1Department of Electrical Engineering, Kanagawa University Faculty of Engineering, 2National Okura Hospital
Acoustic field, High power ultrasonic, Hydrophone, Laser light, Refraction
In order to measure acoustic pressure in demanding clinical applications, we describe a quantitative measurement method
used a laser beam that passes through the medium. When a light beam whose width is less than the length of a sound wave, it
is refracted by the acoustic field, because of the gradient of the refractive index generated by sound pressure in the medium. The
laser beam refracted by acoustic pressure of the transducer can be used to measure its acoustic field generated by the transducer.
To confirm the validity of the method, the measured acoustic field data obtained by a PZT disk and a focus transducer were
compared with those obtained from a calibrated PVDF hydrophone.