Photoelectric Sensors
The photoelectric sensor is a widely used versatile device in industrial and automation applications for object detection and measurement. This type of sensor operates by emitting a light beam that is either interrupted or reflected by an object to trigger detection. They are ideal for detecting objects that are small, transparent, and otherwise uniquely conditioned. They are almost always employed to do object detection and measurements in intersections. Their long sensing range and reliable detection make them candidates for use in tasks like material handing, packaging, and, very often, movable assembly lines.
There are various kinds of photoelectric sensors that operate in different ways with different sensing modes. Some are very simple but effective. For instance, a "through-beam" sensor has two basic parts: an emitter and receiver. The emitter sends out a beam of light and a receiver picks up the beam. When the beam of light is interrupted, the sensor "detects" something. "Diffuse" mode sensors are similar to "through-beam" sensors, but the light emitted "in front of" a diffuser is not as focused. This makes it much simpler to not only detect an object but to have some idea of its size.
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