微型化绝对辐射计前置锁相放大系统的设计

摘要

长春光机所研制的绝对辐射计根据光电等效原理,用可精确电功率实时定标未知的入射光辐射功率；辐射计采用金刚石片做衬底,利用MEMS技术在金刚石片上集成了加热丝、热敏电阻,金刚石片和热沉之间产生温差,该温差可通过电桥电路测量；文章介绍一种应用于微型化的新型绝对辐射计前置锁相放大系统,该系统采用锁相放大的方法.通过交流电压激励电路可以消除传统绝对辐射测量的直流误差和由于器件温度漂移引起的误差,同时抑制交流频率外的噪声,信噪比提高了10dB,使新型电替代辐射计的绝对定标精度得到很大的提升.%The absolute radiometer can achieve the accurate calibration of unknown real - time power of light radiating with the subject of electric power. The apparatus integrates heating wire, thermistor. Two temperature sensing bridge thermistors are placed at both ends of the bolometer so that the electrical system regulates the temperature of the strip ends and the replacement heat. This paper presents a new application of micro absolute radiometer that uses lock-in amplifier method, which greatly reduces the random noise on the system, the method makes absolute calibration accuracy of the new electrical substitution radiometer (ESR) system greatly improved.