Mechanical displacement-electrical signal transducer

Details Mechanical displacement-electrical signal transducer Mechanical displacement-electrical signal transducer

1979-03-13

1980-10-07

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73722, 336 20, 336 30, G01L 910

Patent

active

042261260

ABSTRACT:
To measure small displacements, for example displacement of a membrane under change of pneumatic pressure applied at opposite sides thereto, a ferromagnetic wire is stretched between a fixed support and the membrane. An exciter coil, connected to a source of alternating current of suitable strength cyclically reversely magnetizes the ferromagnetic wire. A pick-up coil is electromagnetically coupled to the wire to sense the change of magnetization thereof which will be in the form of sharp needle pulses as the magnetization of the wire changes, the pulse amplitude and pulse width being highly dependent on the strain in the wire and hence on the deflection of the membrane. The wire may be stressed under tension.

REFERENCES:
patent: 4068527 (1978-01-01), Jost et al.

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