Means for adjusting the sensitivity of a crystal detector

Details Means for adjusting the sensitivity of a crystal detector Means for adjusting the sensitivity of a crystal detector

1981-08-27

1983-08-02

Stephan, Steven L.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

310329, 310331, 367157, 367163, G01P 1509

Patent

active

043959083

ABSTRACT:
A twin-transducer seismic detector includes a hollow housing closed at each end by a diaphragm-type transducer. A deformable retaining member is pressed against the perimeter of each transducer. An adjustable force is applied to at least one of the deformable members to cause the member to flatten against the transducer. As the deformable member becomes flattened, it reduces the effective area of the transducer and hence alters its compliance and sensitivity. The applied force is adjusted so as to match the sensitivity of one transducer to that of the other transducer.

REFERENCES:
patent: 1340471 (1920-05-01), Williamson
patent: 1401024 (1921-12-01), Wood et al.
patent: 1478709 (1923-12-01), Gernsback
patent: 2448365 (1948-08-01), Gillespie
patent: 2726074 (1955-12-01), Ketchledge
patent: 3187300 (1965-06-01), Brate
patent: 4334296 (1982-06-01), Hall
patent: 4373119 (1983-02-01), Feder

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