点源红外探测器信号预处理电路的研究

Research on Infrared Point Source Detector Signal Preprocess Circuit

针对传统红外点源探测器信号预处理电路,在多目标的情况下,强目标形成脉冲信号的充放电过程会导致弱目标脉冲信号无法被采集的问题,提出了一种利用快速恢复二极管箝位电路,缩短信号预处理电路电容放电时间电路设计方法。利用快速恢复二极管导通电流大的特性,加速信号输出端的滤波电容的放电过程,使得弱目标尽可能被完整提取。通过理论计算和仿真的结果,表明该设计方法可以有效缩短滤波电容的充放电时间,最大程度地保留弱目标脉冲信号的信息特征。

In multiple target situation, signal preprocess circuit of traditional infrared point source detector may lose dim targets because of the strong targets' discharge process through capacitor. This thesis suggests a solution that may shorten discharge time by using fast-recovery diode in form of clamping circuit. Due to large conduction current, the fast-recovery diode speeds up the discharging process. The theory analysis and stimulation data prove that the solution shortens the filter capacitor's discharge time effectively and the preprocess system extracts the dim targets and reserves the target's characteristics as much as possible.