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This article briefly elucidates transducers. It also enlightens classification of transducers along with their applications.

N.B. : This article is compiled…



A transducer is a device that converts one form of energy to another. Energy types include (but are not limited to) electrical, mechanical, electromagnetic (including light), chemical, acoustic or thermal energy. While the term transducer commonly implies the use of a sensor/detector, any device which converts energy can be considered a transducer. Transducers are widely used in measuring instruments.


  • Electromagnetic:
    • Antenna – converts propagating electromagnetic waves to and from conducted electrical signals
    • Magnetic cartridge – converts relative physical motion to and from electrical signals
    • Tape head – converts changing magnetic fields to and from electrical signals
    • Hall effect sensor – converts a magnetic field level into an electrical signal
    • Disk read-and-write head – converts magnetic fields on a magnetic medium to and from electrical signals
  • Electrochemical:
    • pH probes
    • Electro-galvanic fuel cell
    • Hydrogen sensor
  • Electromechanical (electromechanical output devices are generically called actuators):
    • Electroactive polymers
    • Galvanometer
    • Microelectromechanical systems
    • Rotary motor, linear motor
    • Vibration powered generator
    • Potentiometer when used for measuring position
    • Load cell – converts force to mV/V electrical signal using strain gauge
    • Accelerometer
    • Strain gauge
    • String potentiometer
    • Air flow sensor
    • Tactile sensor
  • Electroacoustic:
    • Loudspeaker, earphone – converts electrical signals into sound (amplified signal → magnetic field → motion → air pressure)
    • Microphone – converts sound into an electrical signal (air pressure → motion of conductor/coil → magnetic field → electrical signal)
    • Pickup (music technology) – converts motion of metal strings into an electrical signal (magnetism → electrical signal)
    • Tactile transducer – converts electrical signal into vibration ( electrical signal → vibration)
    • Piezoelectric crystal – converts deformations of solid-state crystals (vibrations) to and from electrical signals
    • Geophone – converts a ground movement (displacement) into voltage (vibrations → motion of conductor/coil → magnetic field → signal)
    • Gramophone pickup – (air pressure → motion → magnetic field → electrical signal)
    • Hydrophone – converts changes in water pressure into an electrical signal
    • Sonar transponder (water pressure → motion of conductor/coil → magnetic field → electrical signal)
  • Electro-optical (Photoelectric):
    • Fluorescent lamp – converts electrical power into incoherent light
    • Incandescent lamp – converts electrical power into incoherent light
    • Light-Emitting Diode – converts electrical power into incoherent light
    • Laser Diode – converts electrical power into coherent light
    • Photodiode, photoresistor, phototransistor, photomultiplier tube – converts changing light levels into electrical signals
    • Photodetector or photoresistor or light dependent resistor (LDR) – converts changes in light levels into changes in electrical resistance
    • Cathode ray tube (CRT) – converts electrical signals into visual signals
  • Electrostatic:
    • Electrometer
  • Thermoelectric:
    • Resistance temperature detector (RTD)
    • Thermocouple
    • Peltier cooler
    • Thermistor (includes PTC resistor and NTC resistor)
  • Radioacoustic:
    • Geiger–Müller tube – used for measuring radioactivity
    • Receiver (radio)

17 comments on “Transducer

  1. Mr. Sachin S. Ambesange
    September 13, 2012

    i use load cell for weighing machine. This is a one type of transducer

  2. prernajain26
    September 14, 2012

    sensors and transducers ..

  3. shuman
    September 15, 2012

    hey i visited the site…it is a nice site. thanks for providing information here…i like your blog post too thanks a lot.

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  5. suman
    September 17, 2012

    hey friend, thanks for helping me and the others.

  6. angelina
    September 17, 2012


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  8. micky
    September 18, 2012

    i really appreciated every single details here. thanks for posting!

  9. sanjana
    September 19, 2012

    your sharing is much appreciated.

  10. chinu
    September 19, 2012

    hi there i like your post.

  11. Wenona Courtenay
    September 21, 2012


  12. sindy
    September 21, 2012

    very good most of your articles, many years of quality posts, i admire you in many things , love your posts.

  13. Cahve
    September 23, 2012

    i love reading through your blog, thank you for sharing with us.

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  15. Rachel
    September 24, 2012

    Hello you have a great blog over here! Thanks for sharing this interesting stuff

  16. Gerry
    September 27, 2012

    a good site ..

  17. Jerry
    September 27, 2012

    This is a nice blog over here.

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