Photoelectric sensor -to hit upon the gap and object presence
Sensors are differentiated depending on applied media. Light, one of the media, is also utilized for a sensor which is called a photoelectric sensor.
A photoelectric sensor or optical sensor detects distance, presence or absence, passing, size, color and brightness of the target objec. This sensor consists of an optical transmitter (often infrared) and a photoelectric receiver. The photoelectric sensors are classified into five categories based on working principles as follow;
- Diffuse reflective photoelectric sensor
- Retro-reflective photoelectric sensor
- Through-beam photoelectric sensor
- Distance-settable photoelectric sensor
- Limited-reflective photoelectric sensor
Optical sensors are non-erosion (do not wear or contact any part), and this property enables them for unlimited duty cycles.
There are several different types of photoelectric sensors such as light curtain, fork sensor, optical window, color, contrast, laser, luminescence, fiber optic, light-band, and door sensors.
The use of photoelectric sensors is extensive, which can be summarized as elevator cabin detection, pallet detection for agricultural product lines, parts detection for woodworking machines, accurate detection of cars in the parking, etc.
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