本文介绍的多用装置的光源采用同质结或单异质结GaAlAs/aaAs半导体激光器,不但具有抗干扰性能力强、传送距离远(可达几十到几百米)、保密性好、耗电少等优点,而且控制器还有报警、开关、计数等多种用途.它可以用于纺织业中的粗纱、整经、丝织等机械上的断头控制和计数;机电和化工等工业中的远距离测速、报警、计数等;水库、江河、水塔等水位的报警、控制以及机要部门的封锁报警和控制等等. This article describes the multi-device light source using homojunction or single heterojunction GaAlAs / aaAs semiconductor laser, not only has strong anti-interference ability, transmission distance (up to tens to hundreds of meters), confidentiality, power consumption Less and other advantages, but also the controller alarm, switch, counting and other purposes.It can be used in the textile industry roving, warping, silk and other mechanical breakage control and counting; mechanical and electrical and chemical industries Of the long-range speed, alarm, counting, etc .; the reservoir, rivers, towers and other water level alarm, control and confidential alarm and control departments and so on.