How photosensitive sensors work
Photosensitive sensors are sensors that use light-sensitive elements to convert optical signals into electrical signals. The sensitive wavelengths are near the wavelength of visible light, including infrared wavelengths and ultraviolet wavelengths. The light sensor is not limited to the detection of light. It can also be used as a detector element to form other sensors. It can detect many non-electric quantities, as long as these non-electric quantities are converted into changes in the optical signal.