What is proximity sensor

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The proximity sensor refers to a series of sensors used to detect the distance of an object, and their common point is that they will not touch the object during the detection process.






 There are many types of proximity sensors. The commonly used proximity sensors have the same principle. They transmit electromagnetic fields or light beams and analyze the reflected changes to determine whether objects are approaching or appearing, leaving, or disappearing.

 

The farthest detectable distance is called "rated range". Some sensors can adjust the rated range to suit different purposes. If the rated range is adjusted within a very short distance, the proximity sensor is often used as a touch switch. Proximity sensors are generally characterized by high reliability and long functional life. This is because there is no physical contact between the sensor and the sensed object, and the damage of mechanical parts is close to zero.

Different types of proximity sensors include inductive proximity sensors, capacitive proximity sensors, ultrasonic proximity sensors, photoelectric sensors, and Hall effect sensors. Different proximity sensors are suitable for detecting different types of objects. For example, capacitive sensors are suitable for detecting plastic objects, while inductive proximity sensors are used for metal targets.


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5th Edition of International Conference on Sensing Technology | 29-30 May 2023 | Brazil

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