Diaphragm design for a bender type acoustic sensor

Details Diaphragm design for a bender type acoustic sensor Diaphragm design for a bender type acoustic sensor

1981-12-08

1984-02-14

Rubinson, G. Z.

Communications, electrical: acoustic wave systems and devices

Borehole testing

367165, H01L 4108

Patent

active

044318731

ABSTRACT:
An omnidirectional acoustic sensor has an air-backed diaphragm in a unit which has a central axis and is mounted so as to be responsive to acoustic pressure waves. A piezoelectric ceramic disc is attached to each face of the diaphragm. This combination forms a sensor unit whose acoustical and capacitive sensitivities are relatively independent of varying static pressure. The ceramic discs and diaphragm are each of a preselected size such that the ratio of disc diameter to diaphragm diameter is not greater than about 0.8. The sensor assembly further includes collar-like support means from which the diaphragm is supported. The sensor unit has a radius of zero stress, with the diaphragm being connected to the support means radially outwardly of the radius of zero stress. The ceramic discs lie within that radius of zero stress. In the preferred configuration the diaphragm and support means are the same piece of material. A sensor assembly is formed by securing two sensors together, the collar-like support means being joined together by axially facing surfaces thereof.

REFERENCES:
patent: 3153156 (1964-10-01), Watlington
patent: 3202962 (1965-08-01), Elston
patent: 3255431 (1966-06-01), Howatt
patent: 3970878 (1976-07-01), Berglund
patent: 3988620 (1976-10-01), McDavid
patent: 4051455 (1977-09-01), Fowler
patent: 4347593 (1982-08-01), Trott

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