Single-sided detection grating breaks the traditional requirement for reflection in beam-type sensors. It only needs to be installed on one side to function as a detector. It emits infrared light using invisible infrared radiation, with one grating both transmitting and receiving signals simultaneously. When the emitted light signal is reflected by an object and synchronously received, it can determine the presence or absence of an object. When any light beam detects an object, a control signal is output. No signal is output when there are no objects in the detection area. The detection distance can be adjusted via a variable potentiometer.