design mix body structures.Transfer station (1) can be utilized the part of line conveyor, and the motion track of solar battery sheet (2) is rectangle.
If do not use the slip ring electrode, going up the image acquisition module of installing (3) for the transfer table (5) that makes rotation is connected with fixing computing machine and CCD gamma camera power supply, can make image acquisition module (3) except revolving round the sun with transfer table (5), also after each public affairs circle, oppositely stubborn from the turning round of elimination connecting line of circling.
Claims (7)
1. a production line of being made up of excitation source, ccd video camera, optical filter, data acquisition computer is with solar cell photoluminescence pick-up unit, it is characterized in that: 2 to 30 image acquisition modules (3) are installed in one along on the transfer table (5) of the direction of transfer circulatory motion of transfer station (1), gather the photoluminescence image of the adjacent solar battery sheet (2) in position on the production line respectively; The transfer station (1) of transfer table (5) and tested solar battery sheet (2) is though be structure as a whole or for dividing body structure but strictly rotate synchronously, make image acquisition module (3) keep relative static with solar battery sheet (2) between exposure period; At least 4 monochromatic high-power LED illumination modules (4) form uniform irradiation on the solar battery sheet surface, and the irradiance that produces is adjustable continuously in 0-3 AM1.5 standard sun scope, and the irradiates light peak wavelength is optional in the 300nm-750nm scope.
2. pick-up unit according to claim 1, it is characterized in that: described image acquisition module (3) is made up of greater than the long wave pass filter (14) of 750nm CCD camera (13) and cutoff wavelength.
3. pick-up unit according to claim 1, it is characterized in that: described illumination module (4) is made up of high-power monochromatic LED (11) and even optical lens (10).
4. pick-up unit according to claim 1 is characterized in that: be connected by the slip ring electrode between image acquisition module (3) and computing machine (8) and the power supply.
5. pick-up unit according to claim 1, it is characterized in that: transfer table (5) and the tested battery transfer station (1) of described installation image acquisition module (3) are the rotary drum of one; The upper surface of transfer station (1) is provided with the solar battery sheet locating slot, and the rotary drum side is provided with the importing of battery sheet, export mouth (9).
6. pick-up unit according to claim 1 is characterized in that: it is consistent with the normal of tested solar battery sheet (2) central point that transfer table (5) epigraph is gathered the optical axis of module (3).
7. pick-up unit according to claim 1 is characterized in that: transfer table (5) is gone up the image acquisition module (3) installed except with transfer table (5) revolution, and is also after each public affairs circle, oppositely stubborn from the turning round of elimination connecting line of circling.
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Cited By (9)
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| CN103901335A (en) * | 2014-04-22 | 2014-07-02 | 哈尔滨工业大学 | Infrared polarization optical imaging detecting method and system for service life distribution of minority carriers of semi-conductor |
| CN105611263A (en) * | 2015-12-22 | 2016-05-25 | 广州视源电子科技股份有限公司 | Online adjusting method and system for white balance |
| CN108152304A (en) * | 2017-12-14 | 2018-06-12 | 上海海洋大学 | A kind of emitter-detector linkage detection device and method for the fish meat sheet containing bone |
| CN111829952A (en) * | 2020-08-13 | 2020-10-27 | 江南大学 | Silicon solar cell's section layering defect detection device that detects a flaw |
| CN111865215A (en) * | 2019-04-29 | 2020-10-30 | 北京铂阳顶荣光伏科技有限公司 | Detection device and method for solar cell |
| CN113340908A (en) * | 2021-07-30 | 2021-09-03 | 天津开发区精诺瀚海数据科技有限公司 | Rapid detection system for hub defects |
| WO2022082439A1 (en) * | 2020-10-20 | 2022-04-28 | 深圳市大疆创新科技有限公司 | Method and apparatus for time-lapse photographing of track, and gimbal camera, unmanned aerial vehicle, and handheld gimbal |
| CN115134536A (en) * | 2022-06-28 | 2022-09-30 | 维沃移动通信有限公司 | Shooting method and device thereof |
| US11722095B2 (en) | 2021-12-01 | 2023-08-08 | Zhejiang Jinko Solar Co., Ltd. | Method and apparatus for testing solar cell performance |
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| CN115134536A (en) * | 2022-06-28 | 2022-09-30 | 维沃移动通信有限公司 | Shooting method and device thereof |
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Application publication date: 20130918 |