设计了一种主动对射式红外光电探测报警系统，由红外检测和信号处理两部分组成。它采用两个对射式探测距离为3 m的LH-A型光电开关作为入侵探测器，当有物体阻挡了光电开关发射的经过调制的红外光束时，光电开关产生一个开关信号。把开关信号送至AT89系列单片机作信号处理，经过判断后实现对特定方向通过的物体报警，同时也可以作流量计数器使用。该系统具有可靠性高、稳定性好、抗干扰能力强等优点。%An active correlated infrared electro-optical detection alarm system is designed. It includes infrared detection and signal processing systems. Two correlated LH-A electro-optical switches with 3 m detection distance are used as intrusion detectors. When the modulated infrared light beam from the electro-optical switches is obstructed by an object, a switch signal will be produced. The signal is sent to AT89 micro-computer unit (MCU). After processing and judging, an alarm for passing objects at special directions is given out. And the alarm system can be used as a flow counter. The system has the advantages of high reliability, good stability and anti-interference.
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