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Based on the multi-scattering theory for the micro particles, sound speed of the TiO2 nano particle suspension with ultra-low concentration was estimated. Good agreement was found between the estimated results and the experimental ones. The sound speed of 5 MHz ultrasound was measured with high accuracy, decreasing by about 0.15 m/s as concentration of suspension was changed in the range from 0.002...
A method of controlling the focal length of concave ultrasonic transducers using a flexible surface with arrayed piezoelectric elements is proposed. The surface made of a silicon rubber has a different curvature depending on the air pressure of the inner space of the transducer housing. The acoustic fields of the transducer were measured and compared with the simulated ones. The ultrasonic field from...
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