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Phase and group velocity of ultrasonics in liquids
Principle: The sound waves transmitted to a liquid by the ultrasonic generator are picked up by a piezoelectric ultrasonic pick-up and the signal from transmitter and receiver compared on an oscilloscope. The wavelength is determined and the phase velocity calculated from the relative phase position of the signals. The group velocity is determined from measurements of the sound pulse delay time.
Tasks: The signals from the ultrasonic generator and the ultrasonic pick-up are recorded on the oscilloscope.
1. To measure the relative phase position of the signal from the ultrasonic pick-up as a function of its distance from the ultrasonic generator (which is in the sine mode), and to determine the ultrasonic wavelength and the phase velocity when the frequency is known.
2.1. To determine the oscilloscope's coefficient of sweep with the aid of the ultrasonic frequency.
2.2. With the generator in the pulsed mode, to record the delay time of the sound pulses as a function of the distance between a generator and the pick-up, and to determine the group velocity.
| Artikel-Nr. | Artikelbezeichnung |
|---|---|
| P2151100 | Phase and group velocity of ultrasonics in liquids |
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