A photosensitive sensor is a sensitive device that responds to or converts external light signals or radiation. Its core principle is to convert light signals into electrical signals through photosensitive components (such as photodiodes), with a sensitive wavelength range covering visible light, infrared, and ultraviolet. The operation of a photosensitive sensor is based on the photoelectric effect: when photons strike the photosensitive component, an electric current is generated, enabling the detection of light signals.