Abstract
A sensitive strain gauge which was developed for investigating the electromechanical properties of ferroelectric barium titanate is described. It responds faithfully only to displacements occurring fairly rapidly, i.e. in less than about 1 s. The lower limit of its response time is determined mainly by the mechanical system coupling the specimen to the gauge, and is of the order of 1 ms. The limit of sensitivity is about 10-7 cm, but the sensitivity is variable over a wide range and absolute calibration is possible. The design allows the specimen temperature to be controlled over a range -150 to +200°C.
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