Uncertainty evaluation of colour correction factor using Monte Carlo method in LED photometry measurement

Weiqiang Zhao; Hui Liu; Jinyun Yan; Ying Su; Lin Jiang

doi:10.1117/12.2538759

18 November 2019 Uncertainty evaluation of colour correction factor using Monte Carlo method in LED photometry measurement

Weiqiang Zhao, Hui Liu, Jinyun Yan, Ying Su, Lin Jiang

Author Affiliations +

Proceedings Volume 11189, Optical Metrology and Inspection for Industrial Applications VI; 111891V (2019) https://doi.org/10.1117/12.2538759
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

Nowadays, Light Emitting Diode (LED) and related products are popular in everyday lighting. Especially colour LEDs are widely used in colour application such as outdoor display, traffic signal light and cars. Precise photometric measurement results for those LED products are necessary due to needs of the international or domestic commercial trade. In the testing lab, people usually use photometer and related photometry equipment to measure LEDs. The photometer mimics the human eyes however it is not exactly the same. Thus, colour correction factor (CCF) is applied when the relative spectral response of the photometer S*(λ) is different from the photopic luminous efficiency function V(λ). Since the CCF is the most significant uncertainty component in LED total luminous flux and averaged LED luminous intensity measurement, the evaluation of uncertainty of CCF become more important in National Institute of Metrology China (NIM). Recently the Monte-Carlo method, as known as numerical simulation technique, is utilized to evaluate uncertainty by generating millions of random variable with related distribution function. The input mathematical model of the photometer S*(λ) and spectra of measurand PLED(λ) are described. The propagation of the uncertainty is also introduced. Examples of the evaluation of CCF uncertainty are shown.

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Weiqiang Zhao, Hui Liu, Jinyun Yan, Ying Su, and Lin Jiang "Uncertainty evaluation of colour correction factor using Monte Carlo method in LED photometry measurement", Proc. SPIE 11189, Optical Metrology and Inspection for Industrial Applications VI, 111891V (18 November 2019); https://doi.org/10.1117/12.2538759

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KEYWORDS

Light emitting diodes

Photometry

Monte Carlo methods

LED displays

LED lighting

Light sources and illumination

Luminous efficiency

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