Abstract
A holographic method for visualizing ultrasonic wavefronts in liquid media has been developed. This technique is based on the use of an off-axis double-pulsed optical holographic system. Upon reconstruction, the hologram exhibits an interference pattern related to the change in the refractive index field caused by the acoustic pressure wave. In addition to qualitative value for evaluating transducers these holograms can, in concept, be quantitatively analyzed with established procedures for studying three-dimensional refractive index fields. To date this technique has been used to study the near- and farfield patterns of transducers and various reflective targets. Additional experiments have been performed using various liquids and relative atmospheric pressures in an effort to increase the sensitivity of the method. A description of the system and the results of preliminary experiments in the 400-kHz to 5-MHz range will be presented.
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