Open AccessTwo-dimensional temperature distribution measurement of light-emitting diodes by micro-hyperspectral imaging-based reflected light method
Author(s) -
Yang Gao,
Jian Jin,
Yi Ruan,
Yue Gao,
Lihong Zhu,
Ziquan Guo,
Yue Lin,
Zhong Chen,
Yijun Lu
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.007945
Subject(s) - hyperspectral imaging , light emitting diode , optics , materials science , diode , image resolution , infrared , optoelectronics , led lamp , remote sensing , physics , geology
We propose a non-contact measurement method for determining two-dimensional (2D) temperature distribution of light-emitting diodes (LEDs). This method is based on both micro-hyperspectral imaging technology and reflected light method, owning merits of both high efficiency and high spatial resolution. Blue and green bare LEDs are used as LED under test, while red and near-infrared LEDs provide incident light to avoid spectral overlapping so as to reduce measurement error. During data processing, the convolution linear filtering algorithm is employed to improve the measurement accuracy. This proposed method is compared with the micro-thermocouple and infrared thermal imaging, with their respective comparison results in fairly good agreements. For spatial resolution of 2D temperature distribution, this method increases at least one order of magnitude compared with the thermal imaging method.