抄録
The applications of laser to the measurements of ultrasoniocs are described. Ultrasonic intensities can be measured by ultrasonic-light diffraction without disturbing ultrasonic fields. This optical method is capable of very precise measurements of an ultrasonic velocity and absorption in a wide frequency range. Studies are reviewed on ultrasonic relaxation, such as molecular vibration, ion association-dissociation relaxation, and critical phenomena of binary mixtures.
