Biaxial capacitance strain transducer

Details Biaxial capacitance strain transducer Biaxial capacitance strain transducer

1975-10-31

1977-06-21

Ruehl, Charles A.

Measuring and testing

Ductility or brittleness

361283, G01B 722

Patent

active

040303470

ABSTRACT:
A biaxial capacitance strain transducer in the form of a laminated structure defining two capacitance strain transducers in orthogonal orientation. Each capacitance strain transducer comprises driven capacitance plates which are excited by an oscillator and a sensing capacitance plate disposed in spaced parallel relation to the driven capacitance plates. A shutter mechanism in the form of a pair of apertured plates is provided between the driven plates and the sensing plates. The ends of the apertured plates extend out of the laminated structure and are attached to the surface wherein strain is to be measured. Strain will produce relative displacement of the apertured plates, resulting in variation in the capacitive coupling between the sensing and driven plates through the apertures. This differential capacitance, which is thus related to the strain to be measured, is detected and measured by suitable electronic instrumentation.

REFERENCES:
patent: 3729991 (1973-05-01), Hardway, Jr.
patent: 3784897 (1974-01-01), Norrie
Foldvari et al., "Capacitive Transducers", Instruments & Control Systems, vol. 37, Nov. 1964, pp. 77-85.

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