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

G - Physics

01

B

340/135, 324/5,

G01B 7/16 (2006.01) E21B 47/00 (2006.01) G01B 21/32 (2006.01) G01D 5/22 (2006.01) G01D 5/241 (2006.01) G01F 23/68 (2006.01)

Patent

CA 1121020

ABSTRACT OF THE DISCLOSURE A device for measuring movements or deformations has at least one pair of variable reactance movement pick-ups, each pick-up comprising transducer means whereby a modified inductive or capacitive reactance signal is generated by each pick-up in response to said 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 means, and each pick-up alters the oscillation frequency in depen- dence upon the variation of its reactance. The required measurement is derived from the difference between the two altered frequencies.

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