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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...
Structural decay of bone is not fully assessed by current X-ray methods, and there is an unmet need in identifying women at risk of fracture who should receive a treatment. The last decade has seen the emergence of ultrasound (US) axial transmission (AT) techniques to assess cortical bone. Recent AT techniques exploit the multimode waveguide response of long bones such as the radius. Guided wave (GW)-based...
Several studies have reported that bone-conducted ultrasound (BCU) is even perceived by the profoundly sensorineural deaf; however, the mechanisms involved remain unclear. We previously reported some unique characteristics of BCU perception that suggest unique neurophisiological mechanisms. For example: (1) the pitch of BCU is 10-odd kHz and is independent of its frequency; (2) no beats occur between...
Ultrasound is a valuable tool for the detection of damage in structures and the characterization of material properties. Its detection is conventionally done by piezoelectric transducers, however fiber-optic sensors can operate over a greater range of frequencies and also yield information on the direction of wave propagation. The interaction between fiber sensors and ultrasound both demonstrates...
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