Pressure sensor with moisture resistance and uniform characteris

Details Pressure sensor with moisture resistance and uniform characteris Pressure sensor with moisture resistance and uniform characteris

1994-03-04

1996-02-13

Williams, Hezron E.

Measuring and testing

Fluid pressure gauge

Diaphragm

73730, 336 30, G01L 910, G01L 704

Patent

active

054904242

ABSTRACT:
The invention is a pressure sensor including a main body including a pressure inlet at and end thereof, a deformable section deformed by a pressure introduced through the pressure inlet, and a non-deformable section maintaining the shape thereof even when supplied with a pressure introduced through the pressure inlet; an amorphous magnetic alloy member having a magnetostriction constant, the amorphous magnetic alloy member being adhered on the deformable section and the non-deformable section; a first permeability detection element for detecting the permeability of a part of the amorphous magnetic alloy member corresponding to the deformable section; a second permeability detection element for detecting the permeability of another part of the amorphous magnetic alloy member corresponding to the non-deformable section; and a yoke for covering the first and the second permeability detection elements; the yoke is adhered on the main body. The amorphous magnetic alloy member and the first and the second permeability detection elements are included in a magnetic circuit, and pressure detection is performed based on the difference between the permeability detected by the first permeability detection element and the permeability detected by the second permeability detection element. The difference is caused by the application of pressure.

REFERENCES:
patent: 3603152 (1971-09-01), Alibert et al.
patent: 4365517 (1982-12-01), Ramel et al.
patent: 4412454 (1983-11-01), Yamashita et al.
patent: 4938069 (1990-07-01), Shoji et al.
Search Report for European Appl. 94103512.3 mailed Jun. 23, 1994.
"Variable New Pressure Transducer Eliminates Diaphragm", Technological Digests, 8, 1963, pp. 61-62.

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