Vibration sensor

Details Vibration sensor Vibration sensor

1999-03-26

2000-10-24

Kamm, William E.

Surgery

Diagnostic testing

Measuring anatomical characteristic or force applied to or...

A61B 511

Patent

active

061359696

ABSTRACT:
A circular layer of piezoelectric material is supported on a larger substrate disc of a thin somewhat flexible material. Flexing of the disc generates an electrical signal. The substrate disc is weighted at its periphery, and the central portion of the disc is supported on a member for transferring motion or vibration that it is desired to detect. In the preferred embodiment the center support is provided by a pair of bosses projecting into the otherwise hollow interior of a two-part casing that encloses the disc-weight assembly. The weights impart a peripheral inertia that makes the composite unit sensitive to minute vibrations.

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Hewlett Packard, Cardiotography Service Manual, page titled "Transducer 15135 A Heart Sound," Feb. 1974.
Hewlett Packard, Cardiotography Service Manual, page titled "Transducer 15135 B Heart Sound," Feb. 1974.
Murata Electronics North America, Inc., Piezoelectric Devices Catalog P-05-B, 1995.
Morgan Matroc, Inc., "TP-230 Useful Relationships for Circular Bender Bimorphs", publication date unknown.

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