| 摘要 |
PROBLEM TO BE SOLVED: To provide a length measuring device using a magnetostriction line capable of detecting a no-error even if the propagating speed through the magnetistruction line of ultrasonic vibration and the amplitude of received wave are varied due to temperature variation or the like. SOLUTION: In this length measuring device using a magnetostriction line, timing generating the ultrasonic vibration in the magnetostriction line 1 by a driving pulse applied to a driving coil 2 is synchronized with the tine when the ultrasonic vibration propagating through the magnetostriction line 1 is reflected at the open end of the other end of the magnetostriction line 1 and returned to the position of the driving coil 2, and when the ultrasonic vibration is propagated through the magnetostriction line 1 and passed through the position where a magnet piece 4 is arranged, a receiving wave signal generating in the receiving coil 3 is detected, and then when the ultrasonic vibration is reflected at the open end of the other end of the magnetostriction line 1 and passed through the position of arrangement of the magnet piece 4 again, and the position of the magnet piece 4 is measured by the time until the reflected received signal generating in the receiving coil 3 is detected.
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