Application of photoelectric sensors

There are various types of photoelectric sensors that use photoelectric elements as sensitive components and have a wide range of applications. According to the output properties of photoelectric sensors, they can be divided into two categories: (1) photoelectric measuring instruments made by converting the measured light into continuously changing photocurrent, which can be used to measure the intensity of light as well as physical quantities such as temperature, transmittance, displacement, and surface state of objects. For example, illuminance meters, photoelectric pyrometers, photoelectric colorimeters, and turbidity meters for measuring light intensity, photoelectric alarms for preventing fires, and automatic detection devices and instruments for checking the diameter, length, ellipticity, and surface roughness of processed parts, all of which use photoelectric elements as sensitive components. Semiconductor optoelectronic components are not only widely used in civilian industries, but also play an important role in military applications. For example, lead sulfide photoresistors can be used to make infrared night vision devices, infrared cameras, and infrared navigation systems; (2) Convert the measured current into a continuously changing photocurrent. Various photoelectric automatic devices made using the characteristic of "having" or "not having" electrical signal output when illuminated or not illuminated by photoelectric elements. Optoelectronic components are used as switch type photoelectric conversion elements. For example, photoelectric input devices for electronic computers, switch type temperature regulating devices, and digital photoelectric speedometers for speed measurement