What is it?
A transducer is an energy converter.
What does it do?
Transducers transform one form of energy into another form of energy.
How does it work?
Energy from a sensor is transformed by an actuator into another form of energy.
A sensor is a device that receives and responds to a signal. This signal must be produced by
some type of energy such as heat, light, motion, or chemical reaction. Once it detects a signal, it
converts it into an analog or digital representation.
An actuator is a device that transforms energy into motion, sound, light, electricity, or heat.
Common electroacoustic transducers:
Loudspeaker Converts an electrical signal into sound
Microphone Converts sound waves into an electrical signal
Hydrophone - Converts sound waves in water into an electrical signal.
Common electromagnetic transducers:
Magnetic cartridge Converts motion in a magnetic field into an electrical energy
Generator Converts motion in a magnetic field into electrical energy.
Electromechanical Transducers (Some are also called actuators):
Strain gauge Converts the deformation (strain) of an object into electrical resistance
Galvanometer Converts the electric current of a coil in a magnetic field into movement
Generators Converts mechanical energy (motion) into electrical energy
Motor Converts electrical energy into mechanical energy.
Cathode ray tube (CRT) Converts electrical signals into light energy for a visual output
Light bulb Converts electrical energy into visible light and heat
Laser diode Converts electrical energy into light energy
Photodiode - Converts light energy into electrical energy.
Thermocouple Converts heat energy into electrical energy