Brief introduction: Light sensor is one of the most common sensors. There are many kinds of sensors, such as photoelectric tube, photomultiplier tube, photosensitive resistor, photosensitive triode, solar cell, infrared sensor, ultraviolet sensor, optical fiber photoelectric sensor, color sensor, CCD and CMOS image sensor. Its sensitive wavelength is near the visible wavelength, including infrared wavelength and ultraviolet wavelength. Optical sensors are not only limited to the detection of light, but also can be used as detection elements to form other sensors to detect many non-electric quantities, as long as these non-electric quantities are converted into changes in optical signals. Optical sensor is one of the most productive and widely used sensors. It plays a very important role in automatic control and non-electric measurement technology. The simplest light sensor is a photoresistor, which generates an electric current when the photon impacts the junction.
Principle: Light sensor is a sensor that converts light signal into electric signal by using photosensitive elements. Its sensitive wavelength is near the wavelength of visible light, including infrared wavelength and ultraviolet wavelength. Optical sensors are not only limited to the detection of light, but also can be used as detection elements to form other sensors to detect many non-electric elements, as long as these non-electric quantities are converted into changes in optical signals.
Applications: Light sensors are mainly used in the electric products of the field of light automatic control, such as solar lawn lamps, light-controlled night lights, cameras, monitors, light-controlled toys, acoustooptic switches, cameras, burglar-proof wallets, light-controlled music boxes, birthday music candles, music cups, human body induction lights, human body induction switches and so on.
The simplest electronic device in the light sensor is the photoresistor, which can sense the light and shade changes, output weak electrical signals, and control the automatic switch of the LED lamps through simple electronic circuit amplification. For remote lighting, such as street lamp, yard lamp, lawn lamp and so on, energy-saving automatic control can be realized economically and simply.
Solar street lamp itself is a kind of LED lighting which uses solar energy to generate electricity and store energy. It does not need grid power supply, nor does it need to set up expensive transmission lines. Therefore, the use of light sensors can achieve energy-saving management with extremely low cost and automatic opening and closing.