Author(s)

Kei Fujisawa¹, Akira Asada²

¹Department of Ocean Technology, Policy and Environment, The University of Tokyo, Tokyo, Japan.
²Institute of Industrial Science, The University of Tokyo, Tokyo, Japan.

A novel technique for reducing reverberation artifact in acoustic shadow imaging using nonlinear ultrasound interaction, called nonlinear acoustic shadow method, has been developed and experimentally studied. In this technique, the conventional acoustic shadow method is modified by using the secondary wave generated by nonlinear interaction of two primary sound waves emitted from parametric array. Either conventional or nonlinear acoustic shadow imaging is carried out for aluminum square cylinder and the size of the shadow is compared. The result shows that the nonlinear acoustic shadow method reduces reverberation artifact inside the square cylinder and has better accuracy in the size measurement than conventional acoustic shadow method.

Acoustic Shadow Method, Reverberation Artifact, Nonlinear Ultrasound, Parametric Array, Secondary Wave

Fujisawa, K. and Asada, A. (2016) Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact. Journal of Flow Control, Measurement & Visualization, 4, 49-55. doi: 10.4236/jfcmv.2016.42005.