Position sensor

A position sensor is a sensor that detects an object's position. A position sensor may indicate the absolute position of the object (its location) or its relative position (displacement) in terms of linear travel, rotational angle or three-dimensional space. Common types of position sensors include the following:

Capacitive displacement sensor
Eddy-current sensor
Hall effect sensor
Inductive sensor
Laser Doppler vibrometer (optical)
Linear variable differential transformer (LVDT)
Photodiode array
Piezo-electric transducer (piezo-electric)
Position encoders:
- Absolute encoder
- Incremental encoder
- Linear encoder
- Rotary encoder
Potentiometer
Proximity sensor (optical)
String potentiometer (also known as a string potentiometer, string encoder or cable position transducer)
Ultrasonic sensor