Field-based movement sensor

Details Field-based movement sensor Field-based movement sensor

1991-04-17

1992-05-05

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified load or strain transmission device from specimen...

G01B 716

Patent

active

051097010

ABSTRACT:
A field-based movement sensor adapted for measuring strain along a certain axis in an object on which the sensor is attached. The sensor includes a substrate having a working surface and formed with a pair of fingers projecting from a first direction, and a third finger projecting from a direction oppposite the first direction, to a position between the pair of fingers. The pair of fingers and third finger extend generally perpendicular to the axis along which strain is to be measured, with the pair of fingers being moveable with respect to the third finger along the axis when the strain occurs. An electrically charged element for producing an electric field is disposed on the working surface of the third finger, and a pair of field-effect transistors (FETS) are each disposed on a working surface of a different one of the pair of fingers. As the object is subjected to strain causing the pair of fingers to move relative to the third finger, the variations in the strength of the electric field from the charged elements to the FETS is determined and this provides a measure of the variation in distance between the third finger and the pair of fingers and this, in turn, provides a measure of the strain in the object to which the substrate is attached.

REFERENCES:
patent: 4092856 (1978-06-01), Kanda
patent: 4308929 (1982-01-01), Estavoyer
patent: 4572006 (1986-02-01), Wolfendale
patent: 4649759 (1987-05-01), Lee
patent: 4767973 (1988-08-01), Wood
patent: 4825701 (1989-05-01), Holtslander
Experimental Stress Analysis by James W. Dally & William F. Riley.
Handbook of Engineering Fundamentals by Ovid W. Eshbach & Mott Souders.
Instrumentation for Engineering Measurements by James W. Dally & Kenneth G. McConnell & William F. Riley.
Mechanical Measurements by Thomas G. Beckwith, N. Lewis Buck & Roy D. Marangoni.

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