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根据红外系统信号处理电路原理和等效RC时间常数 ,分析了激光辐照红外系统使信号处理电路输出信号消失 ,然后再逐渐恢复到正常现象产生的机理。理论分析和实验研究表明 ,红外系统输出信号消失或恢复的时间不但与激光辐照功率和时间有关 ,而且主要取决于信号处理电路的等效RC时间常数。RC时间常数越大 ,输出信号的消失和恢复时间就越长。激光对红外系统输出信号的干扰时间不但与滤光片 /探测器吸收入射光能量产生的热效应有关 ,而且还主要取决于信号处理电路RC时间常数的影响。实验验证了这种结论 ,说明这种解释有一定的合理性。
According to the principle of infrared signal processing circuit and the equivalent RC time constant, the mechanism that the laser irradiated infrared system disappears the output signal of the signal processing circuit and then gradually returns to the normal phenomenon is analyzed. Theoretical analysis and experimental studies show that the time of disappearance or recovery of the output signal of the infrared system depends not only on the laser power and time, but also on the equivalent RC time constant of the signal processing circuit. The larger the RC time constant, the longer the disappearance and recovery time of the output signal. Interference time of the laser on the output signal of the infrared system is not only related to the thermal effect of the filter / detector absorbing incident light energy, but also depends on the time constant of the signal processing circuit RC. Experiments prove this conclusion, indicating that this explanation has some rationality.