Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-02-28
1987-10-27
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
73778, H01L 4108
Patent
active
047032162
ABSTRACT:
A force and pressure transducer comprises a plate-like crystal. Two separate portions of the crystal are maintained in oscillation at different frequencies by a circuit. The crystal is firmly secured to a solid member in such a manner that deformation in the solid manner, caused by the force or fluid pressure to be measured, results in a secondary force being transmitted to the crystal. This compels the frequency of one of the two oscillating portions of the crystal to change substantially whereas the frequency of the other portion changes only minimally. The difference frequency between the two portions is a highly accurate measure of the force or fluid pressure to be measured.
In oscillating crystal transducers hitherto employing plate-like crystals wherein the force to be measured is transmitted along the surface direction, the maximum applicable force has been limited by the ability of the crystal to sustain larger forces.
The new development claimed herein permits large forces and fluid pressures to be measured.
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