Passive Transducers is require external power
- Magnetic circuit transducer
operation = self inductance or mutual inductance of ac-excited coil is
varied by change in the magnetic circuit
- Reluctance pickup
operation = reluctance of the magnetic circuit is varied by change the
position of the iron core of a coil
- Differential Transformer
operation = the differnential voltage of two secondary winding of a
transformer is varied by positioning the magnetic core through an
external applied force
- Eddy current gage
operation = Inductance of a coil is varied by the proximity of an eddy
current plate
- Magnetostriction gage
operation = Magnetic properties are varied by pressure and stress
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