非制冷微测辐射热计探测器工作温度特性研究

RESEARCH ON OPERATING TEMPERATURE CHARACTERISTIC OF UNCOOLED MICROBOLOMETER DETECTOR

根据非制冷红外热成像技术的基本原理,通过对α-Si微测辐射热计探测器响应性能及功耗特性的分析,得到了探测器噪声等效温差NETD、探测率及功耗与工作温度之间的关系.提出了在环境温度变化范围较大的情况下改善探测器低温环境工作性能的方法——采用多个工作温度点.并对探测器采用0℃和30℃双工作温度点工作进行了实验,实验结果表明,该方法切实有效,可以显著扩展非制冷微侧辐射热计探测器的环境温度适用范围.

Characteristics about responsivity and power consumption of α-Si microbolometer detector were analyzed on the basis of uncooled thermal imaging theory. Relations between the detector＇s operating temperature and its noise equivalent temperature difference （ NETD）, detectivity and power consumption were presented respectively. Thus, a method of adopting multiple operating temperatures was proposed to improve the performance of the detector for low ambient temperature when the ambient temperature had a large dynamic range. The experiment with the detector working at two operating temperatures of 0℃ and 30℃ was conducted. And the experiment results indicate that the method is feasible, effective, and can obviously extend the ambient temperature dynamic range for the practical application of uncooled microbolometer detector.