This week, Mr Wang from the R&D Department of Dongguan Changan Fyrnetics Electronics Co., Ltd. bring the LED 626 model LED goniophotometer that the company is improving to Wewon Environmental Chambers Co., Ltd. According to the description of Mr. Wang from the R&D department, The ATS 535 model temperature forcing system produced by Wewon is very suitable for performance testing of LED goniophotometer products.
The specific method of testing: Put the LED goniophotometer electronic components responsible for communication under the conditions of -20℃ and +61.5℃, After 15 minutes of power, Observe whether the communication element can normally transmit signals under the conditions of -20℃ and +61.5℃ temperature conditions. If the electronic component can transmit the signal normally at low temperature and high temperature. Then it can be judged that the LED 626 model LED goniophotometer is capable of normal work under high and low temperature conditions.
Luminous flux is an important parameter to characterize the characteristics of light sources. It is widely used in the electric light source industry and lighting engineering. The flux of a light source can be measured by either a distributed photometer or an integrating sphere. Although the integrating sphere method is simple and easy to operate with little equipment input, due to the self-absorption effect of objects inside the integrating sphere and other problems, the integrating sphere deviates from the ideal integrating sphere, resulting in the test principle error and low measurement accuracy. Especially for LED light source, due to its small size, narrow beam and other characteristics,
Using the integrating sphere to measure the luminous flux will cause great error, even up to 30% ~ 40%. At the same time, integrating sphere method is a relative measurement method, so the system must be calibrated by using the light flux standard lamp. The distribution LED goniophotometer measures the light flux by measuring the spatial light intensity distribution curve of the light source and calculates the light flux of the light source by integrating. The LED 626 model LED goniophotometer is an absolute measurement method, which is a more accurate method.
The distribution LED goniophotometer does not require a standard lamp to measure the light flux, and the regional light flux, light efficiency, beam Angle and other parameters important to the light source and luminaires can also be calculated according to the light intensity distribution.
Although a distributed photometer is an absolutely accurate method of measuring the flux of light sources in principle. However, in the actual measurement process, due to the difference of instrument measurement precision, measurement conditions, measurement parameters and so on, it will also cause a large measurement error. Especially for the new light source LED, its size, type, color, beam Angle and other types of diverse, For leds with different colors and different beam angles, the same instrument is used to measure their luminous flux or different experimental parameters for the same LED will bring different measurement errors
|Technical Parameters of Wewon’s Temp Forcing System:||Light Intensity: 10mcD ~ 200CD|
|LED 626 Model LED Goniophotometer Photometric Accuracy: Level 1||Measurement Range Of Forward Current: 1.000mA ~ 2000.0mA|
|C Axis Rotation (automatic) Range: 0° ~ 360°||Measurement Range Of Forward Voltage: 0.001V ~ 15.000V|
|Y Axis Rotation (automatic) Range: ±10° ~ ± 90° optional||Measurement Range Of Reverse Leakage Current: 0.01 A ~ 100.00 A|
|Scan Intervals of 0.1°, 0.2°, 0.5° and 1° are optional||Measurement Range of Reverse Voltage: 0.01V ~ 10V|
|Luminous Flux Measurement Range: 0LM ~ 200LM||Preheating Time: 0 ms ~ 9999 ms Adjustable|
LED 626 model LED goniophotometer is dedicated to the LED light intensity distribution curve, light intensity, light intensity with forward current change curve, forward current with forward voltage change curve, light intensity with time change curve, and beam Angle, light flux, electrical performance parameters of the test. The machine is suitable for high test requirements such as quality inspection, laboratory, etc.
The LED can rotate automatically around the C axis and the Y axis to obtain the three-dimensional distribution of light intensity automatically. Precision LED mechanical positioning device and precision integrated design center alignment system were used. The test conditions were in accordance with CIE pub. No. 127 condition A or condition B. This is the article for practical application case for Wewon’s temp forcing system
LED 626 model LED goniophotometer equipped with a precision photometric detector with a light receiving area of 1cm2 and a V(λ) correction up to the national standard level, which fully meets the requirements of ISO/CIE international standards. According to different types of LED, optimizing its measurement parameters during testing will not only benefit measurement accuracy, but also save a lot of testing time.
Because human eyes are sensitive to electromagnetic waves of different wavelengths, We cannot measure the light energy directly by the radiant power or radiant flux of the light source. We must measure the light energy by the unit based on the human eye’s perception of light — luminous flux. The measurement principle of LED special distribution photometer is to adopt fixed detector and rotating lamp method.
Distributed photometer is a highly automated system for testing the luminosity of LED, indoor, outdoor, road and projective lamps, as well as the total luminous flux of light sources. The LED 626 model LED goniophotometer is a device to measure the light flux of the light source by absolute method. Its basic function is to measure the spatial distribution of the light intensity of the light source, so that the light flux emitted from the light source to the space can be calculated by integral calculation.