Vibration sensing element and vibration sensor

Details Vibration sensing element and vibration sensor Vibration sensing element and vibration sensor

1997-07-25

1999-03-09

Chapman, John E.

Measuring and testing

Instrument proving or calibrating

Apparatus for measuring by use of vibration or apparatus for...

73651, 200 6151, G01P 2100

Patent

active

058803513

ABSTRACT:
A vibration sensing element includes a hermetically sealed case, a fixed electrode member made of a nonmagnetic electrically conductive material and fixed to the case with its tip portion projecting into the case, a movable electrode member made of an electrically conductive magnetic metal material exhibiting elasticity and fixed to the case with its tip portion projecting into the case and making pressure contact with the fixed electrode member, and a magnetic member disposed to face the movable electrode member. A glass breakage sensor includes a casing for attachment to the glass, the vibration sensing element, and a resin molding encasing the vibration sensing element. The contact pressure between the fixed and movable electrode members can be noninvasively checked by applying a magnetic field thereto.

REFERENCES:
patent: 3422311 (1969-01-01), Stanish
patent: 4028615 (1977-06-01), Jansen et al.
patent: 4973804 (1990-11-01), Cook et al.
patent: 5155307 (1992-10-01), Breed et al.

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