光伏型红外焦平面探测器NETD的理论计算和测试分析  

Theoretical Calculation and Test Analysis of Noise Equivalent Temperature Difference of Photovoltaic Infrared FPA Detectors

作　　者：毛京湘[1] 孔金丞[1] 孔令磊 龚晓丹[1] 黄俊博[1] 马颖婷 MAO Jingxiang;KONG Jincheng;KONG Linglei;GONG Xiaodan;HUANG Junbo;MA Yingting(Kunming Institute of Physics,Kunming 650223,China;The First Military Representative Office of the Air Force Equipment Department in Beijing,Beijing 100143,China)

机构地区：[1]昆明物理研究所,云南昆明650223 [2]空军装备部驻北京地区第一军事代表室,北京100143

出　　处：《红外技术》2024年第8期872-878,共7页Infrared Technology

摘　　要：噪声等效温差(NETD)是表征红外焦平面探测器灵敏度的重要参数,除了器件本身的因素以外,与实际应用条件及测试条件密切相关。从红外焦平面探测器NETD的测试方法和流程出发,对光伏型红外焦平面探测器NETD的理论计算公式进行了推导,分析了影响器件NETD的主要因素,对典型红外焦平面探测器在不同积分时间、不同电荷存储量、不同F数及半阱输出条件下的背景限NETD进行了理论计算及分析。在固定背景温度下,通过理论公式可从某一温差的NETD推算出不同温差的NETD,选择典型器件进行验证,从常规NETD测试结果推算出的一组NETD与相应温差下的实测结果符合较好,其中1 K温差的NETD推算结果已非常接近实际情况,可为热像仪系统应用提供参考。The noise equivalent temperature difference(NETD)is an important parameter to characterize the sensitivity of infrared FPA detectors.In addition to the detectors,they are closely related to the application and test conditions.Starting from the NETD test method and test process,the NETD theoretical calculation formula for the photovoltaic infrared FPA detector was deduced,and the main factors affecting the NETD of the detectors were analyzed.The background-limit NETD of a typical infrared FPA detector under different integration times,storable charges,F numbers,and half-well fill output conditions was calculated and theoretically analyzed.Under a fixed background temperature,NETD with different temperature differences can be theoretically calculated from a certain temperature difference NETD.By selecting a typical detector for verification,a group of NETDs calculated from the normal NETD test results were found to be in good agreement with the test results under the corresponding temperature difference.The NETD calculation result for the 1 K temperature difference is significantly close to the actual situation,which can provide a reference for the application of thermal imager systems.

关 键 词：红外焦平面探测器 噪声等效温差(NETD) 背景温度 积分时间 电荷存储量 半阱输出 

分 类 号：TN215[电子电信—物理电子学]