具有抗环境热源干扰的热释电探测器的应用研究

Study of Pyroelectric Detector of Anti-Jamming to Environmental Heat Source

热释电型探测器实际是一种对温度敏感的传感器。由于各种外界环境都可能产生一定的温度场变化,因此热释电型探测器难免受到外界干扰而引入误差。根据热释电敏感元件的探测原理,本文提出一种对正负脉冲信号和连续正负脉冲信号进行对称峰值检测的方法。若检测到的热释电信号为对称正负信号则表示被检测目标为动态热源,否则表示为静止热源。用这种方法对敏感元件的输出信号进行处理可以十分有效地消除位置固定(或移动速度很慢)的热源所产生的干扰。

Pyroelectric detector is actually a sensor sensitive to temperature. As different kinds of external environment are possible to produce big temperature changes, pyroelectric detector is inevitable to be affected and misbehave. Based on the detection principle of pyroelectric sensing elements, this paper presents a symmetrical peak detection method of continuous double plus-minus pulse signals to eliminate external interference in fixed position heat source. Symmetrical pyroelectric signals show the dynamic aim, otherwise, show the static aim. Using this method to dispose interference of output signal of sensing elements, the interference caused by fixed position heat source of constant and adagio variable temperature can be effectively eliminated in exterior.