Device for the precise measurement of movements or deformations

Details Device for the precise measurement of movements or deformations Device for the precise measurement of movements or deformations

1979-05-11

1981-03-17

Myracle, Jerry W.

Measuring and testing

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

Earth stresses

33313, 73313, 73803, 73141A, G01L 114

Patent

active

042559758

ABSTRACT:
A device for measuring movements or deformations has at least one pair of variable reactance movement pick-ups, each pick-up comprising transducer elements whereby a modified inductive or capacitive reactance signal is generated by each pick-up in response to the movements or deformations. The variations of the reactances of the two pick-ups are arranged to be equal but opposite. An electrical oscillator is connected alternately to the two pick-ups by automatic switching elements, and each pick-up alters the oscillation frequency in dependence upon the variation of its reactance. The required measurement is derived from the difference between the two altered frequencies.

REFERENCES:
patent: 2662223 (1953-12-01), Brewer
patent: 2932972 (1960-04-01), Cosby et al.

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