Acta Optica Sinica, Volume. 35, Issue 9, 912001(2015)
Impact of Distance between Detector and LED on Measurement of Averaged LED Intensity
Commission International de Illumination (CIE) publishes‘CIE 127 technical report’(CIE 127) for light emitting diode(LED) measurement.Two different conditions (condition A and condition B) for measurement of averaged LED Intensityare proposed in CIE 127,and the LED measurement method gradually win the worldwide recognition.Most of the LED has a different averaged LED intensity in these two measurement conditions,and the difference is up to 10% in some LED measurements,so it is difficult to evaluate the averaged LED intensity accurately.Mathematical models for different kinds of luminous intensity distribution have been created according to a large amount of measurement data.Simulation results and measurement results make clear that the impact of strong directional luminous intensity distribution can be reduced to less than 0.5% when distance between detector and LED is up to 645 mm,and the equivalent full plane angle is approximately 0.5°,this work makes the value of averaged LED intensity have consistency widely.
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Liu Jian, Liu Hui, Zhao Weiqiang, Zhang Baozhou. Impact of Distance between Detector and LED on Measurement of Averaged LED Intensity[J]. Acta Optica Sinica, 2015, 35(9): 912001
Category: Instrumentation, Measurement and Metrology
Received: Mar. 2, 2015
Accepted: --
Published Online: Aug. 27, 2015
The Author Email: Jian Liu (liujian@nim.ac.cn)