Abstract
A method is described which allows one to measure, automatically, relative velocity changes as a function of an external parameter. The method utilizes standard electronic equipment and is based on pulse-echo tracking by a sampling oscilloscope and an integrating amplifier. Its fast response time facilitates monitoring rapid velocity changes as occurring, for example, during the poling process of ferroelectric ceramics or at phase transitions, and relative velocity changes of the order of 10−5 can be detected easily.
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