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Title: Transducer  
Author: World Heritage Encyclopedia
Language: English
Subject: Hydrophone, Sensor, Microphone, Throat microphone, Ultrasonic horn
Collection: Transducers
Publisher: World Heritage Encyclopedia


A transducer is a device that converts one form of energy to another. Usually a transducer converts a signal in one form of energy to a signal in another.[1]

Transducers are often employed at the boundaries of automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities (energy, force, torque, light, motion, position, etc.).


  • Types of Transducers 1
    • Sensors 1.1
    • Actuators 1.2
    • Bidirectional 1.3
  • Applications 2
  • See also 3
  • References 4
  • External links 5

Types of Transducers


A sensor is a transducer whose purpose is to sense (i.e. detect) some characteristic of its environs; it is used to detect a parameter in one form and report it in another form of energy, often an electrical signal. For example, a pressure sensor might detect pressure (a mechanical form of energy) and convert it to electrical signal for display at a remote gauge. Transducers are widely used in measuring instruments.



Bidirectional transducers convert physical phenomena to electrical signals and also convert electrical signals into physical phenomena. Examples of inherently bidirectional transducers are antennas, which can convert conducted electrical signals to or from propagaing electromagnetic waves, and voice coils, which convert electrical signals into sound (when used in a loudspeaker) or sound into electrical signals (when used in a microphone). Likewise, DC electric motors may be used to generate electrical power if the motor shaft is turned by an external torque.


Transducers are used in electronic communications systems to convert signals of various physical forms to electronic signals, and vice versa. In this example, the first transducer could be a microphone, and the second transducer could be a speaker.

See also


  • Agarwal, Anant. Foundations of Analog and Digital Electronic Circuits.Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 2005, p. 43.
  1. ^ Agarwal, Anant. Foundations of Analog and Digital Electronic Circuits.Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 2005, p. 43

External links

  • Introduction to Closed Loop Hall Effect Current Transducers
  • Federal Standard 1037C, August 7, 1996: transducer
  • A sound transducer with a flat flexible diaphragm working with bending waves
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