Abstract
This paper presents an acousto-optic method for tomographic mapping of acoustic fields generated by high-frequency sonar array transducers. The method uses a laser interferometer to measure the integrated refractive index change across the propagating acoustic wave generated by the transducer. An interferometer being a displacement or velocity measuring device, interprets this rate of change of optical path length as a displacement or velocity. Obtaining a series of these projections by scanning the laser beam or the transducer for a number of rotation angles of the transducer allow a two-dimensional plane of the acoustic field to be reconstructed using the techniques commonly used in X-ray Computed Tomography. Acousto-optic tomographic measurement results are presented for a 95 by 95 mm, 400 kHz 1-3 composite, 4 element sonar array transducer and are compared to conventional planar hydrophone scans obtained using a 1.5 mm probe hydrophone. The optical method allows measurement of the acoustic field without perturbing the field being measured, which can occur when using the planar hydrophone scanning method. Different tomographic geometries are considered, including parallel beam and fan-beam methods, with the advantages and disadvantages of each being discussed.
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