Sep 18, 2019
A photosensor is a device that converts an optical signal into an electrical signal. Its working principle is based on the photoelectric effect. The photoelectric effect means that when light is irradiated on certain substances, the electrons of the substance absorb the energy of the photons and a corresponding electrical effect occurs. According to the phenomenon of photoelectric effect, the photoelectric effect is divided into three categories: external photoelectric effect, internal photoelectric effect and photovoltaic effect. The photoelectric device has a phototube, a photomultiplier tube, a photoresistor, a photodiode, a phototransistor, a photocell, and the like. The performance and characteristic curves of the photovoltaic device were analyzed.