介绍了利用红外线的发射与接收所构成的光束保护系统。红外线的发射与接收形成一“安全网”,利用其档光性能 ,可以实现安全防范功能。为提高系统抗干扰性能 ,采用调制的红外光线 ,经过信号处理 ,驱动继电器动作 ,从而实现报警和保护。本文重点阐述了光束保护系统的基本工作原理 ,并给出了主要硬件原理图 Introduced the use of infrared emission and reception constitute the beam protection system. Infrared emission and reception to form a “safety net”, the use of file light performance, security features can be achieved. To improve system anti-jamming performance, the use of modulated infrared light, after signal processing, drive relay action, in order to achieve alarm and protection. This article focuses on the basic working principle of the beam protection system and gives the main hardware schematic diagram