What are the applications of a capacitive transducer?

Answer 1

Capacitive sensors are used mainly to detect proximity, usually that of people. The operating principle is that the capacitance of the capacitor varies as material comes between the two plates of the capacitor, and you can determine the presence of something via the measurement of the capacitance.

Answer 2

A Transducer is a device used to change a mechanical property to an electrical one. Or vice versa.

Common transducers in everyday use would be a microphone and a loudspeaker. They change movement of air to an electrical signal.

Transducers are also used in weighing scales, where a bending moment caused by the weight, is changed to an electrical signal to run the display or other control devices.

Answer 3

Transducer changes energy type from one form to another. Example: Light energy to electrical, your ear probably change sound energy to chemical or electrical energy that your brain processes.