Electronic transducer

Details Electronic transducer Electronic transducer

H - Electricity

04

R

356/200, 349/56.

H04R 31/00 (2006.01) G01B 7/16 (2006.01)

Patent

CA 2008409

- 1 - ABSTRACT ELECTRONIC TRANSDUCER 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. 900126,!gdspe.009,unimel.spe,

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