Difference between active transducer and passive transducer

Active transducer Passive transducer
The active transducer is also called as self generating type transducer. The passive transducer is also called as externally powered transducer.
The active transducer does not require any auxiliary (external) power supply. The passive transducer requires auxiliary (external) power supply for transduction.
The signal conversion is simpler. The signal conversion is more complicated.
The energy required to produce output is obtained from the physical quantity. They also derived part of the power required for conversion from physical quantity under measurement.
Example of active transducer is bourdon tube. Example of passive transducer is LVDT (linear variable differential transformer).
It generates electric current or voltage directly in response to environmental stimulation. It gives a change in some passive electrical quantity, such as capacitance, resistance or inductance, as a result of stimulation.


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