Abstract
We are investigating a large-scale displacement sensor using a magnetostrictive wire with torsional and longitudinal elastic waves.Until now, many differential transformer and potentiometers have been used as displacement sensors in the industrial field. The displacement sensor described in this paper, however, measures displacement by using magnetostrictive wire. The advantage of this sensor is its non-contact, high-precision displacement measurement.We examined the generation and detection of torsional and longitudinal elastic waves. This paper describes the result of measuring how much the magnetostriction and elastic wave detection property of magnetostrictive wire are affected by heat treatment and demagnetization. It is shown that the treatment and demagnetization methods have different effects on longitudinal elastic waves and torsional waves.
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