Abstract
A simple and convenient method for the accurate measurement of ultrasonic velocity is presented using a commercially available pulsed ultrasonic oscillator and receiver. The principle of operation of the present method belongs to the variable frequency method. The cw signal by the rf signal generator is provided not only for the purpose of the superposition of the same frequency rf pulse transmitted through the specimen in the form of the ultrasonic pulse, but also for the purpose of the triggering of the pulsed ultrasonic oscillator via a frequency divider. The phase matching of the cw signal of the signal generator with the rf pulse, which was generated by the ultrasonic oscillator, is detected sensitively by the video signal on the oscilloscope. The through-transmission technique makes it easy to measure the ultrasonic velocity of a highly attenuated signal, as in case of the critical phenomena.
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