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.
申请公布号
AT96226(T)
申请公布日期
1993.11.15
申请号
AT19900630023T
申请日期
1990.01.23
申请人
THE UNIVERSITY OF MELBOURNE
发明人
CIMMINO, ALBERTO;KLEIN, ANTHONY G.;OPAT, GEOFFREY I.