• Inductive Non-Contact Position Sensors
  Inductive sensor
  An inductive sensor is an electronic proximity sensor, which detects metallic objects without touching them.The sensor consists of an induction loop. Electric current generates a magnetic field, which collapses generating a current that falls asymptotically toward zero from its initial level when...
  
  
• String Potentiometer
  String potentiometer
  A string potentiometer is a transducer used to detect and measure linear position and velocity using a flexible cable and spring-loaded spool. Other common names include "string pot", "cable-extension transducer", "draw wire sensor", and "yo-yo sensor"....
  
   (aka String Pot)
• Linear variable differential transformer
  Linear variable differential transformer
  The Linear Variable Differential Transformer is a type of electrical transformer used for measuring linear displacement. A counterpart to this device that is used for measuring rotary displacement is called a Rotary Variable Differential Transformer...
  
   (LVDT)
• Potentiometer
  Potentiometer
  A potentiometer , informally, a pot, is a three-terminal resistor with a sliding contact that forms an adjustable voltage divider. If only two terminals are used , it acts as a variable resistor or rheostat. Potentiometers are commonly used to control electrical devices such as volume controls on...
  
  
• Capacitive transducer
• Eddy-current sensor
• Hall effect sensor
  Hall effect sensor
  A Hall effect sensor is a transducer that varies its output voltage in response to a magnetic field. Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications....
  
  
• Proximity sensor
  Proximity sensor
  A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.A proximity sensor often emits an electromagnetic or a beam of electromagnetic radiation , and looks for changes in the field or return signal. The object being sensed is often referred to as...
  
   (optical)
• Grating sensor
• Rotary encoder
  Rotary encoder
  A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code. The output of incremental encoders provides information about the motion of the shaft which is typically further processed...
  
   (angular)
• Seismic displacement pick-up
• Piezo-electric transducer(Piezo-electric)
• Photodiode array

Literature

• David S. Nyce: Linear Position Sensors: Theory and Application, New Jersey, John Wiley & Sons Inc. (2003)