Magnetic position sensor with magnetic field shield diaphragm

Details Magnetic position sensor with magnetic field shield diaphragm Magnetic position sensor with magnetic field shield diaphragm

1996-11-06

1998-08-25

Oen, William L.

Measuring and testing

Fluid pressure gauge

Diaphragm

73728, G01L 910, G01L 914

Patent

active

057984620

ABSTRACT:
A differential pressure transducer includes a pair of interior chambers separated by a peripherally supported, nominally planar electrically conductive diaphragm. A magnetic assembly is positioned on at least one chamber wall opposite to a central portion of the diaphragm. The magnetic assembly includes an electrical conductor and preferably a magnetic field permeable electric field shield between the electrical conductor and the chamber so that as the central portion of diaphragm is displaced from its nominal plane in response to an applied pressure differential, the inductance of the magnetic assembly changes. The transducer may be a portion of a tank circuit of an oscillator having a frequency of oscillation that varies with the pressure differential applied across the diaphragm.

REFERENCES:
patent: 4395916 (1983-08-01), Martin
patent: 4487074 (1984-12-01), Herden
patent: 4627292 (1986-12-01), Dekrone
patent: 4678994 (1987-07-01), Davies
patent: 4696192 (1987-09-01), Yamashita et al.
patent: 5150275 (1992-09-01), Lee et al.
patent: 5302894 (1994-04-01), Hrubes
patent: 5329818 (1994-07-01), Frick et al.
Liptak, Instrument Engineers Handbook, Chilton Book Company (1982) p. 203. (no month).
Khazan, Transducers and Their Elements, PTR Prentice Hall (1994) p. 136 and Table 3.4. (no month).

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