A Photoelectric Sensor consists primarily of an Emitter for emitting light and a Receiver for receiving light. When emitted light is interrupted or reflected by the sensing object, it changes the amount of light that arrives at the Receiver. The Receiver detects this change and converts it to an electrical output. There are many different styles of photoelectric sensors, but really only four basic technologies: through-beam, reflective, diffuse, and background suppression. There are three major types of photoelectric sensors: thru-beam, retroreflective, and diffused. Each sensor has its own strengths and can be used in a variety of ways. they can be used to detect objects or the orientation of an object on a production line, they can be used to count, and they can also be used to stop an automatic closing door. Photoelectric Sensors are used in the automotive, food, transportation, and material handling industries to name a few.
Advantages of Photoelectric Proximity Sensor It has longer life, long sensing range and very reliability. Very fast response time and less costly. Diffuse photoelectric sensor detects small objects including color mark and label detection. mostly retro-reflective type sensor can detect transparent objects. For those unfamiliar, a photosensor, in its simplest form, is a light sensitive component that converts photon energy into an electrical signal. The most basic of photosensors would be the photodiode, which consists of a PIN silicon configuration (p type, intrinsic, and N type). With this optical system, the distance range in which reg- ular-reflective light from the object can be detected con- sistently is the sensing distance. As such, the sensing distance can range from 10 to 35 mm depending on the upper and lower limits.
A sensor converts the physical action to be measured into an electrical equivalent and processes it so that the electrical signals can be easily sent and further processed. The sensor can output whether an object is present or not present (binary) or what measurement value has been reached (analog or digital). Photoelectric components Light-emitting devices, light detecting/ receiving components, light conduits, phototransistors, solar cells, etc.