In electrical engineering, capacitive sensing (sometimes capacitance sensing) is a technology, based on capacitive coupling, that can detect and measure anything that is conductive or has a dielectric different from air.
Capacitive proximity sensors are non-contact devices that can detect the presence or absence of virtually any object regardless of material. They utilize the electrical property of capacitance and the change of capacitance based on a change in the electrical field around the active face of the sensor.
Capacitive sensing technology is often used in other sensing technologies such as:
- Positioning and counting of containers, packaging and objects.
- Level monitoring of solid and liquid mediums
- spacing
- thickness
- ice detection
- shaft angle or linear position
- dimmer switches
- key switches
- x-y tablet
- accelerometers
- label detection
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