Transducer

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This article is about transducers in electronics, and lighting and heating engineering. For other forms of transduction, see Transduction. For transducers in theoretical computer science and automata theory, see Finite state transducer.

A transducer is a device that converts one form of energy to another form of energy. Energy types include/(but are not limited to) electrical, mechanical, electromagnetic (including light), chemical, acoustic, and thermal energy. Usually a transducer converts a signal in one form of energy to a signal in another[1] (for example, a loudspeaker converts an electric signal to sound), but any variable attenuation of energy may serve as input; for example, the light reflecting off the landscape, although it is not a signal, conveys information that a transducer can convert (which is what image sensors, one form of transducer, do). A sensor is a transducer whose purpose is to sense (that is, to detect) some characteristic of its environs. A sensor 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.

An actuator is a transducer that accepts energy and produces the kinetic energy of movement (action). The energy supplied to an actuator might be electrical or mechanical (pneumatic, hydraulic, etc.). An electric motor and a hydraulic cylinder are both actuators, converting electrical energy and fluid power into motion for different purposes.

Combination transducers have both functions; they both detect and create action. The most common example is an antenna, a transducer of radio waves that can transmit, receive, or both (transceiver). Another example is the typical ultrasonic transducer, which switches back and forth many times a second between acting as an actuator to produce ultrasonic waves, and acting as a sensor to detect ultrasonic waves. Rotating a DC electric motor's rotor will produce electricity, and voice-coil speakers can also act as microphones.

Applications[edit]

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[edit]

References[edit]

  • 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

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