CN104931231A - Light engine heat radiation parameter test device and test method - Google Patents
Light engine heat radiation parameter test device and test method Download PDFInfo
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- CN104931231A CN104931231A CN201510246108.3A CN201510246108A CN104931231A CN 104931231 A CN104931231 A CN 104931231A CN 201510246108 A CN201510246108 A CN 201510246108A CN 104931231 A CN104931231 A CN 104931231A
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Abstract
The invention discloses a light engine heat radiation parameter test device and test method; the light engine heat radiation parameter test device comprises a sealed semispherical cavity, a radiator arranged in the center of the cavity, temperature sensors uniformly arranged on an inner wall of the cavity, two power meters respectively connected with a temperature heater and a to be tested light engine, and a voltage meter connected with a heat flow meter; the heat flow meter and the temperature heater are arranged on an outer side face of the radiator. A real work condition of the light engine is simulated and influences against environment temperature by convection and radiation are fully considered, so the light engine radiation parameters can be accurately measured and calculated, and influence against heat distribution by the sealed space is mastered, thus providing evidences for a designer and developer to analyze product heat radiation characteristics, and satisfying comparison test demands of different light engine heat radiation parameters under same power.
Description
Technical field
The present invention relates to a kind of proving installation, particularly a kind of for testing the photo engines such as the LED in use device of radiation parameter distribution and variation situation and method of testing thereof, belong to light fixture test equipment field.
Background technology
Because LED industry lacks unified and standard light, mechanical, electrical, hot interface, and equipment facility, working foundation and the technical merit development of each enterprise is unbalanced, cause the shortcomings such as LED illumination photo engine on market is of a great variety, different properties, interchangeability difference, bring to the development of whole industry and have a strong impact on and challenge.
In recent years, association of the alliance ZHAGA be made up of the whole world top LED manufacturer has issued a set of LED light engine standard, its cover physical size, optics, electrically, luminous intensity distribution, the main standard such as heat radiation, finally to achieve in ZHAGA alliance the compatible of product between different manufacturer and exchange.
LED light engine is in the application of reality, its reliability depends on radiating efficiency, simultaneously, LED light engine is used in the space of relative closure, the Temperature Distribution, temperature extreme difference, medial temperature etc. that are formed in space after its heat radiation all can to wherein electronic devices and components or photo engine itself cause significant impact, bulk temperature or local temperature too high time all can make product failure, cause reliability to reduce, product quality is had a strong impact on.
At present, directly also do not have for the measuring method of LED illumination product radiating efficiency.In actual production, utilize LM-80 method to be placed in high temperature, high humidity environment by product, test its product failure rate and reliability is a kind of universal method.This method is applied more in the product of other type, but the method is when measuring LED illumination product radiating efficiency, hot environment residing for it makes the radiating efficiency of heat abstractor not be the key factor determining product reliability, directly affects the accuracy of such product test.In addition, also have and adopt the instrument such as thermopair directly to measure when light fixture is lighted each point temperature on product, thus the temperature of heating radiator, the illuminating module back side, light-emitting area when obtaining product work, to judge radiating efficiency, because product heating exists unevenness, this method can not accurately draw the parameters such as product heat radiation power, and also has no way of learning for the distribution of the follow-up heat of product in space, and test result is severely limited.Also have a kind of by the method used, namely the mode analog computation of software emulation is utilized to go out the distribution of the heat radiation power of product, each point temperature and Space Thermal, consider that various factors is on the impact of radiation processes to greatest extent, simulation reconstruction lighting process, although its mentality of designing and implementation are simply, conveniently, but because simulation process and temperature variations are comparatively complicated, analog simulation data and actual effect deviation are comparatively large, poor accuracy.
How accurately to realize test process, ensure accuracy and the integrality of the test of photo engine radiation parameter, just become the subject matter that the present invention wants to solve.
Summary of the invention
In view of above-mentioned existing situation and deficiency, it is simple, effective that the present invention aims to provide a kind of test mode, and simulation process is accurate, real for testing device and the method for testing thereof of LED light engine radiation parameter.
In order to obtain photo engine radiation parameter, need to carry out Measurement accuracy to the front and back of product to parameters such as heat radiation power, spatial temperature distribution, space average temperature, and final data when changing in time above-mentioned parameter and reach thermal equilibrium carries out detailed record, this just needs design specific device, it must comprise the devices such as power meter, heat flow meter, photoradiometer, multi way temperature detector, therefore the present invention realizes by the following technical solutions:
A kind of device for test light engine radiation parameter, the hygrosensor comprising a closed hemispherical cavity and be evenly distributed on cavity inner wall, the center of hemispherical cavity is provided with a heating radiator, and the lateral surface of heating radiator is provided with heat flow meter and temperature heater successively; Also comprise two power meters and a voltmeter, two power meters are connected with photo engine to be measured with temperature heater respectively; Described voltmeter is connected with heat flow meter.
For a device for test light engine radiation parameter, also comprise multiple photoradiometer, photoradiometer is for measuring the radiation energy flux of the photo engine to be measured outside hemispherical cavity.
Described hygrosensor is uniformly distributed with 45 degree, longitude interval, 30 degree, latitude interval on semisphere inwall; Planar wall carries out radial direction with 45 degree to divide, symmetrical 4 hygrosensors on each radial dividing line.
For a method of testing for test light engine radiation parameter device, it is characterized in that, concrete steps comprise:
In step 1, measuring process, keep test environment temperature Ta between [Ta-1 DEG C, Ta+1 DEG C];
Step 2, photo engine to be measured is connected on temperature heater by screw;
Step 3, open temp well heater, power is P
0, after hygrosensor stable reading, read voltmeter reading V (P
0); Described hygrosensor stable reading refers to that in 5 minutes, temperature rising is less than 0.5%;
Step 4, repetition above-mentioned steps 3, each increase temperature heater power P
s, record and heat rear voltmeter reading V (P corresponding respectively for N time
0+ P
s), V (P
0+ 2P
s), V (P
0+ NP
s);
Step 5, linear regression calculating is carried out to the power of temperature heater and the voltage of heat flow meter, obtain the relation β of power and voltage
(W/V);
Step 6, closing temperature well heater, after device cooling, open photo engine, read the power meter be connected on photo engine to be measured, obtain photo engine power consumption P after photo engine temperature stabilization
e, meanwhile, read the number of degrees T of each hygrosensor in hemispherical cavity
i, at interval of t
stime interocclusal record temperature T at that time
si, treat T
siwhen stablizing, the medial temperature in cavity, maximum temperature difference and rendering space temperature distribution history can be calculated; Described photo engine temperature and hygrosensor stable reading refer to that in 5 minutes, temperature rising is less than 0.5%;
Step 7, measured the optical radiation power P of photo engine by integrating sphere or photoradiometer
1;
The voltmeter reading V of step 8, reading heat flow meter, that is, the backward heat radiation power P of photo engine
r=V × β, the forward direction heat radiation power P of photo engine to be measured
r=P
e-P
1-P
r, test process completes.
A kind of device for test light engine radiation parameter of the present invention and method of testing, by the real operating environments of simulated light engine, consider that the impact of light-metering engine working environment is treated in convection current and radiation, utilize hygrosensor, heat flow meter and photoradiometer achieve the Measurement accuracy and calculating for the treatment of light-metering engine radiation parameter, obtain the forward direction of photo engine in the course of work, backward heat radiation power, and the medial temperature of surrounding working environment, the temperature difference and spatial temperature profile, grasp the impact of confined space on heat distribution, for deviser and developer's analytic product heat dissipation characteristics provide foundation, for design and use better provide help with the illuminating product of photo engine, the contrast test needs of the different photo engine radiation parameters of equal-wattage can be met.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of device for test light engine radiation parameter of the present invention.
Embodiment
Center of the present invention is: be the environment for use of abundant simulated light engine, ensure rationality and the accuracy of test process, and the integrality of test parameter, the simulation process of photo engine is arranged in the environment of a relative closure by the present invention, simultaneously, take into full account the impact that optical radiation brings photo engine self and ambient temperature, the forward and backward heat radiation power of photo engine is accurately calculated and measured, thus obtain effective, reliable, a comprehensive test result.Wherein, the heat radiation power of forward, backward just represents the heat dispersion of photo engine to be measured.
Below in conjunction with accompanying drawing 1, a kind of device for test light engine radiation parameter of the present invention is further described:
A kind of device for test light engine radiation parameter of the present invention, comprises closed hemispherical cavity 8, multiple hygrosensor 7, heating radiator 1, heat flow meter 2, temperature heater 3, multiple photoradiometer, two power meters 6 and a voltmeter 5.
Multiple hygrosensor 7 is evenly distributed on the inwall of hemispherical cavity 8, and wherein, the hygrosensor 7 on semisphere inwall is uniformly distributed with 45 degree, longitude interval, 30 degree, latitude interval; Hygrosensor planar on wall carries out radial direction with 45 degree and divides, symmetrical 4 hygrosensors on each radial dividing line, thus in the enclosed environment of hemispherical cavity 8, achieve the collection of environment temperature parameter on any direction, provide accurate foundation and convenience for calculating the information such as environment medial temperature, the temperature difference, Temperature Distribution situation of change.
Heating radiator 1 is arranged on the center of hemispherical cavity 8, the lateral surface of heating radiator 1 is connected with heat flow meter 2 and temperature heater 3 in turn, photo engine 4 to be measured is connected directly between on temperature heater 3 by screw, photo engine 4 to be measured, temperature heater 3 and heat flow meter 2 are positioned at the outside of hemispherical cavity 8, and heating radiator 1 is treated the backward of light-metering engine 4 and carried out simulation heat radiation.Two power meters 6 are connected with photo engine 4 to be measured with temperature heater 3 respectively, and power meter 6 can the output power of displays temperature well heater 3 and photo engine to be measured 4 at any time.Voltmeter 5 is connected on heat flow meter 2, and voltmeter 5 shows changes of heat flux situation in real time in the mode of magnitude of voltage.Multiple photoradiometer then evenly corresponds to the photo engine to be measured 4 outside hemispherical cavity, measure the radiation energy flux outside photo engine 4 to be measured at any time, to eliminate the impact of optical radiation process on environment temperature or photo engine to be measured 4 power, improve the accuracy of simulation test process.The quantity of photoradiometer can be carried out evenly distributed according to radiation event, with can Measurement accuracy for standard, as the photoradiometers such as conventional 2,4,6.
Be described in further detail the method for testing of above-mentioned a kind of device for test light engine radiation parameter below, concrete steps comprise:
Step 1, set up stable measurement environment, to keep in measuring process test environment temperature Ta between [Ta-1 DEG C, Ta+1 DEG C].
Step 2, photo engine to be measured is connected on temperature heater by screw, realizes the backward external heat radiation of photo engine to be measured by heating radiator.
Wherein, temperature heater and heat flow meter are between heating radiator and photo engine to be measured, and temperature heater, for imitating temperature-rise period, realizes the demarcation treating light-metering engine.Heat flow meter, for showing voltage corresponding to temperature heater power at this temperature, sets up the corresponding relation of voltage and power, just can be the forward, backward heat radiation power that the later stage calculates photo engine to be measured and offers help.
Step 3, open temp well heater, power is P
0, after hygrosensor stable reading, read voltmeter reading V (P
0);
In this step, simulated the temperature environment of photo engine to be measured by temperature heater, and then determine the coefficient of relationship of photo engine power to be measured and voltage by heat flow meter.Wherein, hygrosensor stable reading refers to that in 5 minutes, temperature rising is less than 0.5%.
Step 4, repetition above-mentioned steps 3, increase temperature heater power P
s, record and heat rear voltmeter reading V (P corresponding respectively for N time
0+ P
s), V (P
0+ 2P
s), V (P
0+ NP
s), by carrying out linear regression calculating to the power of temperature heater and the voltage of heat flow meter, obtain the relation β of power and voltage
(W/V).
Step 5, closing temperature well heater, after device cooling, carry out the actual radiation parameter test of photo engine to be measured.
Step 6, unlatching photo engine, read the power meter be connected on photo engine to be measured, obtain photo engine power consumption P after photo engine temperature stabilization
e, meanwhile, read the number of degrees T of each hygrosensor in hemispherical cavity
i, at interval of t
stime interocclusal record temperature T at that time
si, treat T
siwhen stablizing, the medial temperature in cavity, maximum temperature difference and rendering space temperature distribution history can be calculated.
Wherein, photo engine temperature and hygrosensor stable reading refer to that in 5 minutes, temperature rising is less than 0.5%.Because hygrosensor is evenly distributed in hemispherical cavity, so, detect the true temperature that the temperature value obtained represents each position in hemispherical cavity, thus provide data foundation accurately for calculating medial temperature, maximum temperature difference and rendering space temperature distribution history.
Step 7, measured the optical radiation power P of photo engine by integrating sphere or photoradiometer
1.
For fully simulating lighting process, avoid the direct impact that optical radiation produces environment temperature and photo engine power, utilize multiple photoradiometer to carry out the even measurement of photo engine radiation power to be measured in this method, to eliminate in actual use radiative process to the direct impact of measurement result.
The voltmeter reading V of step 8, reading heat flow meter, the power calculated in conjunction with preceding step and voltage relationship coefficient, that is, the backward heat radiation power P of photo engine
r=V × β, and the forward direction heat radiation power P of photo engine to be measured
r=P
c-P
1-P
r.
Whole Measurement and Computation process completes.
Claims (4)
1. the device for test light engine radiation parameter, it is characterized in that, the hygrosensor comprising a closed hemispherical cavity and be evenly distributed on cavity inner wall, the center of described hemispherical cavity is provided with a heating radiator, and the lateral surface of heating radiator is provided with heat flow meter and temperature heater successively; Also comprise two power meters and a voltmeter, described two power meters are connected with photo engine to be measured with temperature heater respectively; Described voltmeter is connected with heat flow meter.
2. a kind of device for test light engine radiation parameter according to claim 1, is characterized in that, also comprise multiple photoradiometer, and described photoradiometer is for measuring the radiation energy flux of the photo engine to be measured outside hemispherical cavity.
3. a kind of device for test light engine radiation parameter according to claim 1 and 2, is characterized in that, described hygrosensor is uniformly distributed with 45 degree, longitude interval, 30 degree, latitude interval on semisphere inwall; Planar wall carries out radial direction with 45 degree to divide, symmetrical 4 hygrosensors on each radial dividing line.
4., based on the described method of testing for test light engine radiation parameter device arbitrary in the claims 1 to 3, it is characterized in that, concrete steps comprise:
In step 1, measuring process, keep test environment temperature Ta between [Ta-1 DEG C, Ta+1 DEG C];
Step 2, photo engine to be measured is connected on temperature heater by screw;
Step 3, open temp well heater, power is P
0, after hygrosensor stable reading, read voltmeter reading V (P
0); Described hygrosensor stable reading refers to that in 5 minutes, temperature rising is less than 0.5%;
Step 4, repetition above-mentioned steps 3, each increase temperature heater power P
s, record and heat rear voltmeter reading V (P corresponding respectively for N time
0+ P
s), V (P
0+ 2P
s), V (P
0+ NP
s);
Step 5, linear regression calculating is carried out to the power of temperature heater and the voltage of heat flow meter, obtain the relation β of power and voltage
(W/V);
Step 6, closing temperature well heater, after device cooling, open photo engine, read the power meter be connected on photo engine to be measured, obtain photo engine power consumption P after photo engine temperature stabilization
c, meanwhile, read the number of degrees T of each hygrosensor in hemispherical cavity
i, at interval of t
stime interocclusal record temperature T at that time
si, treat T
siwhen stablizing, the medial temperature in cavity, maximum temperature difference and rendering space temperature distribution history can be calculated; Described photo engine temperature and hygrosensor stable reading refer to that in 5 minutes, temperature rising is less than 0.5%;
Step 7, measured the optical radiation power P of photo engine by integrating sphere or photoradiometer
1;
The voltmeter reading V of step 8, reading heat flow meter, that is, the backward heat radiation power P of photo engine
r=V × β, the forward direction heat radiation power P of photo engine to be measured
f=P
e-P
1-P
r, test process completes.
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|---|---|---|---|
| CN201510246108.3A CN104931231B (en) | 2015-05-15 | 2015-05-15 | A kind of device and method of testing for being used to test light engine radiation parameter |
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|---|---|
| CN104931231A true CN104931231A (en) | 2015-09-23 |
| CN104931231B CN104931231B (en) | 2017-12-01 |
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| CN201510246108.3A Expired - Fee Related CN104931231B (en) | 2015-05-15 | 2015-05-15 | A kind of device and method of testing for being used to test light engine radiation parameter |
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| CN103822940A (en) * | 2014-03-12 | 2014-05-28 | 南京航空航天大学 | Method and device for testing thermal performance of LED radiator |
-
2015
- 2015-05-15 CN CN201510246108.3A patent/CN104931231B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003017789A (en) * | 2001-06-29 | 2003-01-17 | Fujitsu Quantum Devices Ltd | Optical-module test apparatus and measurement method of optical module characteristics |
| US7318671B1 (en) * | 2004-09-23 | 2008-01-15 | Atec, Inc. | Heat-flux based emissivity/absorptivity measurement |
| CN101699240A (en) * | 2009-10-30 | 2010-04-28 | 中山大学 | Device and method for testing radiation performance of semiconductor lighting product |
| CN102680106A (en) * | 2012-05-21 | 2012-09-19 | 南京汉德森科技股份有限公司 | Photoelectric measurement method and device for utilizing thermocouple to monitor SSL (Secure Socket Layer) lighting products |
| CN102829860A (en) * | 2012-08-17 | 2012-12-19 | 重庆大学 | Device and method for quickly measuring space chromaticity and light distribution of lamp |
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