Optical sensors

What is optical sensor?


An optical sensor converts light rays into electronic signals. It measures the physical quantity of light and then translates it into a form that is readable by an instrument. An optical sensor is generally part of a larger system that integrates a source of light, a measuring device and the optical sensor.


Different types of optical sensors

  •  Retro-Reflective Sensors

Transmitter and receiver are both in the same house, through a reflector the emitted light beam is directed back to the receiver. An interruption of the light beam initiates a switching operation. Where the interruption occurs is of no importance.


  •  Diffuse Reflection Sensors

Both transmitter and receiver are in one housing. The transmitted light is reflected by the object to be detected.


  • Through-Beam Sensors

The system consists of two separate components the transmitter and the receiver are placed opposite to each other. The transmitter projects a light beam onto the receiver. An interruption of the light beam is interpreted as a switch signal by the receiver. It is irrelevant where the interruption occurs.


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