Electronic transducer

Details Electronic transducer Electronic transducer

1990-01-22

1992-02-25

Raevis, Robert

Measuring and testing

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

Specified electrical sensor or system

G01B 716

Patent

active

050902482

ABSTRACT:
An extensometer for measuring dimensional change comprises a pair of adjacent conductors (10) helically wound to form a bifilar one layer coil so as to have substantial elastic deformation. The coil is embedded in dielectric material (13) capable of similar elastic deformation whereby the extensometer has a large dynamic range. Elongation or deformations of the extensometer cause a change in electrical capacitance between the conductors which change in capacitance is monitored to measure the elongation or deformation. The conductors may have a rectangular cross-section with rounded corners to improve linearity of the graph of capacitance versus elongation. The extensometer has a length which is at least an order of magnitude greater than the cross-sectional dimension thereof. A method of constructing the extensometer includes forming the coil on a mandrel (11) removing the mandrel and immersing the coil in a container of liquid dielectric material until the liquid cures.

REFERENCES:
patent: 2564416 (1951-08-01), Wildhack
patent: 3678378 (1972-07-01), Trott et al.
patent: 3826861 (1974-07-01), Karl et al.
patent: 4386386 (1983-05-01), Akita
patent: 4761073 (1988-08-01), Meltz et al.

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