Capacitive extensometer with curved target surface

Details Capacitive extensometer with curved target surface Capacitive extensometer with curved target surface

1987-10-01

1989-06-20

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

33788, 73780, G01R 2726, G01L 100, G01B 500

Patent

active

048412260

ABSTRACT:
A capacitive extensometer has an extensometer frame formed of a pair of arms connected together about a hinge axis at first remote ends, and having second ends which include specimen contacting members for engaging the surfaces of a specimen to be tested. A capacitive type sensing arrangement is mounted on the arms, and is used with conventional circuitry for determining arm motion. The sensing is made so that it can be compensated for nonlinearities and minimizes undesirable extraneous effects by utilizing concave and convex shaped mating surfaces on the sensing elements. The ability to mount and protect the capacitor sensor approximately, while obtaining a relatively large output signal enhances the operability of the extensometer.

REFERENCES:
patent: 2968031 (1961-01-01), Higa
patent: 3206970 (1965-09-01), Dally et al.
patent: 3400331 (1968-09-01), Harris
patent: 3729985 (1973-05-01), Sikorra
patent: 3789508 (1974-02-01), Meline
patent: 3852672 (1974-12-01), Nelson
patent: 4098000 (1978-07-01), Egger
patent: 4449413 (1984-05-01), Pugh
patent: 4532810 (1985-08-01), Prinz et al.
Holmes, Alan M. C. and Michael C. Dugan "Clip-On Extensometer", NASA TECH BRIEFS, pgs. 96 and 97, Jan./Feb. 1986.

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