When an object breaks this beam of light, it’s detected as a presence. Through-beam sensors – In this type of setup, an emitter sends out a beam of light usually directly in the line-of-sight of the emitter to a receiver. A break in the light beam indicates the presence of an object. The diagram shows a typical through-beam photoelectric sensor setup with separate emitter and receiver components. These sensors are less accurate than other types, but they’re also easier to install and wire and typically cost less than through-beam sensors. The beam failing to reflect back means there is an obstruction, which registers as the presence of an object. When the light beam is able to reflect back, this registers as no object being present. Reflective sensors – In this type of sensor, a beam of light is sent out from an emitter and is bounced off of a reflector back to a detector. There are three basic configurations for photoelectric proximity sensors reflective, through-beam, and proximity. An example of a reflective sensor with both the emitter and receiver in a single housing. A common arrangement is that both the emitter and receiver are housed in the same unit, but not all photoelectric sensors are constructed this way. These sensors detect objects directly in front of them by the detecting the sensor’s own transmitted light reflected back from an object’s surface. One of the most common types of proximity sensor is the photoelectric sensor. This is why they’re often called non-contact sensors. Key to their operation is that they don’t require physical contact with the target or object being sensed. Proximity sensors are used to sense the presence of objects or materials across a broad range of industrial and manufacturing applications.
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