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