使用热释电器件作为红外被动接收系统，当感受到探测区域内有人活动时，接收系统带动后继电路发出报警信号。 要求系统在给定器件和环境的条件下，作用距离尽可能远 -The use of electrical items as pyroelectric passive infrared receiving system, when the region was felt to detect when the receiving system driven alarm signal issued s