CN101581770A - Method for testing lumen efficiency of LED lamps - Google Patents
Method for testing lumen efficiency of LED lamps Download PDFInfo
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- CN101581770A CN101581770A CNA2009100541849A CN200910054184A CN101581770A CN 101581770 A CN101581770 A CN 101581770A CN A2009100541849 A CNA2009100541849 A CN A2009100541849A CN 200910054184 A CN200910054184 A CN 200910054184A CN 101581770 A CN101581770 A CN 101581770A
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000011159 matrix material Substances 0.000 claims abstract description 69
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- 230000001052 transient effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 17
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
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- 238000010998 test method Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000005424 photoluminescence Methods 0.000 description 1
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources
- G01J2001/4252—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources for testing LED's
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Abstract
The invention provides a method for testing lumen efficiency of LED lamps, belonging to the measurement field. The method comprises the following steps: a lumen photoelectric detecting module with large area is constructed, the size or shape of which is the same as that of output window of a lamp so that output light of the LED lamp can directly irradiate on the matrix-type lumen photoelectric detecting module with large area; photocurrent/voltage output signal of each matrix unit photoelectric pickoff in matrix-type lumen photoelectric detecting module are scanned; photooptical data and total electric power consumption data of the LED lamps are input into a computer to carry out data accumulation and processing to obtain total luminous flux output by LED lamps and lumen efficiency thereof. The total luminous flux of the LED lamp output can be directly received, thus, the real-time measurement on the total luminous flux can be carried out, the response speed is fast, the test data has good repeatability, convenient operation and fast operation, compared with distribution photometer method, the equipment has low manufacturing cost, can be used in common laboratory, and can be widely used in testing fields of the energy conserving performance and luminous efficiency of various lamps.
Description
Technical field
The invention belongs to fields of measurement, relate in particular to the method for testing of optical devices such as a kind of LED of being used for light fixture.
Background technology
LED light fixture luminous efficiency (also claiming electrical efficiency) is to estimate the actual energy-conservation parameter of light fixture, is meant the total light flux of LED light fixture output and the ratio of gross electric capacity consumption, and its parameter unit is a lumens/watt.The key of this parameter testing is the total light flux of LED light fixture output is tested.
The test of light source output total light flux, the most frequently used method is to use the spheric photometer of being made up of various diameter integrating spheres, for example, the day for announcing is on April 8th, 2009, notification number is to disclose a kind of " adopting the LED luminous flux proving installation and the method for testing of arrow beam of light standard sources " in the Chinese invention patent of CN 100476389C, and it comprises optical fiber, spectrometer and the power supply of integrating sphere, light source, narrow clear aperature.Power supply is connected with light source and the some bright light source, arrow beam of light standard sources (luminous flux standard and spectroscopic standard light source) is placed the integrating sphere inside surface, no any blocking in the ball, optical fiber by narrow clear aperature will be guided to the miniature multi-channel spectral instrument by photometry, carry out spectral power distribution and test also and then calculate the method for luminous flux, realize precision measurement luminous flux.
And for example, open day is on May 13rd, 2009, publication number is to disclose a kind of " method of testing of the instantaneous luminous flux of LED and device under the PWM Driving technique " in the Chinese invention patent application of CN101430223A, and it also adopts the integrating sphere method that the luminous flux of LED to be measured is measured.
As seen, the test of the total light flux of in the prior art pointolite being exported has had the technical scheme of comparative maturity, but it can not be applied to the test of light fixture total light flux, because the caliber size of light fixture very big (corresponding point light source), and the profile of light fixture light stream output window is different.
In addition, in integration sphere light source system, exist than big-difference between the spectral distribution of LED product and spatial light intensity distribution and working standard lamp, can bring bigger measuring error.
At present, to the test of light fixture output total light flux, application distribution photometer method more generally, it has been listed in national optics dosage council specified test, and has some companies to produce distribution photometer products.
The measuring principle of distribution photometer is based on the measurement of light fixture direction luminous intensity, test data by light fixture all directions luminous intensity, through the total light flux data that space integral is calculated and the derivation light fixture is exported, in fact this is a kind of indirect space integral measuring method.
Distribution photometer system is not particularly limited profile, size and the beam angle of LED product, is very crucial but keep stable (in fact the relating to the stability of photoluminescence of light fixture) of LED product self temperature.
As seen, the measuring principle of distribution photometer, determined it not measure in real time to the light fixture total light flux, simultaneously, this measuring method all has very high requirement to operant level of precision, test environment and the tester of the stability of lamp luminescence, each moving component of test macro or the like.
In addition, distribution photometer cost height, test process is long, and experimental implementation condition harshness is repeatable poor, especially because the factors such as parasitic light that proving installation itself and test environment are produced can cause very big measuring error, is difficult to spread to common laboratory.
Summary of the invention
Technical matters to be solved by this invention provides a kind of LED light fixture method for testing lumen efficiency, it directly receives the total light flux of LED light fixture output, can measure in real time different bores, the different various LED light fixtures of window shape, its measuring system is cheap, response speed is fast, the favorable repeatability of test data, easy to operate, quick, spread to common laboratory easily.
Technical scheme of the present invention is: a kind of LED light fixture method for testing lumen efficiency is provided, comprises that the luminous flux to the output of LED light fixture detects, it is characterized in that:
A) make up a large-area matrix type lumen photodetection module/similar sizes identical or identical/similar shape, that constitute by tight arrangement of several pieces photodetectors with LED light fixture light output window;
B) at the light-receiving back side of each photodetector, temperature sensor is set;
C) make the light output direct irradiation of tested LED light fixture on above-mentioned large-area matrix type lumen photodetection module;
D) temperature signal of the photocurrent of each matrix unit photodetector or photovoltage output signal and each temperature sensor output in the scan matrix type lumen photodetection module;
E) the gross electric capacity consumption data input computing machine with photooptical data, temperature sensor data and the LED light fixture of above-mentioned each matrix unit carries out data processing;
F) add up by the photosignal data that each matrix unit photodetector is received, obtain the total light flux lumen of LED light fixture output:
G), can obtain the luminous efficiency of LED light fixture with of the gross electric capacity consumption of total light flux lumen divided by the LED light fixture.
Further, above-mentioned large-area matrix type lumen photodetection module directly receives the total light flux of LED light fixture output, can obtain the transient test data of the total lumen output of light fixture simultaneously.
Above-mentioned data processing matrix unit area dividing as required can obtain the near-field region distributed data that light fixture is exported light stream simultaneously.
The temperature sensor data of above-mentioned each matrix unit are used to show the temperature that also can control each matrix unit photodetector by air cooling equipment.
Concrete, the temperature signal of above-mentioned photocurrent or photovoltage output signal and each temperature sensor scans chronologically, reads by multichannel analog to digital conversion circuit or corresponding A/D conversion-single-chip microcomputer sensing circuit.
Front end in described large-area matrix type lumen photodetection module, the light fixture fringe radiation luminous flux collector of one toroidal is set, its inside surface is provided with the reflector layer of high reflectance, be used for the light stream that tested light fixture edge is dispersed is converged to matrix type lumen of light electric explorer, to reduce the loss of overflowing of tested light fixture edge light stream.
Above-mentioned large-area matrix type lumen photodetection module is closely arranged by the monocrystalline photodetector of two slices centimetres of magnitudes and constitute at least, be coated with luminosity function coupling light filter on its each sheet monocrystalline photodetector, coloured glass or resistant to elevated temperatures coloured polyester film that its luminosity function coupling light filter can adopt transmitted spectrum to be complementary, but also the applied optics film plating process is made.
Above-mentioned monocrystalline photodetector surfaces also is coated with neutral variable optical attenuator; Its neutral variable optical attenuator can adopt neutral light intensity attenuation glass or adopt the surface to have the high grid that absorbs the black paint proper density, but also the applied optics film plating process is made.
Above-mentioned each monocrystalline photodetector all passes through photoelectric characteristic test and lumen calibration test, and it has the photoelectric response rate of identical or uniformity.
Electrically insulated from one another between above-mentioned each matrix unit monocrystalline photodetector of matrix type lumen photodetection module.
Compared with the prior art, advantage of the present invention is:
1. the matrix type lumen photodetection module that adopts several pieces monocrystalline photodetectors to constitute, directly receive the total light flux of LED light fixture output, can measure in real time the light fixture total light flux, its response speed is fast, the favorable repeatability of test data, easy to operate, quick, compare with the distribution photometer method, its equipment manufacturing cost is cheap, spreads to common laboratory easily;
2. its large-area matrix type lumen photodetection module has identical/close size or identical/close shape with LED light fixture light output window, can realize the measurement to the different various LED light fixture correlation technique parameters of different bores even huge size, window shape;
3. applied range not only can be used for the test of LED light fixture, also applicable to the generally test of light fixture.
Description of drawings
Fig. 1 is a method of testing FB(flow block) of the present invention;
Fig. 2 is the formation synoptic diagram of test macro of the present invention;
Fig. 3 is a large-area matrix type lumen photodetection module cross-sectional view;
Fig. 4 is the planar structure synoptic diagram of large-area matrix type lumen photodetection module wiring board;
Fig. 5 is a light fixture output light stream near field distribution dividing region synoptic diagram.
1 is tested LED light fixture among the figure, 2 is light fixture fringe radiation luminous flux collector, and 3 is large-area matrix type lumen photodetection module, and 4 is temperature sensor, 5 and 6 is the circuit board of large-area matrix lumen of light electric explorer subassembly, 7 is air cooling equipment, and 8 is power supply, and 9 is computing machine, 21 is neutral variable optical attenuator, 22 are luminosity function coupling light filter, and 23 is the silicon single crystal photodetector, and 24 is substrate.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, this method for testing lumen efficiency comprises that the luminous flux to the output of LED light fixture detects, and its basic step comprises:
A) make up a large-area matrix type lumen photodetection module/similar sizes identical or identical/similar shape, that constitute by tight arrangement of several pieces photodetectors with LED light fixture light output window;
B) at the light-receiving back side of each photodetector, temperature sensor is set;
C) make the light output direct irradiation of tested LED light fixture on above-mentioned large-area matrix type lumen photodetection module;
D) temperature signal of the photocurrent of each matrix unit photodetector or photovoltage output signal and each temperature sensor output in the scan matrix type lumen photodetection module;
E) the gross electric capacity consumption data input computing machine with photooptical data, temperature sensor data and the LED light fixture of above-mentioned each matrix unit carries out data processing;
F) add up by the photosignal data that each matrix unit photodetector is received, obtain the total light flux lumen of LED light fixture output:
G), can obtain the luminous efficiency of LED light fixture with of the gross electric capacity consumption of total light flux lumen divided by the LED light fixture.
Its concrete computing method are as follows:
The total light flux lumen data F of LED light fixture output is the result of the photosignal data accumulation that receives by each matrix unit:
F＝∑Amn
Amn is the matrix unit of photodetector in the formula;
m＝1，2，3，...；
n＝1，2，3，...。
LED light fixture luminous efficiency (actual energy-conservation evaluating) η:
η=F/P (lumens/watt)
P is the gross electric capacity consumption of LED light fixture in the formula.
If do not consider the influence of temperature rise to measurement result, the thermometric correlation step in the above-mentioned steps is omissible in theory.
Because the total light flux lumen data of LED light fixture output are the results by the photosignal data accumulation of each matrix unit photodetector in the matrix type lumen photodetection module in this method of testing, thereby realized the real-time measurement of LED light fixture total light flux.
In addition, owing to be to adopt matrix type lumen of light electric explorer, then data processing matrix unit area dividing as required can obtain the near-field region distributed data that light fixture is exported light stream simultaneously.
The physical dimension that is adopted is the monocrystalline photodetector (monocrystalline photoelectric cell) of centimetre-sized, and its time response speed is in the millisecond magnitude, so can also obtain the transient test data shown in the total lumen of light fixture.
The temperature sensor data of above-mentioned each matrix unit are used to show the temperature that also can control each matrix unit photodetector by air cooling equipment.
Constituted large-area matrix type lumen photodetection module owing to adopting the multi-disc photodetector closely to arrange, so the size of matrix type lumen photodetection module is actually unconfined, so can realize measurement to the different various LED light fixture correlation technique parameters of different bores even huge size, window shape.
Among Fig. 2, the test macro that this method adopted comprises tested LED light fixture 1, light fixture fringe radiation luminous flux collector 2, large-area matrix type lumen photodetection module 3, temperature sensor 4, the circuit board 5 and 6 of large-area matrix lumen of light electric explorer subassembly, air cooling equipment 7, power supply 8, computing machine 9.
As seen from the figure, between the front end of tested LED light fixture and large-area matrix type lumen photodetection module, be provided with the light fixture fringe radiation luminous flux collector of a toroidal, its inside surface is provided with the reflector layer of high reflectance, be used for the light stream that tested light fixture edge is dispersed is converged to matrix type lumen of light electric explorer, to reduce the loss of overflowing of tested light fixture edge light stream.
The temperature sensor data of each matrix unit, can show in real time after the processing through circuit board 5 and 6/the data preservation, and can be by the running of control air cooling equipment, reduce the temperature rise of each matrix unit photodetector that light fixture energising work causes, make its working temperature stable, reduce test error because of temperature variation produced.
Because silicon single crystal photodetector responsiveness can reduce along with the rising of temperature, 1 ℃ of temperature variation, big appointment causes the variation of 0.1% sensitive detection parts photoelectric response rate, so should keep the temperature stabilization of matrix lumen of light electric explorer as far as possible.
In addition, the temperature signal of above-mentioned photocurrent or photovoltage output signal and each temperature sensor can scan chronologically by multichannel analog to digital conversion circuit or corresponding A/D conversion-single-chip microcomputer sensing circuit, and finish the A/D conversion, sends into computing machine and carries out data processing.
Power supply can adopt the digitizing power supply of high stability, and it to the light fixture power supply, directly sends the real time power consumption data of light fixture into computing machine on the one hand simultaneously.
Computing machine is responsible for reading, handle, control and/or showing of corresponding data.
Because the reading of the test of the photoelectric characteristic of silicon single crystal photodetector and lumen calibration test, photosignal and temperature signal, A/D signal transformation, temperature is controlled and the digital power of LED light fixture etc. is prior art, so its concrete connection line, principle of work or signal Processing/control procedure are no longer narrated at this.
Among Fig. 3, large-area matrix type lumen photodetection module is by the closely arrangement/splicing and constituting of the silicon single crystal photodetector 23 of at least two slices centimetres of magnitudes, and the gap of its splicing is less than 0.2mm.
On the surface of monocrystalline photodetector 23, cover and be provided with neutral variable optical attenuator 21, in order to adjust the light intensity of light fixture irradiation large-area matrix lumen photoelectric detector, make proving installation be in the linear work dynamic range; Its neutral variable optical attenuator can adopt neutral light intensity attenuation glass or adopt the surface to be coated with the grid that height absorbs the proper density of 3M black paint, but also the applied optics film plating process is made.
On each sheet monocrystalline photodetector 23, also cover and be provided with luminosity function coupling light filter 22, coloured glass or resistant to elevated temperatures coloured polyester film that its light filter can adopt transmitted spectrum to be complementary, but also the applied optics film plating process is made.
The monocrystalline photodetector of above-mentioned each unit all will make it have the photoelectric response rate of identical or uniformity through photoelectric characteristic test and lumen calibration test.
The size of the quantity of matrix type lumen of light electrical resistivity survey measurement unit (being the quantity of silicon single crystal photodetector), required splicing area, corresponding with tested light fixture light output window, also can make local light output window size greater than tested light fixture.
The monocrystalline photodetector is arranged on the substrate 24, and temperature sensor 4 is used to detect the temperature of matrix lumen of light electric explorer.
Mutual electrical insulation between each matrix unit of above-mentioned matrix photodetection module.
Because silicon single crystal photodetector, neutral variable optical attenuator, luminosity function coupling light filter, photoelectric characteristic test and lumen calibration test are prior art, so no longer describe in detail.
It shown in Fig. 4 the wiring board of large-area matrix photodetection module, it is attached to and is labeled as among Fig. 3 on 24 the substrate, what provide among this figure is 8 * 15 matrixes, the size of matrix need be determined according to the principle of " size of required area; corresponding with tested light fixture light output window also can make local light output window size greater than tested light fixture " during actual the use.
Fig. 5 has provided the march into the arena division of distributed areas of light fixture output light stream, is example shown in scheming, and is described further:
(1) light fixture output total light flux test:
F＝∑Amn
Amn is the matrix unit of photodetector in the formula;
m＝1，2，3，...8
n＝1，2，3，...15
(2) light fixture output near field light stream areal distribution test:
(1) central area:
F
0＝∑Amn
m＝4，5
n＝6，7，8，9，10
(2) external zones:
F
2＝∑
1Amn+∑
2Amn+∑
3Amn+∑
4Amn
Wherein:
∑
1Amn m＝2，3，4，5，6，7 n＝3，4，5
∑
2Amn m＝2，3，4，5，6，7 n＝11，12，13
∑
3Amn m＝2，3 n＝6，7，8，9，10
∑
4Amn m＝6，7 n＝6，7，8，9，10
(3) marginarium:
F
3＝∑′
1Amn+∑′
2Amn+∑′
3Amn+∑′
4Amn
Wherein:
∑′
1Amn m＝1，2，3，4，5，6，7，8 n＝1，2
∑′
2Amn m＝1，2，3，4，5，6，7，8 n＝1，2
∑′
3Amn m＝1 n＝1，2，3，…15
∑′
4Amn m＝8 n＝1，2，3，…15
From foregoing description as can be seen, because the present invention can carry out cutting apart refinement and can measure/comment each unit of cutting apart refinement separately to the whole light-emitting zone of light fixture, so survey its light distribution situation for the light fixture separated regions of different purposes, this is the application of an initiative.
For example, to being used for the light fixture under the concentrated illumination occasion of requirement, can detect the near field distribution situation of its light intensity, to being used to disperse illumination or requiring light fixture under the balanced illumination occasion, the far-field distribution situation of its light intensity can be surveyed, for some special-purpose or be applicable to the light fixture of specific occasion, even the light distribution situation of certain or some appointed areas can be measured, pass judgment on for the detection and the performance of various different purposes light fixtures, brought a kind of brand-new means of testing and assessment method.
Should be noted that disclosing of the foregoing description and data, be in order to help to increase understanding, and should do not regard limitation of the invention or restriction as technical solution of the present invention.
Those of ordinary skill in the art; after understanding and having grasped basic invention thinking of the present invention; fully can be without performing creative labour; on the basis of technical scheme disclosed in this invention; make various that be equal to or similar technical schemes, that these are equal to or similar technical scheme also should be regarded the scope that the present invention is claimed as.
The present invention can be widely used in the field tests of the energy-efficient performance/luminescence efficiency of various light fixtures.
Claims (10)
1. a LED light fixture method for testing lumen efficiency comprises that the luminous flux to the output of LED light fixture detects, and it is characterized in that:
A) make up a large-area matrix type lumen photodetection module/similar sizes identical or identical/similar shape, that constitute by tight arrangement of several pieces photodetectors with LED light fixture light output window;
B) at the light-receiving back side of each photodetector, temperature sensor is set;
C) make the light output direct irradiation of tested LED light fixture on above-mentioned large-area matrix type lumen photodetection module;
D) temperature signal of the photocurrent of each matrix unit photodetector or photovoltage output signal and each temperature sensor output in the scan matrix type lumen photodetection module;
E) the gross electric capacity consumption data input computing machine with photooptical data, temperature sensor data and the LED light fixture of above-mentioned each matrix unit carries out data processing;
F) add up by the photosignal data that each matrix unit photodetector is received, obtain the total light flux lumen of LED light fixture output:
G), can obtain the luminous efficiency of LED light fixture with of the gross electric capacity consumption of total light flux lumen divided by the LED light fixture.
2. according to the described LED light fixture of claim 1 method for testing lumen efficiency, it is characterized in that described large-area matrix type lumen photodetection module directly receives the total light flux of LED light fixture output, can obtain the transient test data of the total lumen output of light fixture simultaneously.
3. according to the described LED light fixture of claim 1 method for testing lumen efficiency, it is characterized in that described data processing matrix unit area dividing as required, can obtain the near-field region distributed data of light fixture output light stream simultaneously.
4. according to the described LED light fixture of claim 1 method for testing lumen efficiency, it is characterized in that the temperature sensor data of described each matrix unit, be used to show and can control the temperature of each matrix unit photodetector by air cooling equipment.
5. according to the described LED light fixture of claim 1 method for testing lumen efficiency, the temperature signal that it is characterized in that described photocurrent or photovoltage output signal and each temperature sensor scans chronologically, reads by multichannel analog to digital conversion circuit or corresponding A/D conversion-single-chip microcomputer sensing circuit.
6. according to the described LED light fixture of claim 1 method for testing lumen efficiency, it is characterized in that front end in described large-area matrix type lumen photodetection module, the light fixture fringe radiation luminous flux collector of one toroidal is set, its inside surface is provided with the reflector layer of high reflectance, be used for the light stream that tested light fixture edge is dispersed is converged to matrix type lumen of light electric explorer, to reduce the loss of overflowing of tested light fixture edge light stream.
7. according to the described LED light fixture of claim 1 method for testing lumen efficiency, it is characterized in that described large-area matrix type lumen photodetection module closely arranged by the monocrystalline photodetector of two slices centimetres of magnitudes and constitute at least, be coated with luminosity function coupling light filter on its each sheet monocrystalline photodetector, coloured glass or resistant to elevated temperatures coloured polyester film that described luminosity function coupling light filter can adopt transmitted spectrum to be complementary, but also the applied optics film plating process is made.
8. according to the described LED light fixture of claim 7 method for testing lumen efficiency, it is characterized in that described monocrystalline photodetector surfaces also is coated with neutral variable optical attenuator; Described neutral variable optical attenuator can adopt neutral light intensity attenuation glass or adopt the surface to have the high grid that absorbs the black paint proper density, but also the applied optics film plating process is made.
9. according to the described LED light fixture of claim 7 method for testing lumen efficiency, it is characterized in that described each monocrystalline photodetector all passes through photoelectric characteristic test and lumen calibration test, it has the photoelectric response rate of identical or uniformity.
10. according to the described LED light fixture of claim 7 method for testing lumen efficiency, it is characterized in that electrically insulated from one another between described each matrix unit monocrystalline photodetector of matrix type lumen photodetection module.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072811A (en) * | 2009-11-20 | 2011-05-25 | 广镓光电股份有限公司 | Optical detection device and detection method by applying same |
| CN102507150A (en) * | 2011-10-20 | 2012-06-20 | 上海太阳能电池研究与发展中心 | On-line real-time detection device of optical parameters, color parameters and electrical parameters of light emitting diode (LED) lamp |
| CN103018256A (en) * | 2012-12-13 | 2013-04-03 | 清华大学深圳研究生院 | LED (light-emitting diode) defect detecting system |
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