The transducers may be classified in various ways such as on the basis of electrical principle involved,methods of application,methods of energy conversion used,nature of output signal etc.
Active and Passive Transducer:
Transducers,on the basis methods of energy conversion used.may be classified into active and passive transducer.
self generating type transducers i.e., the transducers,which develop their output in the form of electrical voltage or current without any auxiliary source,are called the active transducers.Such transducers draw energy from the system under and,therefore,use of amplifier becomes essential. Tachogenerators used for measurement of angular velocity,thermocouples used for measurement of temperature,piezoelectric crystal used for measurement of force fall in this category.
Transducers,in which electrical parameters i.e.,resistance,inductance or capacitance changes with the change in input signal,are called the passive transducers.These transducer require external power source for energy conversion.In such transducer electrical parameters i.e., resistance,inductance or capacitance causes a change in voltage,current or frequency of the external power source.These transducers may draw some energy from the system under measurement. Resistive,inductive and capacitive transducer fall in this category.
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