Piezoelectric sensor system

Details Piezoelectric sensor system Piezoelectric sensor system

1995-09-21

1997-04-15

Chilcot, Richard

Measuring and testing

Dynamometers

Responsive to force

73862381, G01L 100

Patent

active

056211783

ABSTRACT:
A piezoelectric sensor system according to the invention employs a piezoelectric actuator relay (20) having a piezoelectric element displaceable in response to an actuation voltage and contacts (23, 24) which open or close in accordance with the displacement of the element, wherein the actuator relay (20) is adapted to receive a force (L) to be measured against the displacement. This piezoelectric actuator relay (20) is supplied, by a driver circuit (60), with a varying voltage as the actuation voltage. The relation between the forces (L) and the activation voltages necessary for opening or closing the contacts (23, 24) has been stored in a memory (70). A processor (50) obtains a value of the force (L) based on a value of the actuation voltage at the instant of the opening or closure of the contacts (23, 24) and the relation stored in the memory (70).

REFERENCES:
patent: 4383195 (1983-05-01), Kolm et al.
patent: 4538087 (1985-08-01), Germano et al.
patent: 4625137 (1986-11-01), Tomono
patent: 4658154 (1987-04-01), Hernden et al.
patent: 5388467 (1995-02-01), Jereb et al.

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