Calibration and measurement of internal stray radiation in thermal infrared spectrometer system
Received:January 11, 2019  Revised:July 02, 2019  download
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Author NameAffiliationE-mail
PENG Jun Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
University of Chinese Academy of Sciences, Beijing, 100049, China 
445898818@qq.com 
HE Qi Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
University of Chinese Academy of Sciences, Beijing, 100049, China 
 
ZHANG Ying Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China  
WANG Bai-Hai Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Qidong 226200, China  
SUN De-Xin Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
University of Chinese Academy of Sciences, Beijing, 100049, China
Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Qidong 226200, China 
 
LIU Yin-Nian Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
University of Chinese Academy of Sciences, Beijing, 100049, China
Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Qidong 226200, China 
 
Abstract:A method for measuring internal stray radiation in thermal infrared spectrometer system was proposed in this paper, which is based on radiometric calibration of a detector and a thermal infrared spectrometer. The output response curves of detector and the spectrometer system to blackbody radiation energy of a single spectral channel are calibrated separately. Therefore, the internal stray radiation gray value and radiation flux value of the spectrometer can be obtained and the gray value and radiation flux of the internal stray radiation at different integration times and temperatures in the system can also be calculated. The proposed method was used to measure the internal stray radiation of an existing spectrometer, and comparative experiments were carried out. Results show that the error between the experimental results and the theoretical predicted values is less than 1%. The proposed method has high maneuverability and can be used to measure the proportion of internal stray radiation in total output DN value of the system, predict the influence of refrigeration on internal stray radiation of spectrometer, and measure the inhibition effect of other internal stray radiation suppression methods.
keywords:thermal infrared  spectrometer  radiometric calibration  internal stray radiation
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