Optimal theoretical study of the pixel structure and spatio-temporal random noise of uncooled IRFPA
Received:June 07, 2019  Revised:April 02, 2020  download
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Author NameAffiliationE-mail
FENG Tao School of Optoelectronics, Beijing Institute of Technology, Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education of China, Beijing 100081, China tao.feng@139.com 
JIN Wei-Qi School of Optoelectronics, Beijing Institute of Technology, Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education of China, Beijing 100081, China jinwq@bit.edu.cn 
SI Jun-Jie China Airborne Missile AcademyHenan Luoyang 471009China  
ZHANG Hai-Jun North Guangwei Technology Inc.Beijing 100089China  
Abstract:The development of uncooled IRFPA pixel structure from a single-layer structure to a double-layer structure reduces noise and improves performance. The pixel structure and its main physical parameters are introduced. It is noted that the main difference between the double-layer structure and the single-layer structure lies in the difference in the effective area of the pixel and thermal conductivity of the bridge leg. The 3-D noise model is an effective method to analyze IRFPA noise, in which spatio-temporal random noise is the main noise part of uncooled IRFPA. The mechanism of spatio-temporal random noise in uncooled IRFPA is analyzed, and a spatio-temporal random noise model is established. The relationship between spatio-temporal random noise, the effective area of the pixel, the thermal conductivity of the leg is obtained. An uncooled IRFPA with a single-layer pixel structure is improved by changing it into a double-layer pixel structure, and the noise is measured. The measured data proved the effectiveness of the uncooled IRFPA spatio-temporal random noise model.
keywords:uncooled IRFPA  spatio-temporal random noise  3-D noise model  double-layer structure  microbolometer
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Copyright:《Journal of Infrared And Millimeter Waves》