光电开关（光电传感器）是光电接近开关的简称，它是利用被检测物对光束的遮挡或反射，由同步回路选通电路，从而检测物体有无的。物体不限于金属，所有能反射光线的物体均可被检测。光电开关将输入电流在发射器上转换为光信号射出，接收器再根据接收到的光线的强弱或有无对目标物体进行探测。安防系统中常见的光电开关烟雾报警器，工业中经常用它来记数机械臂的运动次数。
主要产品有：光电开关,接近开关,传感器，感应器,磁性开关,光纤,光纤放大器,压力开关,计数器,继电器,温控开关,PLC可编程序控制器,编码器,变频器,工业电器元件,气动元器件，气缸。产品广泛应用于工业机械的各种设备及自动化流水线、机电自动化设备。同时也在塑料、纺织、鞋业、食品、化工、以及医疗机械立体仓库中自动检测、计数、测试、保护以及限位和位置控制中起作重要作用。
SICK西克编码器代表型号：
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SRS50-HWA0-K21
VMS
RDT
OPS290-F025
OTCS40
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DMEP
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CDM
CLP
CLV
CLV
CLVS52
CLV615-F2000
HRA71-P2B01280
KUP-0610-D
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STE-0J08-GE
