CN101676684A - Optical detection system and method for detecting solar cells - Google Patents
Optical detection system and method for detecting solar cells Download PDFInfo
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- CN101676684A CN101676684A CN200810149647A CN200810149647A CN101676684A CN 101676684 A CN101676684 A CN 101676684A CN 200810149647 A CN200810149647 A CN 200810149647A CN 200810149647 A CN200810149647 A CN 200810149647A CN 101676684 A CN101676684 A CN 101676684A
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Abstract
The invention relates to an optical detection system and method for detecting solar cells, which is mainly used for confirming the edge position of the resin-coated substrate on the solar cell. The method includes irradiating the back side of the solar cell with oblique solar light by light source equipment, receiving reflection light with an image sensor so as to measure the grey scale value of the solar cell, comparing the difference between grey scale values of the solar cell afterwards, and determining the area as the edge of the resin-coated substrate by a processing unit when the difference between the average grey scale value of the area and the average grey scale value of the adjacent area exceeds the threshold of the pre-storage. The system and the method can be applied to the displacement detection of the resin-coated substrate on the solar cell.
Description
Technical field
The present invention refers in order to detect the optical detection system and the method for solar cell especially about a kind of optical detection system and method.
Background technology
In today that earth energy is petered out, solar cell becomes the energy products new lover of a new generation, and the current conversion efficiency that still belongs to the silicon wafer solar cell is preferable.With the solar cell of silicon wafer, comprise photoinduction layer and gum substrate that smectic phase changes on the solar battery structure, visiblely on the photoinduction laminar surface be the silicon wafer of tool color and the lead that is printed on the silicon wafer surface.Because the lattice of silicon wafer is wayward, particularly polysilicon is more complicated, seems the homochromy of the mottled different depths by seeing in appearance.
Detect (Automated Optical Inspection with automated optical; When AOI) detecting solar cell, with the front lighting irradiation, image taking sensor receives the shade of gray value that reflected light records determinand more traditionally.
For example, make the gum substrate when the offset detection of photoinduction layer back surfaces, must determine the gum substrate boundaries in advance, yet when shining with front lighting, often the location is not good because the variation of gum substrate boundaries shade of gray value is not obvious, and the solar cell of polysilicon is quite general especially recently, and the change color of polysilicon lattice makes positive light-struck check more difficult, automated optical in the past detects and detects with front lighting, can't address this problem at all.
Therefore, fundamental purpose of the present invention is to provide a kind of in order to detect the optical detection system and the method for solar cell, to improve the problems referred to above.
Summary of the invention
Purpose of the present invention is providing a kind of in order to detect the optical detection system and the method for solar cell, can orient the border of gum substrate on the photoinduction layer back side, with offset detection foundation as the gum substrate, like this, can confirm on the solar cell as the gum substrate boundaries with quick efficient method.
For achieving the above object, the invention provides a kind of optical detection system, in order to confirm the detection target on this solar cell in order to the detection solar cell.This optical detection system comprises a light source, an imageing sensor, a storage unit and a processing unit.
This light source with this solar cell of oblique irradiate light to produce reflected light.This imageing sensor receives reflected light to record the shade of gray value of this solar cell.The pre-storage of this storage unit one threshold value.
This processing unit is in order to the contrast of the shade of gray value of comparing this solar cell, when the contrast of the average shade of gray value of the average shade of gray value in a zone and adjacent area surpassed the threshold value of pre-storage, this processing unit judged that this zone is the margin of uplift of this gum substrate above the photoinduction layer back side.
Beneficial effect of the present invention is, the present invention is in order to detect the optical detection system and the method for solar cell, utilize the contrast of skew ray and the average shade of gray value of institute's sensing, can orient the border of gum substrate on the photoinduction layer back side, with foundation as gum substrate offset detection.Like this, can confirm on the solar cell as the gum substrate boundaries with quick efficient method.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 cuts open synoptic diagram for the outward appearance and the side of solar cell among the present invention;
Fig. 2 is the synoptic diagram of optical detection of the present invention system place automated test device;
Fig. 3 is the side cut-away view of optical detection of the present invention system;
Fig. 4 is the function block diagram of optical detection of the present invention system;
Fig. 5 is the synoptic diagram that detects target for the margin of uplift with the gum substrate;
Fig. 6 is the process flow diagram of optical detecting method of the present invention.
Wherein, Reference numeral
Sorting device 26 storage boxes 27
Following light source module 3004 skew ray source modules 3006
Gum substrate edges 70
Embodiment
The outward appearance and the side that see also solar cell 10 among Fig. 1 the present invention are cutd open synoptic diagram.The present invention be directed to the detection of solar cell 10, by sectional side view as seen, solar cell 10 upper and lower being coincided by a photoinduction layer 12 and a gum substrate 14 form, the area of gum substrate 14 is little and be located on photoinduction layer 12 back side than photoinduction layer 12, and, gum substrate 14 high rising on photoinduction layer 12 back side.
To face outside drawing as seen, face photoinduction layer 12 with projecting direction, further comprise a conductor area 1202 and a silicon wafer zone 1204, no matter be polysilicon or mono-crystalline structures, the color in silicon wafer zone 1204 is skewness often, and being needs suitable technological means to carry out optical detection at solar cell 10 automatically.
See also the synoptic diagram of Fig. 2 optical detection of the present invention system 23 place automated test devices 20.Optical detection system 23 is arranged in the automated test device 20; The leading portion of automated test device 20 is for advancing sheet equipment 22, this advances sheet equipment 22 except solar cell 10 being advanced sheet on the conveying belt 21, be provided with an optical detection system 23 in the bottom, according to the flaw of establishing and detect gum substrate 14 surfaces, solar cell 10 back.
The stage casing of automated test device 20 is provided with optical detection system 23 for detecting main equipment 24 above conveying belt 21, can be used for detecting the surface of solar cell 10 front lighting inductive layers 12.
The back segment of automated test device 20 is a sorting device 26, in the both sides of conveying belt 21 many storage boxes 27 are arranged, to flaw and flawless solar cell 10 be arranged after the go-on-go, transport and in the different storage box 27 that is placed in, make things convenient for shipment for follow-up with mechanical arm 28.
See also the side cut-away view of Fig. 3 optical detection of the present invention system 23.The present invention is about a kind of optical detection system 23, in order to confirm the boundary position of gum substrate 14 on the solar cell 10.Optical detection system as seen from Figure 3 23 comprises a light source 30 and an imageing sensor 32.
Last light source module 3002 and following 3004 pairs of solar cells of light source module 10 produce front lightings, skew ray source module 3006 comprises four light source assembly 3006A that distribute with respect to solar cell 10 four-ways, in order to solar cell 10 is produced the light source assembly 3006A of oblique light.
These light source assemblies 3006A of skew ray source module 3006 is located at the different azimuth of relative solar cell 10, further specify, these two relative light source assembly 3006A are one group of light source module, two groups of light source modules are arranged altogether, these two groups of light source modules in regular turn to solar cell 10 back side illuminaton skew rays to detect solar cell 10, so that solar cell 10 is produced multidirectional skew ray.So, being combined into required light by above-mentioned these light source modules, some provides light source module that front lighting is provided, and some light source module provides skew ray, and some light source module provides light to come filtering noise.
Cooperate Fig. 3 further to see also Fig. 4, Fig. 4 is the function block diagram of optical detection of the present invention system 23.Optical detection system 23 more comprises a storage unit 36 and a processing unit 34 except an aforesaid light source 30 and an imageing sensor 32.
For example, threshold value 3602 is " 100 ", and the average shade of gray value in a small size zone is " 223 ", and expression is subjected to irradiate light and directly reflective, the meaning be exactly this be sensitive surface with height.The average GTG value in other zone is " 78 ", then the contrast of the average shade of gray in the average shade of gray value in small size zone and other zone is " 145 ", " 100 " bottom line that has surpassed threshold value 3602 is so optical detection system 23 promptly judges this small size zone really for having the sensitive surface of height.
Seeing also Fig. 5 serves as the synoptic diagram that protuberance detects target with gum substrate 14 edges 70.The detection target of described protuberance is the edge 70 of gum substrate 14 in the present invention, makes follow-uply can do the offset detection of gum substrate 14 on photoinduction layer 12 according to 70 positions, edge of gum substrate 14.Particularly at polysilicon solar cell 10, because the shade of gray value that the lattice confusion is presented is also chaotic, can not find this edge edge 70 with front lighting at all, because the gum substrate 14 and the photoinduction layer 12 of photoinduction layer 12 back surfaces have difference in height, this is the reason that skew ray could produce obvious contrast, therefore also can find the border of gum substrate 14 clearly, whether follow-up providing to detect gum substrate 14 is offset and is arranged on the photoinduction layer 12.
At the affirmation on gum substrate 14 borders, can assist with the area or the geometric configuration in zone and recognize, more can confirm whether be the border of gum substrate 14.
See also the process flow diagram of Fig. 6 optical detecting method of the present invention.The present invention also is a kind of in order to detect the optical detecting method of solar cell 10, and in order to confirm the edge 70 of gum substrate 14 on the solar cell 10, this optical detecting method comprises the following step:
Step S02: with an oblique irradiate light solar cell 10 to produce reflected light.
Step S04: receive reflected light to record the shade of gray value of solar cell 10.
Step S06: the contrast of shade of gray value of comparison solar cell 10, whether the average shade of gray value of judging a zone surpasses the threshold value 3602 that stores up in advance with the contrast of the average shade of gray value of adjacent area.
Step S08: when the contrast of the average shade of gray value of the average shade of gray value in a zone and adjacent area surpasses the threshold value 3602 of pre-storage, judge that this zone is the edge 70 that swell at gum substrate 14 relative photoinduction layers 12 back side.
Wherein, this detection target can be the edge 70 of gum substrate 14, makes follow-uply can do the offset detection of gum substrate 14 on photoinduction layer 12 back side according to 70 positions, edge of gum substrate 14.
Therefore, by optical detection system 23 and the method for the present invention in order to detection solar cell 10, utilize the contrast of skew ray and the average shade of gray value of institute's sensing, can orient the edge 70 of gum substrate 14 on photoinduction layer 12 back surfaces, with foundation as gum substrate 14 offset detection.Like this, can confirm on the solar cell 10 as gum substrate 14 borders with quick efficient method.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (8)
1, a kind of in order to detect the optical detection system of solar cell, this solar cell comprises the photoinduction layer and the gum substrate of stacking setting, this optical detection system is characterized in that in order to confirm the marginal position of this gum substrate on this solar cell this optical detection system comprises:
One light source, with this solar cell of oblique irradiate light to produce reflected light;
One imageing sensor receives reflected light to record the shade of gray value of this solar cell;
One storage unit is stored up a threshold value in advance; And
One processing unit is compared the contrast of the shade of gray value of this solar cell, and when the contrast of the average shade of gray value of the average shade of gray value in a zone and adjacent area surpassed the threshold value of pre-storage, this processing unit was judged the edge of this zone for this gum substrate.
2, the optical detection system in order to the detection solar cell according to claim 1 is characterized in that the area of this gum substrate is little than this photoinduction layer, and follow-up marginal position according to this gum substrate is done offset detection.
3, according to claim 2 in order to detect the optical detection system of solar cell, it is characterized in that, it is two groups of light source modules that this light source comprises four light source assemblies that distribute with respect to this solar cell four-way, wherein these two relative light source assemblies are one group of light source module, and these two groups of light source modules shine skew ray to detect this solar cell to this solar cell in regular turn.
4, according to claim 3 in order to detect the optical detection system of solar cell, it is characterized in that this solar cell is a polysilicon solar cell.
5, a kind of in order to detect the optical detecting method of solar cell, this solar cell comprises the photoinduction layer and the gum substrate of stacking setting, this optical detecting method is in order to confirm the marginal position of this gum substrate on this solar cell, it is characterized in that this optical detecting method comprises the following step:
With this solar cell of oblique irradiate light to produce reflected light;
Receive reflected light to record the shade of gray value of this solar cell; And
Compare the contrast of the shade of gray value of this solar cell, when the contrast of the average shade of gray value of the average shade of gray value in a zone and adjacent area surpasses the threshold value of pre-storage, judge the edge of this zone for this gum substrate.
6, the optical detecting method in order to the detection solar cell according to claim 5 is characterized in that the area of this gum substrate is little than this photoinduction layer, and follow-up marginal position according to this gum substrate is done offset detection.
7, according to claim 6 in order to detect the optical detecting method of solar cell, it is characterized in that, four light sources that have in this solar cell four-way are two groups of light sources, wherein these two relative light sources are one group, and these two groups of light sources shine skew ray to detect this solar cell to this solar cell in regular turn.
8, according to claim 7 in order to detect the optical detecting method of solar cell, it is characterized in that this solar cell is a polysilicon solar cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810149647A CN101676684A (en) | 2008-09-16 | 2008-09-16 | Optical detection system and method for detecting solar cells |
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| CN200810149647A CN101676684A (en) | 2008-09-16 | 2008-09-16 | Optical detection system and method for detecting solar cells |
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| CN101676684A true CN101676684A (en) | 2010-03-24 |
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| CN200810149647A Pending CN101676684A (en) | 2008-09-16 | 2008-09-16 | Optical detection system and method for detecting solar cells |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215182A (en) * | 2014-09-09 | 2014-12-17 | 深圳市斯尔顿科技有限公司 | Lithium battery winding layer border offset detecting method |
| CN107610090A (en) * | 2017-07-15 | 2018-01-19 | 河北工业大学 | A kind of detection algorithm of photovoltaic cell surface grid line skew |
| CN110164788A (en) * | 2018-02-14 | 2019-08-23 | 特铨股份有限公司 | Optical detection apparatus and its light source Xun Bian mechanism |
-
2008
- 2008-09-16 CN CN200810149647A patent/CN101676684A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215182A (en) * | 2014-09-09 | 2014-12-17 | 深圳市斯尔顿科技有限公司 | Lithium battery winding layer border offset detecting method |
| CN107610090A (en) * | 2017-07-15 | 2018-01-19 | 河北工业大学 | A kind of detection algorithm of photovoltaic cell surface grid line skew |
| CN107610090B (en) * | 2017-07-15 | 2020-09-18 | 河北工业大学 | Method for detecting grid line deviation on surface of photovoltaic cell |
| CN110164788A (en) * | 2018-02-14 | 2019-08-23 | 特铨股份有限公司 | Optical detection apparatus and its light source Xun Bian mechanism |
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Open date: 20100324 |