A position sensor is any device that permits position measurement. It can either be an absolute position sensor or a relative one (displacement sensor). Position sensors can be linear, angular, or multi-axis. Some position sensors available today: Capacitive transducer Capacitive displacement sensor Eddy-current sensor Ultrasonic sensor Grating sensor Hall effect sensor Inductive non-contact position sensors Laser Doppler Vibrometer (optical) Linear variable differential transformer (LVDT) Multi-axis displacement transducer Photodiode array Piezo-electric transducer (piezo-electric) Potentiometer Proximity sensor (optical) Rotary encoder (angular) Seismic displacement pick-up String potentiometer (also known as string pot., string encoder, cable position transducer)
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