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Measurement of Concentration in Particle Suspensions Using a Converged Ultrasonic Impulse with a Broad Frequency Bandwidth

As a method to measure the concentration and acoustical properties of fine particle suspensions, we proposed a new procedure using ultrasonic attenuation, which is based on the attenuation of ultrasonic waves passing through a liquid specimen. In order to carry out the experiment, we used a focused ultrasonic impulse with a broad frequency bandwidth using a plano-concave transducer instead of a continuous wave as is utilized in the conventional method. As specimens, we used some substances composed of fine particles, the acoustic properties or sizes of which differ. As a result, it was revealed that the particle concentration and acoustical properties could be instantaneously measured easily from the attenuation information in the frequency spectrum of ultrasonic pulses. It was also clarified that the plano-concave transducer had more useful features for the measurements than polyvinylidene fluoride (PVDF) transducers.