CN102707212A - Device for detecting service life of light emitting diode (LED) in real time - Google Patents

Device for detecting service life of light emitting diode (LED) in real time Download PDF

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Publication number
CN102707212A
CN102707212A CN2011103329939A CN201110332993A CN102707212A CN 102707212 A CN102707212 A CN 102707212A CN 2011103329939 A CN2011103329939 A CN 2011103329939A CN 201110332993 A CN201110332993 A CN 201110332993A CN 102707212 A CN102707212 A CN 102707212A
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CN
China
Prior art keywords
light
led
supporting base
time detection
light transmission
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CN2011103329939A
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Chinese (zh)
Inventor
牟同升
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杭州浙大三色仪器有限公司
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Priority to CN2011103329939A priority Critical patent/CN102707212A/en
Publication of CN102707212A publication Critical patent/CN102707212A/en

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Abstract

The invention relates to a device for detecting the service life of a light emitting diode (LED) in real time. The device comprises a temperature control box, a supporting base and light transmission devices which are arranged in the temperature control box, and a light measuring apparatus which is connected with measuring ends of the light transmission devices, wherein the other end of each light transmission device is an acquisition end; and the acquisition ends are matched with the supporting base. The device is characterized by also comprising light collectors with light inlet windows and light outlet windows, wherein the acquisition ends of the light transmission devices are connected to the light outlet windows of the light collectors; and the supporting base is matched with the light inlet windows on the light collectors. The device has the excellent characteristics that 1, the luminous power or the luminous flux of an LED sample at certain working temperature can be measured directly by the light measuring apparatus and a temperature measuring apparatus, so that automatic control can be realized, repetitive manual operation is not needed, measurement errors are reduced, and measurement accuracy is improved; and 2, as the light collectors (such as light integrating balls) are used for acquiring light sources, the detection result is difficultly influenced by samples aside, and the service life of an LED product can be predicated accurately.

Description

LED life-span real-time detection apparatus
Technical field
The invention belongs to the field tests of light emitting semiconductor device LED product, relate in particular to a kind of LED life-span real-time detection apparatus.
Background technology
LED is a kind of light emitting semiconductor device that can electric energy be converted into luminous energy; Compare with halogen tungsten lamp with the incandescent lamp that general lighting is used; Owing to plurality of advantages such as its energy-saving and environmental protection, life-span length, fast, the anti-switching surge of response, easy luminous intensity distribution enjoy favor; It is used just from nightscape lighting, LCD TV backlight, progressively is penetrated into the general lighting field.
The life detecting method of conventional light source is with test products actual lighting under its normal running conditions, calculates its life-span according to its light decay or out-of-service time.Because life-span of light emitting semiconductor device is generally very long, all be nominally at more than tens thousand of hours like in the market LED life of product, so traditional detection method just is not suitable for practical operation and application.
At present; The life-span of LED product also has adopts accelerated test to test the method for its performance; Like working temperature, quicken its aging (light decay, inefficacy) process, and in this process, measure effective expected life that its correlation parameter calculates light emitting semiconductor device through the rising device.On the practical manner,, take out test device at set intervals, measure its luminous power or luminous flux,, extrapolate its life-span under normal operation according to the pad value of luminous power after the hot test or luminous flux through the LED device is placed high-temperature test chamber.Owing to test after the method needs repeated multiple times from chamber, to take out, lower the temperature, complicated operation is inconvenient again, and repeatedly heats up and cooling can be introduced many uncertain factors, influences the accuracy of test result.
Also have in the existing disclosed data to introduce and adopt fiber optic receiver; The luminous parameters of experiment with measuring sample under real-time trystate; Because different luminophors have different beam angles; Can not gather different luminophor emitted light beams fully and the light probe on the fiber optic receiver is less, cause reflecting fully the truth of test specimen, accuracy of detection is low.
Summary of the invention
The objective of the invention is to solve the problems referred to above of prior art existence and a kind of LED life-span real-time detection apparatus is provided, with the purpose that reaches fast, detection obtains the life-span of LED product accurately.
Above-mentioned technical purpose of the present invention mainly solves through following technical scheme: LED life-span real-time detection apparatus; Comprise temperature control box; Be located at supporting base and light transmission in the temperature control box, with the photometer that the measuring junction of light transmission is connected, the other end of said light transmission is a collection terminal; Collection terminal and supporting base are equipped with; It is characterized in that also comprising the light collector with light portal and light-emitting window, the collection terminal of said light transmission is connected the light-emitting window place on the light collector, and described supporting base cooperates with light portal on the light collector.Light collector is the adjustable optical receiver of a kind of light beam acceptance angle; Photometer can be spectrometer or photometer; Light transmission can be resistant to elevated temperatures light beam transmission apparatus such as optical fiber or lens, and the one of which end links to each other with light collector, and the other end is connected with photometer.This connection mainly is that light transmission connects.During test, place on the supporting base LED test specimen and power supply, the temperature of control temperature control box, the light that test specimen sent is transferred to photometer through light transmission after being gathered by light collector; Optical receiver and the distance between the test specimen in the light collector can be adjusted; Regulate the light beam acceptance angle according to the angle of test specimen emitted light; The benefit of this structure is that photometer can be measured the light that the whole test sample is sent, and helps improving measuring accuracy.
In addition, light collector and light transmission are corresponding one by one, and photometer can receive the signal input of one or more light transmissions.
As to further the improving and replenishing of technique scheme, the present invention adopts following technical measures: described supporting base can cooperate with light portal on the light collector in activity.The movable purpose that cooperates is: the light that light collector can adopt the whole test sample to be sent, and then make photometer can measure the light that the whole test sample is sent.According to the angle that the beam angle of test specimen emitted light is regulated the light portal receiving beam, test specimen can be placed in light portal below or flush position (being primarily aimed at the little situation of beam angle), the light integrating sphere of light integrating sphere (to the big situation of beam angle).
Described light collector is an integrating sphere, and nearly light-emitting window place is provided with first baffle plate in its inner chamber.The setting of first baffle plate, its purpose are to prevent light direct projection that test specimen sends to light transmission, after baffle plate stops, go into light transmission through the light collector diffuse reflection is laggard again.Integrating sphere has the mixed light function, and the light that the whole test sample is sent helps making measuring-signal even through light integrating sphere mixed light, improves measuring accuracy.
Lower Half in the inner chamber of said integrating sphere also is provided with the self calibration light source, and said self calibration light source next door is provided with one second baffle plate.Along with the growth of service time, influenced by dust, moisture etc., the reflectivity of light collector inwall can reduce, and loosening situation also takes place in light transmission easily, and the measuring accuracy of light collector can reduce.Therefore, the self calibration light source is set, it is mainly tungsten lamp, and corresponding baffle plate also is equipped with on next door, self calibration light source calibration lamp source.In use, regularly make the self calibration light source luminescent, the measuring accuracy of light collector is calibrated, and light collector is safeguarded, help the collection of light signal, improve measuring accuracy.The light that is provided for that the self calibration light source is launched of second baffle plate can not directly pass light-emitting window and the direct projection of integrating sphere to light transmission.
The internal coating of said smooth integrating sphere is by barium sulphate or magnesium oxide or teflon or adopt the sandblast oxidation technology to handle the formed diffuse reflector of processing of alumina based material.Wherein, more excellent scheme: the diffuse surface of the high reflectance that the alumina based material that the surface adopts the sandblast oxidation technology to process can form, its advantage is better than the coating heat-resisting quantities such as magnesium oxide of common independent spraying, and measuring accuracy is high.
Described light transmission is the lens type light transmission, and it comprises heat insulation tube, is arranged on the lens in the heat insulation tube.Having one section (linkage section that especially is connected with light collector) at least on the heat insulation tube is to be processed by the material with heat-proof quality, like teflon, pottery etc.Such benefit is that lens type light transmission light path is fixed, and is higher than Optical Fiber Transmission precision, and heat insulation tube can prevent that the heat in the temperature control box from passing on the photometer, influences measuring accuracy.
The temperature sensor that described supporting base is provided with hot connection connector, is connected with hot connection connector.The hot junction close thermal connection of hot connection connector and test specimen, this hot junction can be the appointment hot junctions of being with on the test specimen of heating radiator, or the heat conduction end points of test specimen etc.The setting of hot connection connector, convenient and various test specimen is complementary, and is convenient for changing the different test specimen of test.
Said supporting base comprises bearing support, is arranged on the support plate on the bearing support, and described hot connection connector is arranged on the support plate.
Outer with the being arranged on temperature control box again temperature measurer signal of described temperature sensor is connected.Temperature sensor is connected with temperature measurer, the working temperature of experiment with measuring sample.
Also comprise consumer unit, described photometer, temperature measurer and consumer unit all are connected with computer automatic control system.Can carry out light source data collection and analyzing and processing by computer automatic control system.
The present invention has outstanding substantive distinguishing features: 1, directly measure luminous power or the luminous flux of LED sample under certain working temperature through photometer and temperature measurer, realize robotization control, need not artificial repeatable operation, reduce measuring error, improve measuring accuracy; 2, adopt light collector (like the light integrating sphere) to carry out the collection of light source, compared with traditional fiber optic receiver, it is higher that light is accepted efficient, and be not subject to the interference of next door sample, more accurate to the life prediction of LED product.
Description of drawings
Fig. 1 a kind of structural representation of the present invention.
A kind of structural representation that light collector cooperates with test specimen among Fig. 2 the present invention.
The another kind of structural representation that light collector cooperates with test specimen among Fig. 3 the present invention.
Light transmission is a kind of sectional structure synoptic diagram of lens among Fig. 4 the present invention.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment: LED life-span real-time detection apparatus; As shown in Figure 1, comprise temperature control box 1, be located at supporting base 2 and light transmission 4 in the temperature control box 1; The photometer 5 that is connected with the measuring junction of light transmission 4; The other end of light transmission 4 is a collection terminal, and collection terminal and supporting base 2 are equipped with, and it is characterized in that also comprising the light collector 3 with light portal and light-emitting window; The collection terminal of light transmission 4 is connected the light-emitting window place on the light collector 3, and supporting base 2 cooperates with light portal on the light collector 3.
Light transmission 4 can be resistant to elevated temperatures light beam transmission apparatus such as optical fiber or lens, and photometer 5 can be spectrometer or photometer.This connection mainly is that light transmission connects.Light transmission 4 can have one or more, and is corresponding one by one with light collector 3.
Supporting base 2 comprises support 2-1 and is located at the support plate 2-2 on the support.During test, test specimen 6 is placed on the support plate 2-2, and light collector 3 is fixed on the support 2-1 with light transmission 4.Light collector 3 is mainly the light integrating sphere; The internal coating of light integrating sphere is by barium sulphate or magnesium oxide or teflon or adopt the sandblast oxidation technology to handle the formed diffuse reflector of processing of alumina based material, makes light integrating sphere inside surface have the diffuse surface of high reflectance.
Light portal on supporting base 2 and the light collector 3 (light integrating sphere) can movable cooperate.Make the distance between light integrating sphere and the test specimen 6 to adjust, the beam angle that is mainly sent according to test specimen 6 is regulated the light beam acceptance angle.As shown in Figure 2, when the beam angle of test specimen 6 hour, test specimen 6 is positioned over light integrating sphere light portal place and carries out light collection; As shown in Figure 3, when the beam angle of test specimen 6 was big, test specimen 6 was positioned over light integrating sphere inside and carries out light collection.So setting can realize the light that photometer 5 measurement whole test samples 6 are sent, and measuring accuracy is high.
As shown in Figure 2, arrive light transmission 4 in order to prevent the light direct projection that test specimen 6 is sent, nearly light-emitting window place is provided with the first baffle plate 3-1 in the inner chamber of light collector 3.
Lower Half in the inner chamber of light collector 3 also is provided with self calibration light source 3-2, and self calibration light source 3-2 the place ahead is provided with one second baffle plate 3-3.
As shown in Figure 4, light transmission 4 is the lens type light transmission, and it comprises heat insulation tube 4-2, is arranged on the lens 4-1 in the heat insulation tube.Having one section (linkage section that especially is connected with light collector) at least on the heat insulation tube 4-2 is to be processed by the material with heat-proof quality, like teflon, pottery etc.
During test, LED test specimen 6 is placed on the supporting base 2 and by consumer unit 7 power supplies, the temperature of control temperature control box 1, the light that test specimen 6 is sent is transferred to photometer 5 through light transmission 4 after being gathered by light collector 3.Temperature sensor 8 and hot connection connector 9 are housed on the LED test specimen supporting base 2 in the case; This hot connection connector 9 connects with the hot junction close thermal of test specimen 6; This hot junction can be the appointment hot junction on the test specimen 6 of band heating radiator, or the heat conduction end points of test LED device 6 etc.Temperature sensor 8 is connected with hot connection connector 9, through the hot-side temperature of temperature sensor 8 experiment with measuring samples 6, and information is sent on the temperature measurer 10.So in whole test process, the temperature of test specimen 6 and luminous power optical parameters such as (or luminous fluxes) can disposable real-time measurement, has avoided the influence of manually-operated to test findings simultaneously, measuring accuracy is higher.This pick-up unit can detect a plurality of test specimens 6 simultaneously, and detection efficiency is high, and does not disturb mutually.
When the test of LED life tests was carried out, self calibration light source 3-2 did not open, and can not influence normal led light source daylighting yet and measure.
Photometer 5, temperature measurer 10 and consumer unit 7 all can be controlled operation and data acquisition by computing machine automatically.Also can be according to testing requirement, through the working temperature of computer control temperature control box 1, and working temperature, electric current, voltage, power, relative light power or the light intensity of record test specimen 6, or even spectrum, colorimetric parameter etc.At last can be according to optical efficiency or light decay curve, by the Allan Buddhist nun now formula extrapolation get effective expected life of test specimen 6, fast and reliably the LED product is carried out life appraisal.

Claims (10)

1.LED the life-span real-time detection apparatus comprises temperature control box, is located at supporting base and light transmission in the temperature control box; The photometer that is connected with the measuring junction of light transmission; The other end of said light transmission is a collection terminal, and collection terminal and supporting base are equipped with, and it is characterized in that also comprising the light collector with light portal and light-emitting window; The collection terminal of said light transmission is connected the light-emitting window place on the light collector, and described supporting base cooperates with light portal on the light collector.
2. LED life-span real-time detection apparatus according to claim 1 is characterized in that the light portal on described supporting base and the light collector can movable cooperate.
3. LED life-span real-time detection apparatus according to claim 2 is characterized in that described light collector is an integrating sphere, and nearly light-emitting window place is provided with first baffle plate in its inner chamber.
4. LED life-span real-time detection apparatus according to claim 3 is characterized in that the Lower Half in the inner chamber of said integrating sphere also is provided with the self calibration light source, and said self calibration light source next door is provided with one second baffle plate.
5. LED life-span real-time detection apparatus according to claim 4, the internal coating that it is characterized in that said smooth integrating sphere is by barium sulphate or magnesium oxide or teflon or adopt the sandblast oxidation technology to handle the formed diffuse reflector of processing of alumina based material.
6. LED life-span real-time detection apparatus according to claim 1 is characterized in that described light transmission is the lens type light transmission, and it comprises heat insulation tube, is arranged on the lens in the heat insulation tube.
7. LED life-span real-time detection apparatus according to claim 1 is characterized in that the temperature sensor that described supporting base is provided with hot connection connector, is connected with hot connection connector.
8. LED life-span real-time detection apparatus according to claim 7 is characterized in that said supporting base comprises bearing support, is arranged on the support plate on the bearing support, and described hot connection connector is arranged on the support plate.
9. LED life-span real-time detection apparatus according to claim 7 is characterized in that outer with the being arranged on temperature control box again temperature measurer of described temperature sensor is connected.
10. LED life-span real-time detection apparatus according to claim 1 is characterized in that also comprising consumer unit, and described photometer, temperature measurer and consumer unit all are connected with computer automatic control system.
CN2011103329939A 2011-10-28 2011-10-28 Device for detecting service life of light emitting diode (LED) in real time CN102707212A (en)

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN102980747A (en) * 2012-11-27 2013-03-20 北京半导体照明科技促进中心 Method and device for accelerated detection of lumen maintenance of lighting device
CN102998632A (en) * 2012-12-13 2013-03-27 青海天普太阳能科技有限公司 Service life estimation method of light-emitting diode (LED) lamp
CN103454595A (en) * 2013-08-08 2013-12-18 晨怡(浙江)电子实业有限公司 Lamp power detecting system
CN104569778A (en) * 2014-12-20 2015-04-29 佛山市多谱光电科技有限公司 LED integrated ageing and life rapid detection device
WO2015067012A1 (en) * 2013-11-06 2015-05-14 Zhejiang Shenghui Lighting Co.,Ltd Electrical circuit and method for measuring power consumption of led lighting device
CN105258924A (en) * 2015-11-06 2016-01-20 苏州耀腾光电有限公司 Comprehensive tester for LED light
CN106772129A (en) * 2016-11-14 2017-05-31 上海电机学院 A kind of light fixture monitoring system and method for measuring lamp working time length
WO2017181507A1 (en) * 2016-04-19 2017-10-26 深圳Tcl数字技术有限公司 Method, device and system for detecting luminance degradation of light bar
CN110244212A (en) * 2019-07-15 2019-09-17 云谷(固安)科技有限公司 Organic light emitting diode device life-span test system and method, light measuring device

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102980747A (en) * 2012-11-27 2013-03-20 北京半导体照明科技促进中心 Method and device for accelerated detection of lumen maintenance of lighting device
CN102980747B (en) * 2012-11-27 2015-07-01 北京半导体照明科技促进中心 Method and device for accelerated detection of lumen maintenance of lighting device
CN102998632A (en) * 2012-12-13 2013-03-27 青海天普太阳能科技有限公司 Service life estimation method of light-emitting diode (LED) lamp
CN103454595A (en) * 2013-08-08 2013-12-18 晨怡(浙江)电子实业有限公司 Lamp power detecting system
WO2015067012A1 (en) * 2013-11-06 2015-05-14 Zhejiang Shenghui Lighting Co.,Ltd Electrical circuit and method for measuring power consumption of led lighting device
CN104569778A (en) * 2014-12-20 2015-04-29 佛山市多谱光电科技有限公司 LED integrated ageing and life rapid detection device
CN105258924A (en) * 2015-11-06 2016-01-20 苏州耀腾光电有限公司 Comprehensive tester for LED light
WO2017181507A1 (en) * 2016-04-19 2017-10-26 深圳Tcl数字技术有限公司 Method, device and system for detecting luminance degradation of light bar
CN106772129A (en) * 2016-11-14 2017-05-31 上海电机学院 A kind of light fixture monitoring system and method for measuring lamp working time length
CN110244212A (en) * 2019-07-15 2019-09-17 云谷(固安)科技有限公司 Organic light emitting diode device life-span test system and method, light measuring device

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