CN101694401B - Method for testing optical attenuation of LED light source - Google Patents
Method for testing optical attenuation of LED light source Download PDFInfo
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- CN101694401B CN101694401B CN2009101810202A CN200910181020A CN101694401B CN 101694401 B CN101694401 B CN 101694401B CN 2009101810202 A CN2009101810202 A CN 2009101810202A CN 200910181020 A CN200910181020 A CN 200910181020A CN 101694401 B CN101694401 B CN 101694401B
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Abstract
The invention discloses a method for testing optical attenuation of an LED light source, which comprises the following steps of fixing the LED light source at one end inside a hollow cylinder with a black inner surface, mounting an illuminometer probe corresponding to the LED light source in a corresponding position of the cylinder, reading an illuminance value; immobilizing the LED light source, reading an illuminance value at fixed intervals, reading for many times and recording each illuminance value; calculating optical attenuation according to data read in many times. The invention has the advantages that the illuminometer can read directly, thereby avoiding incorrectness of test result caused by the test instrument; the illuminometer can be read when lights are available, thereby solving the problem of metering distance; and the cylinder with the black inner surface avoids influence of parasitic lights; after mounting, the LED light source is not moved until result is tested, thereby reducing influences of the position and the angle of the light source, the artificial reading difference as well as improving the accuracy of test.
Description
Technical field
The present invention relates to a kind of method of testing, be meant a kind of method for testing optical attenuation of led light source especially.
Background technology
In the process of led light source work, because heat and other factor affecting, fluorescent powder and chip can wear out gradually, the electro-optical efficiency meeting step-down of chip, bright dipping also can reduce and fluorescent powder is stimulated, and causes led light source whole lighting efficiency step-down, and this phenomenon is referred to as the light decay of led light source.
When light decay acquired a certain degree, led light source is luminous just can not to satisfy the use needs, and the life-span of led light source this moment promptly finishes.Because the led light source light decay is extremely slow, reach several ten thousand hours usually and just can reach its life-span, therefore measure the led light source method of life, all be by measuring its bright dipping reduction within a certain period of time, summing up with this and draw life value.
Method the most commonly used in the present stage industry is to pass through integrating sphere, regularly repeatedly measure again integration and draw the led light source luminous flux, calculate the variation of luminous flux in the certain hour then, estimate the life-span of led light source again, this method of testing is: at first led light source is passed through integrating sphere testing total luminous flux, light source is put in the constant current plate ageing device then and tests, to certain hour, from the constant current plate light source is pulled down again and put into integrating sphere testing total luminous flux, put back in the constant current plate wear out (led light source is in illuminating state in this process) again after test is finished always.
In this aging light decay process again and again, there is too many error, so cause the resultant error of test very big, reason mainly contains:
1, human factor: each test all needs light source is pulled down from burn-in board, in the process of dismounting, has the error of being stained with the heat-conducting glue thickness to cause heat dissipation problem; The bad problem of manually provoking led light source is arranged; Have and dismantle circuit and anchor clamps loose contact problem repeatedly; The error and the resultant error of read test that have distance, position and the angle elementary errors of manually led light source being put into integrating sphere to be caused;
2, testing tool factor: integrating sphere optical instrument particularly, no matter how advanced it is, and the total light flux of each test all can deviation, because this is to carry out integral and calculating and the numerical value that obtains by software, is not the direct numerical value of test, and instability, poor repeatability; And the light that integrating sphere measures during hypertelorism is very few, and the result is inaccurate, and the veiling glare influence is arranged too closely again.
3, testing tool: its degree of accuracy directly has influence on test result;
4, visit electrical distance: i.e. distance between testing tool and the led light source, can be lossy in the light communication process, therefore big apart from test result deviation too far away; Led light source emits beam towards all directions, so the light that the too near then testing tool of distance receives is impure, also can have influence on test result;
5, position and angle; The relative position of led light source and testing tool and angle have influence on the light that testing tool receives, and also can have influence on test result;
7, anchor clamps: the degree of clamp and clamped position have influence on the position and the angle of installation.
Above-mentioned these factors all are easy to make original light to drift about, and make the single LEDs illumination intensity of light source or the luminous flux that measure deviation significantly occur, thereby have a strong impact on the accuracy of light decay test, therefore influence the accuracy of light decay test.
And repeatedly dismounting causes testing efficiency low.The price of integrating sphere is the comparison costliness, and needs to use software, and therefore a computing machine also is essential, and the cost of overall device is just than higher like this.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method for testing optical attenuation that can mainly can improve the led light source of test accuracy.
In order to address the above problem, the present invention takes following technical scheme:
A kind of method for testing optical attenuation of led light source the steps include:
Led light source is fixed on internal layer surface is the end in the hollow cylinder of black, correspondence position is installed an illuminometer probe in cylindrical shell, and the illuminometer probe is corresponding with led light source, reads brightness value;
Led light source is motionless, reads a brightness value every the set time, repeatedly reads, and writes down each brightness value;
Calculate light decay according to above-mentioned data read in many times.
Preferably, described cylindrical shell places in the constant-temperature house.
Preferably, a fixed mount is arranged, a plurality of mounting holes are arranged on the described fixed mount, cylindrical shell places in the described mounting hole.
Preferably, heating radiator of described led light source bottom installation.
Preferably, be provided with barrier, perforate on the barrier between led light source and the illuminometer in the described cylindrical shell.
Preferably, the axis of described led light source overlaps with the axis and the illuminometer probe axis in barrier hole.
Preferably, the diameter in described barrier hole is greater than the illuminometer probe diameter.
Preferably, be provided with 3-5 layer barrier in the described cylindrical shell.
Preferably, described barrier spaced set.
Preferably, the length of described cylindrical shell is 300-350mm, and external diameter is 50-100mm.
Beneficial effect of the present invention is:
1, avoided the limitation of testing tool: do not need to pass through integral and calculating, and direct reading, the light that illuminometer measures in the led light source directive illuminometer probe scope during measurement is learnt luminous flux and area, passes through formula: illumination (lux)=luminous flux (lm)/area (m
2) obtain light flux variations, thus light decay learnt, and accuracy is very high.
2, avoided visiting the error that electrical distance produces: no matter far and near in this programme, as long as illuminometer has reading, and because led light source in the black device, does not have the veiling glare influence.
3, reduced the influence of position and angle: after one-step installation finishes, need not mobile led light source up to measuring the result, the each measurement of illuminometer all is the brightness value on the equal area in the cylindrical shell, and therefore repeatedly the position in the measuring process is consistent with angle, this influence can be reduced to minimum.
4, reduce artificial factor: can be placed into after one-step installation finishes always and measure the result and just dismantle, position and the angle of having avoided repeatedly dismounting to produce change; The reading of test is finished by illuminometer itself, does not have artificial reading difference.
5, reduced the influence of anchor clamps to test result: after one-step installation finished, up to measuring the result, therefore repeatedly the clamped position of the anchor clamps in the measuring process was consistent with angle, this influence can be reduced to minimum.
In summary, the accuracy of test has improved.
Description of drawings
Fig. 1 is the structural representation of embodiment cylindrical shell;
Fig. 2 is the structural representation of carriage;
Fig. 3 is the wiring layout of proving installation among the embodiment 1;
Fig. 4 is the schematic internal view of embodiment 2 middle cylinder bodies;
Fig. 5 is the assembling synoptic diagram of the proving installation of embodiment 3;
Fig. 6 is the cut-open view of Fig. 5;
Fig. 7 is the structural representation of fixed mount;
Fig. 8 is the structural representation of fixed mount user mode.
Among the figure:
Cylindrical shell-1 barrier-11 is hole clipping fixedly--12 barrier hole-13 carriage-2 illuminometer-3 probe-31 led light sources-4 heating radiator-5 fixed mount-6 mounting hole-61 fixed card rings-7
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Embodiment 1:
With reference to Fig. 1-Fig. 3, a kind of method for testing optical attenuation of led light source, proving installation comprises the cylindrical shell 1 of an internal layer surface for the hollow of black, a carriage 2 and an illuminometer 3 (common tool), with reference to Fig. 3 and Fig. 4, cylindrical shell 1 bottom-open, in conjunction with Fig. 6, led light source 4 is installed in carriage 2 bottoms (be routine techniques, do not do at this and give unnecessary details), and carriage 2 tops are enclosed within outside cylindrical shell 1 open end.With reference to Fig. 1, offer a fixedly hole clipping 12 with the adaptive circular hole of illuminometer circular probe 31 on cylindrical shell 1 other end, with reference to Fig. 3, illuminometer probe 31 is stuck in this fixedly in the hole clipping 12, in cylindrical shell 1.After having adorned, the light directive illuminometer of led light source emission reads brightness value; Keep led light source 4 motionless then, remove illuminometer 3 or close illuminometer 3, take back or open again illuminometer 3 every the set time and read once, repeat above-mentioned steps, repeatedly read, after each test, the date of record brightness value and test; Can find that each measurement data fluctuation has the rule rate, when writing down the brightness value number of times more for a long time, set up coordinate system with testDate/time and brightness value, each brightness value is coupled together with level and smooth curve, obtain a more straight curve, calculate 4 life-spans of led light source thereby can draw light decay with this.
Length for cylindrical shell 1, in when test so that 31 length that can receive the light (numerical value that non-zero is arranged on the illuminometer 3 when testing) that led light source 4 sends of popping one's head in get final product, the long more test result in theory of cylindrical shell is accurate more, but light is lossy in communication process, the light that illuminometer 3 receives is also just weak more, therefore.In conjunction with production requirement and installation testing requirement, the length that suggestion is adopted is 300-350mm, and external diameter is 50-100mm.
This method of testing has following advantage:
1, avoided the limitation of testing tool: do not need to pass through integral and calculating, and direct reading, the light that illuminometer measures in the led light source directive illuminometer probe scope during measurement is learnt luminous flux and area, passes through formula: illumination (lux)=luminous flux (lm)/area (m
2) obtain light flux variations, thus light decay learnt, and accuracy is very high.
2, avoided visiting the error that electrical distance produces: no matter far and near in this programme, as long as illuminometer has reading, and because led light source in the black device, does not have the veiling glare influence.
3, reduced the influence of position and angle: after one-step installation finishes, need not mobile led light source up to measuring the result, the each measurement of illuminometer all is the brightness value on the equal area in the cylindrical shell, and therefore repeatedly the position in the measuring process is consistent with angle, this influence can be reduced to minimum.
4, reduce artificial factor: can be placed into after one-step installation finishes always and measure the result and just dismantle, position and the angle of having avoided repeatedly dismounting to produce change; The reading of test is finished by illuminometer itself, does not have artificial reading difference.
5, reduced the influence of anchor clamps to test result: after one-step installation finished, up to measuring the result, therefore repeatedly the clamped position of the anchor clamps in the measuring process was consistent with angle, this influence can be reduced to minimum.
6, because cylindrical shell internal layer surface is a black, avoided the influence of veiling glare.
In summary, the accuracy of test has improved.
Simultaneously, install,, all need not carry out dismounting operation repeatedly, operate more simple and convenient saving trouble, improved testing efficiency up to measuring the result.
Embodiment 2:
The light that led light source 4 sends is to all the winds launched, in LED light decay process, its at any angle amount of light all be over time and reduce, one or more layers barrier 11 is set in the cylindrical shell 1 in the foregoing description 1, and perforate on barrier 11, as Fig. 4.This locational brightness value of periodic measurement, calculate out the light decay speed of led light source 4 according to the result who repeatedly measures, estimate life value, make illuminometer 3 all measure led light source 4 these brightness values of fixing of interior light direction among a small circle at every turn, such test result is more accurate.Preferably, the slightly larger in diameter in hole is in illuminometer 31 diameters of popping one's head in, and personal error causes led light source 4 light to be blocked too much by barrier 11 when avoiding installing.
With reference to Fig. 4, preferred, the axis in the axis of led light source 4 and barrier hole 13 and illuminometer 31 axis of popping one's head in overlap, and can guarantee that like this illuminometer can receive vertical light, are convenient to the installation of illuminometer, make test result the most accurate.
With reference to Fig. 4, preferred, barrier 11 is equidistantly arranged, and test result is more accurate.
The many more test results of the number of barrier 11 are accurate more, but production is difficult more, and in conjunction with test request and production requirement, 3-5 layer barrier adopted in suggestion.
Embodiment 3:
With reference to figure Fig. 5 and Fig. 6, for above embodiment, adorn a heating radiator 5 in led light source 4 bottoms, led light source 4 is installed on the fixed card ring 7, and two ends are fixed by screw lock, and fixed card ring 7 is fixed in carriage 2 bottoms, improves the thermal diffusivity of led light source 4.
Embodiment 4:
With reference to Fig. 7 and Fig. 8,, improve testing efficiency in order to carry out the test of a plurality of led light sources 4 simultaneously, can design a multilayer, the fixed mount 6 of a plurality of mounting holes 61 is arranged on every layer, in each mounting hole 61 cylindrical shell 1 is installed, can carry out the test of a plurality of led light sources 4 simultaneously, improve efficient.
Embodiment 5:
For the various embodiments described above, proving installation is put in the constant-temperature house (not shown), reduce the influence of external environment: test is carried out in constant-temperature house entirely, light, heat, the wind in the external world is reduced to minimum to the influence of test, and does not influence heat radiation.
In this proving installation, only need an illuminometer, low price, main cylindrical shell, carriage, fixed mount are self-control, cost is low, and constant-temperature house in the reality test also can, just just use in order more accurately to need.Therefore, real cost is hanged down a lot than the integrating sphere test.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the method for testing optical attenuation of a led light source is characterized in that, the steps include:
Led light source is fixed on internal layer surface is the end in the hollow cylinder of black, correspondence position is installed an illuminometer probe in cylindrical shell, and the illuminometer probe is corresponding with led light source, reads brightness value;
Led light source is motionless, reads a brightness value every the set time, repeatedly reads, and writes down each brightness value;
Calculate light decay according to above-mentioned data read in many times.
2. the method for testing optical attenuation of led light source according to claim 1 is characterized in that, described cylindrical shell places in the constant-temperature house.
3. the method for testing optical attenuation of led light source according to claim 1 is characterized in that, a fixed mount is arranged, and a plurality of mounting holes are arranged on the described fixed mount, and cylindrical shell places in the described mounting hole.
4. the method for testing optical attenuation of led light source according to claim 1 is characterized in that, a heating radiator is installed in described led light source bottom.
5. according to the method for testing optical attenuation of each described led light source among the claim 1-4, it is characterized in that, be provided with barrier, perforate on the barrier between led light source and the illuminometer in the described cylindrical shell.
6. the method for testing optical attenuation of led light source according to claim 5 is characterized in that, the axis of described led light source overlaps with the axis and the illuminometer probe axis in barrier hole.
7. the method for testing optical attenuation of led light source according to claim 5 is characterized in that, the diameter in described barrier hole is greater than the illuminometer probe diameter.
8. the method for testing optical attenuation of led light source according to claim 5 is characterized in that, is provided with 3-5 layer barrier in the described cylindrical shell.
9. the method for testing optical attenuation of led light source according to claim 8 is characterized in that, described barrier spaced set.
10. the method for testing optical attenuation of led light source according to claim 8 is characterized in that, the length of described cylindrical shell is 300-350mm, and external diameter is 50-100mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101810202A CN101694401B (en) | 2009-10-28 | 2009-10-28 | Method for testing optical attenuation of LED light source |
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| CN2009101810202A CN101694401B (en) | 2009-10-28 | 2009-10-28 | Method for testing optical attenuation of LED light source |
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| CN102650682A (en) * | 2011-02-24 | 2012-08-29 | 鸿富锦精密工业（深圳）有限公司 | Led probe device |
| CN103185869A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Device and method of monitoring scrapping of light emitting diode (LED) light source on line |
| CN105258924A (en) * | 2015-11-06 | 2016-01-20 | 苏州耀腾光电有限公司 | Comprehensive tester for LED light |
| CN106304491A (en) * | 2016-08-19 | 2017-01-04 | 江苏恒鹏智能电气有限公司 | Based on the energy-saving control method in the initial illumination of LED to specific illumination range |
| CN108168847A (en) * | 2017-12-25 | 2018-06-15 | 安徽腾奎智能科技有限公司 | A kind of optical fiber spotlight light decay verifying attachment and its detection method |
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| CN201314842Y (en) * | 2008-09-18 | 2009-09-23 | 陈罘杲 | Energy storage luminophor brightness detecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201314842Y (en) * | 2008-09-18 | 2009-09-23 | 陈罘杲 | Energy storage luminophor brightness detecting device |
Non-Patent Citations (2)
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| 刘熙娟.白光LED的使用寿命的定义和测试方法.《光源研究》.2001,16-22. * |
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Assignee: Jiangsu Sunlight Photoelectric Co., Ltd. Assignor: Dongguan Qinshang Photoelectric Co., Ltd. Contract record no.: 2012320000249 Denomination of invention: Method for testing optical attenuation of LED light source Granted publication date: 20110302 License type: Exclusive License Open date: 20100414 Record date: 20120316 |
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Granted publication date: 20110302 Termination date: 20171028 |