非制冷微测辐射热计受激光辐照的温度响应

Temperature response of uncooled microbolometer irradiated by laser

红外成像技术的不断革新使得非制冷微测辐射热计在军用侦察装备当中逐渐普及,其激光干扰技术的研究也成为热点,而探测器像元受到激光辐照的温度响应是干扰成功的关键。围绕斩波调制的激光辐照微测辐射热计的温度响应问题,立足UL01011型非晶硅探测器建立了模型,并通过有限元分析的方法研究了调制频率、占空比和激光功率三个参数各自对温度增量的影响。通过分析推导得出结论:功率稳定的连续激光经斩波调制后辐照至非制冷微测辐射热计时,稳定状态下像元温度升高量的振荡均值,与调制频率成负指数关系,与占空比成正指数关系,与激光功率成倍率关系。

The continuous innovation of infrared imaging technology has made uncooled microbolometers popular in military reconnaissance equipment.The research of laser interference technology has become a hot spot,and the temperature response of detector pixels irradiated by laser is the key to the success of interference.In this paper,the temperature response of the microbolometer irradiated by chopping laser is studied.Based on the UL01011 amorphous silicon detector,the model is established,and the effect on the temperature increment of modulation frequency,duty cycle and laser power are studied through finite element analysis.Through analysis and derivation,it is concluded that,when the uncooled micro-bolometer is irradiated by power-stable continuous laser modulated by chopping,the average value of the oscillation of the cell temperature in the steady state is in a negative exponential relationship with the modulation frequency;it is positively proportional to the duty cycle;and is proportional to the laser power.