Piezo electric relative motion sensor

Details Piezo electric relative motion sensor Piezo electric relative motion sensor

1989-12-12

1991-10-08

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

7386138, 310369, G01H 1106

Patent

active

050543229

ABSTRACT:
A motion sensor comprises a first and second structural members connected to a supporting body in a flexible arrangement and extending therefrom in an over-hanging arrangement, and a pair of Piezo electric elements respectively disposed in a gap between the first structural member and the supporting body and gap between the second structural member and the supporting body, wherein the extremities of the first and second structural members include motion coupling means which convert a relative movement between two objects under detection to a relative flexural movement between the first and second structural members, that generates two electromotive forces from the pair of Piezo electric elements, which are combined in such a way that noises are cancelled therebetween and a refined electrical signal representing the relative movement is obtained.

REFERENCES:
patent: 3858440 (1975-01-01), Budraitis
patent: 4010679 (1977-03-01), Dybel
patent: 4835436 (1989-05-01), Lew

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