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In order to detect changes in the electromagnetic field or return signal, a proximity sensor frequently emits an electromagnetic field or a beam of electromagnetic radiation (infrared, for example). The target of the proximity sensor is a common term used to describe the thing being sensed.

 

Different sensors are required for various proximity sensor targets. For instance, a photoelectric or capacitive proximity sensor could work with a plastic target, whereas an inductive proximity sensor always needs a metal target. Due to the lack of mechanical components and physical contact between the sensor and the object being detected, proximity sensors are capable of great reliability and long functional lives.