The acousto-optic interaction in the interferometric measurement of ultrasonic transducer surface motion

Influence of acousto-optic interactions on the determination of the diffracted field by an array obtained from displacement measurements

“…The theoretical analysis developed in this first section follows those developed by Bacon et al [6] and Royer and Casula [7] in the case of a single element ultrasonic transducer. Calculations are conducted for a 2D configuration well suited for a 1D linear array.…”

“…For this calculation, displacements have only been corrected from the edge wave artifact without deconvolving data from acousto-optic interaction filter. The correction of amplitude is directly applied to the P 2 ðh; f Þ diagram using formula (6). Fig.…”

Detection and Measurement of Acoustic Fields

“…Its practical implementation has proved to be difficult, particularly in respect of isolation from environmental vibration, but an early successful design was described by Mezrich et al (1975) and a more recent arrangement, developed specifically for absolute characterisation of fields used for hydrophone calibration, has been described by Bacon (1988). The principles underlying the method are not entirely straightforward, however and, in particular, the interactions between acoustic and optical wave propagation complicates the precise measurement of details of motion of the pellicle (Bacon et al 1993).…”

Measurement of focused ultrasonic fields using a scanning laser vibrometer

“…1, in which the unsteered laser beam from a vibrometer is coincident with the acoustic axis of a transducer. A pellicle is placed at the plane x 1 , and the acoustic wavefront travels to the position x 2 at time t. Under the condition that the amplitude of the acoustic wave is much smaller compared with the acoustic wavelength, the optical path length q͑t͒ detected by the vibrometer at time t can be denoted by [20][21][22] …”