Proximity detector

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Proximity detectors are devices that use mutual capacitance between itself and a nearby human body in order to detect a person's presence.

[edit] Overview

The human body is a great capacitor (body capacitance), and the proximity detector's capacitance will increase when a human is nearby. The air acts as a dielectric.

there are many types of proximity detector. common are

(1) magnetic proximity switch (2) infrared proximity switch