Abstract
The resonance characteristics of a plano-concave ultrasonic resonator, newly designed for precise measurements of ultrasonic velocity and absorption, were experimentally investigated over a frequency range between 100 kHz and 2MHz using five liquids with various absorption coefficients and acoustic impedances. The instrumental loss of the resonator was determined as a function of the frequency, which is subtracted from the observed resonance width in order to determine absorption in liquids. It was also found that water is the most suitable reference liquid for obtaining the instrumental loss curve of piano-concave resonator. To measure the velocity from the resonance interval, the frequency dependence of the apparent acoustic path length was observed and the results were theoretically described with a composite-resonator model consisting of an ultrasonic transducer, a sample liquid and a metal reflector. To demonstrate the usefulness of the new resonator, the velocity dispersion due to a relaxation effect was observed in methyl cyclohexane.
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