多元红外光导探测器电子学串音研究  

Study on electrical crosstalk of multi-element infrared photoconductive detectors

作　　者：李大宇[1] 段星辉[1] 魏焕东[1] 

机构地区：[1]中科院上海技术物理研究所,上海200083

出　　处：《激光与红外》2009年第9期952-955,共4页Laser & Infrared

基　　金：国家"863"计划项目(No.2007AA12Z179)资助

摘　　要：在多元红外探测器的应用中,串音是影响探测器性能的一个重要因素。其中,多元红外光导探测器的电子学串音主要由探测元间的接地电阻引起。通过对光导探测器工作电路的原理分析,得出多元红外光导探测器的电子学串音与探测元间接地电阻的阻值成正比,与偏置电阻的阻值成反比,且与原信号反相的结论,并设计了电子学串音测试原理电路进行了实验测试。测试结果验证了理论分析的正确性。通过理论推导和实验测试证明:在接地电阻一定时,通过提高偏置电阻来抑制电子学串音的方法是可行的。Crosstalk is an important factor degrading the performance of multi-element infrared detectors. In the application of multi-element infrared photoconductive detectors, electrical crosstalk is mainly caused by the grounding resistance among the elements. Base on analysis of working mechanism of photoconductive detectors, conclusions are made that the electrical crosstalk of multi-element photoconductive detectors is directly proportional to the grounding resistance and inversely proportional to the bias resistance. Meanwhile,the phase of the crosstalk signal is reversed to the origin signal. The equivalent circuit is designed for testing the electrical crosstalk, and the result of the test is consistent with the analysis. Based on the theoretical analysis and experiment, it is found that increasing the value of bias resistance is a feasible method to reduce electrical crosstalk when the grounding resistance is a certain value.

关 键 词：光导探测器 串音 前置放大 

分 类 号：TN215[电子电信—物理电子学]