Measuring the temperature of high-luminous exitance surfaces with infrared thermography in LED applications

Indika U. Perera; Nadarajah Narendran

doi:10.1117/12.2240650

7 September 2016 Measuring the temperature of high-luminous exitance surfaces with infrared thermography in LED applications

Indika U. Perera, Nadarajah Narendran

Author Affiliations +

Proceedings Volume 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems; 99540K (2016) https://doi.org/10.1117/12.2240650
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

Recently, light-emitting diode (LED) lighting systems have become popular due to their increased system performance. LED lighting system performance is affected by heat; therefore, it is important to know the temperature of a target surface or bulk medium in the LED system. In-situ temperature measurements of a surface or bulk medium using intrusive methods cause measurement errors. Typically, thermocouples are used in these applications to measure the temperatures of the various components in an LED system. This practice leads to significant errors, specifically when measuring surfaces with high-luminous exitance. In the experimental study presented in this paper, an infrared camera was used as an alternative to temperature probes in measuring LED surfaces with high-luminous exitance. Infrared thermography is a promising method because it does not respond to the visible radiation spectrum in the range of 0.38 to 0.78 micrometers. Usually, infrared thermography equipment is designed to operate either in the 3 to 5 micrometer or the 7 to 14 micrometer wavelength bands. To characterize the LED primary lens, the surface emissivity of the LED phosphor surface, the temperature dependence of the surface emissivity, the temperature of the target surface compared to the surrounding temperature, the field of view of the target, and the aim angle to the target surface need to be investigated, because these factors could contribute towards experimental errors. In this study, the effects of the above-stated parameters on the accuracy of the measured surface temperature were analyzed and reported.

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Indika U. Perera and Nadarajah Narendran "Measuring the temperature of high-luminous exitance surfaces with infrared thermography in LED applications", Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 99540K (7 September 2016); https://doi.org/10.1117/12.2240650

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KEYWORDS

Light emitting diodes

Thermography

Temperature metrology

Infrared radiation

Imaging systems

Infrared imaging

Silicon

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