Abstract
A new procedure to determine the compressional acoustic impedance of liquids within ±0.05% resolution and ±0.25% accuracy is presented. This method is based on the measurement of the bandwidth of a piezoelectric transducer, vibrating in thickness-expansion mode and having a high quality factor (e.g., air-backed X-cut quartz crystal), in direct contact with the sample. In combination with other ultrasonic techniques (pulse-echo or through-transmission), it is possible to simultaneously obtain the main ultrasonic parameters (characteristic acoustic impedance, speed of sound and attenuation coefficient), and deduce important physicochemical properties of liquids, such as density and adiabatic compressibility. Experimental results for selected liquids and solutions are shown.
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