1112 実時間ホログラフィー干渉法による水中パルス超音波波面の可視化と音圧分布測定

概要

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The visualization of underwater pulse ultrasonic wave and the measurement of its sound pressure distribution are performed by real-time holographic interferometry with BSO single crystal. Sub-micro second Nd : YVO_4 laser pulse of wavelength 523nm is used as the light source. The refractive index changes of water arise from the propagation of ultrasonic wave and optical path difference are recorded as holographic interference fringe patterns by CCD camera through the BSO single crystal. The phase shifts of the fringe pattern are obtained by Fourier transform fringe analysis method. By changing the delay time at interval of 0.5μsec, the propagation of the ultrasonic wave are recorded. Those interferograms are analyzed by this method and the gray scale images of the sound pressure distribution can be displayed like a moving picture.
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