Crystal force and pressure transducers

Details Crystal force and pressure transducers Crystal force and pressure transducers

1994-01-18

1995-06-13

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310144, 310156, 73774, 73778, H01L 4108

Patent

active

054245982

ABSTRACT:
A force or fluid pressure transducer comprises a plate-like crystal. The force, to be measured, is applied by two seatings disposed on opposite edges of the crystal. The transducer can measure pressure when a diaphragm is added to provide the force.
Two portions of the crystal are maintained in continuous oscillation by feed-back circuits. These portions change their frequencies by different amounts when the force is changed. The difference between the two frequencies is a very accurate measure of the force and forms the output of the transducer.
Structures to secure the crystal have, in the past, proved difficult to manufacture. The present invention describes a securing structure for the crystal which substantially improves and facilitates securing and housing the crystal to provide high accuracy under all normal working conditions of the transducer.

REFERENCES:
patent: 4485323 (1984-11-01), Corbett
patent: 4703216 (1987-10-01), Corbett
patent: 4940915 (1990-07-01), Scott et al.

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