Measurements of sound intensity of ultrasonic waves by the real-time holographic interferometry with BSO single crystal

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Ultrasonic sound fields are instantaneously recorded by using real time holographic interferometry with the recording material of bismuth silicon oxide single crystal in 50ns pulsed laser radiation. Sound pressure instantaneous value distributions of the ultrasonic wave are obtained by analyzed optical path length change with trapezoidal approximation, Abel inversion or CT technique. Sound pressure amplitude and phase distribution of the ultrasonic wave are obtained by phase shift method or Hilbert transform, and it is possible to calculate the intensity distributions of two vector components(direction of propagation and the orthogonal direction) of ultrasonic waves by the application of sound intensity method. Though the measurement of ultrasonic sound field is difficult until now, the measurements(sound pressure instantaneous value, sound pressure amplitude distribution and intensity distribution of ultrasonic wave) become possible by this technique.