非致冷红外微测辐射热计的自热效应分析及重要参数测定

ANALYSIS OF BIAS HEATING EFFECT IN UNCOOLED INFRARED MICROBOLOMETER AND DETERMINATION OF ITS MAIN PARAMETERS

在考虑器件自热效应的情况下，对微测辐射热计的性能进行了深入地理论分析，应用了微测辐射热计的有效热导Ｇｅｆｆ概念，得出对于一定的热导的器件，存在着最佳工作偏置电流Ｉ０ｏｐｔ这一重要结论，并找到一种通过电学测量确定微测辐射热计有效热导Ｇｅｆｆ和有效时间常数τｅｆｆ的方法．试验结果与理论分析符合．

The influence of bias heating effect on uncooled microbolometer was theoretically analyzed. A practical method was presented, by which some key parameters of a device such as effective heat conductance ( G eff ) which was presented in this paper and effective time constant ( τ eff ), were determined. It was concluded that there exists the optimum operating bias current I 0 Opt for a device with given heat conductance. The experimental results are in agreement with the theoretical ones.