Convert optical signals into electrical signals. The working principle of photoelectric converter is mainly to convert optical signals into electrical signals. When an object is irradiated by light, it is bombarded by a series of photons with energy, so electrons in the object material absorb photon energy and produce corresponding electrical effects. This phenomenon is called photoelectric effect. Photoelectric converter is a device that uses photoelectric devices to convert optical signals into electrical signals. It mainly uses various properties of light to detect the existence of objects and the change of surface state.