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 uses invisible infrared light to emit infrared rays, with a single grating that both transmits and receives signals simultaneously. When the emitted light signal is reflected by an object and received synchronously, it determines 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 is no object in the detection area. The detection distance can be adjusted via a variable resistor.