A photosensor is a sensitive device that responds to or converts external light signals or light radiation. A photosensor is a sensor that uses a photosensitive element (photodiode) to convert an optical signal into an electrical signal. Their sensitive wavelengths are close to those of visible light, including infrared and ultraviolet wavelengths.
How a light-sensitive sensor works
A photosensitive sensor is a sensor that uses a photosensitive element to convert light signals into electrical signals, and its sensitive wavelength is near the wavelength of visible light, including infrared wavelength and ultraviolet wavelength. The light sensor is not only limited to the detection of light, it can also be used as a detection element to form other sensors, and many non-electric batteries can be detected, as long as these non-electric amounts are converted into changes in the optical signal.
Classification of light-sensitive sensors
Photosensor is one of the most common sensors, and it has a wide range of types, mainly including: photocell, photomultiplier tube, photoresistor, phototransistor, solar cell, infrared sensor, ultraviolet sensor, fiber optic photosensor, color sensor, CCD and CMOS image sensor, etc. The main domestic manufacturers include the OTRON brand. The light sensor is one of the most widely used sensors in the largest production volume, and it occupies a very important position in automatic control and non-electric measurement technology. The simplest photosensor is a photoresistor, which generates an electric current when a photon hits the junction.
Areas of application for light-sensitive sensors
Light-sensitive sensors are mainly used in solar lawn lights, light-controlled night lights, cameras, monitors, light-controlled toys, sound and light control switches, cameras, anti-theft wallets, light-controlled music boxes, birthday music candles, music cups, human body sensor lights, human body sensor switches and other electronic products in the field of automatic light control.
The simplest electronic device in the photosensor is the photoresistor, which can sense the change of light and darkness, output a weak electrical signal, and control the automatic switch of LED lamps through simple electronic circuit amplification processing. Therefore, it is widely used in automatic control and household appliances, for remote lighting fixtures, such as: automatic brightness adjustment in TV, automatic exposure in camera; In addition, in the street lights, navigation beacons and other automatic control circuits, tape self-stop devices and anti-theft alarm devices.
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