1018 実時間ホログラフィー干渉法による水中超音波波面の可視化と音圧分布測定 : 軸対称音場の場合(OS-6.GS-10 音響計測と制御)

概要

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The Visualization of underwater pulse ultrasonic wave and the measurements of its sound pressure distribution are performed with the real-time holography interferometry. The refractive index variations of the water by ultrasonic wave are recorded by sub-micro second laser pulse as a holography interference pattern in the CCD camera. For the measurement of axisymmetric sound field, the sound pressure distribution is calculated by using Abel transform from the phase distribution of interference fringes. The sound pressure distribution of the axisymmetric sound field of underwater ultrasonic wave is measured, and the wave can be visualized, as the gray scale image. As a problem, there is the concentration of the error near the center of symmetric axis. The simulation of the error is carried out.
2004-03-17