Any device that has the ability to convert energy could be called a transducer. Some types of transducers are electrical, chemical, mechanical, and acoustic.
thermocouple, photodiode
Thermal senser
Passive transducers are the transducers which requires an external power supply to operate and the output is a measure of some variation in passive components. Example- Differential transformers, Resistance strain gauge etc..
Transducers are often used in the medical industry with an ultrasound machine. GE Healthcare as well as Fairchild both carry transducers for these types of machines.
An electronic device that will convert some form of energy produced by a physical stimulus to an electrical analogue of the stimulus can be mentioned as a transducer.Among the most frequent examples there are microphones, loudspeakers, thermostats, position and pressure sensors, antenna and thermometers. Even photocells, LEDs (Light Emitting Diodes), and even common light bulbs are transducers, although they are not generally thought as transducers.Since physical changes (heat, sound, pressure etc.) can be converted into electrical signals with transducers, they can be also used as sensors.
The mechanical transducers are the mechanical elements that are used for converting one form of energy into other form that can be measured easily. Electrical transducers may be classified as active or passive. The active transducers generate electric current or voltage directly in response to stimulation
G. A. Woolvet has written: 'Transducers in digital systems' -- subject(s): Digital control systems, Transducers 'Transducers in Digital Systems (IEEE Control Engineering Series; No. 3)'
TRANSDUCER is a device converts one form of energy into other forms sensor it is device any form into electrical form my point of view ,all the sensors are transducers ,but all the transducers are not sensors
Passive transducers are the transducers which requires an external power supply to operate and the output is a measure of some variation in passive.
transducers
position sensor (transducers)
electrical energy to mechanical form
The applications of piezo transducers are Proxmity Sensing, Nondestructive Evaluation, Fluid Flow Movement, Fluid Level Detection, and Solid/Liquid Separation. And sounders.