碲镉汞红外探测器高低温循环特性研究

Study on the Thermal Cycle Characteristic of HgCdTe Detector

由于卫星长寿命的要求与机械制冷机有限寿命的矛盾,制冷机必须采用间歇式工作模式,因此星载碲镉汞红外探测器在太空中工作会经受从常温(20℃)到低温(-173℃以下)的成千上万次的温度循环,这给红外探测器带来了新的可靠性问题。本文介绍了自主研发的高低温循环试验系统,液氮致冷,温度循环范围为295K到100K。利用试验系统对两种型号的红外探测器组件进行了温度循环试验可靠性研究,测试和统计了循环试验前后的电阻、信号和噪声变化,针对具体试验结果做了分析和解释,为器件的工艺研发和改进提供了参考。

The conflict of longevity of satellites service and limited life of Sterling coolers decides that coolers should work on the intermittent mode in space. As a result, detectors in satellite are commonly subjected to thousands of repeated thermal cycles from below -173℃ to room temperature （20℃）, which brings new reliability problems. This paper introduced a new thermal cycle automatic system, detector was cooled by liquid N2, temperature range was 295K to 100K. Reliability of two types of detector was studied with this equipment. Resistance, signal and noise were measured and summarized before and after experiment. The results were analyzed and explained. It would be referenced for the fabrication of detectors.