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Abstract
An optical method is described for studying acoustical pulses as short as two or three cycles in duration in the low-megahertz frequency range. A collimated light beam having a width of one ultrasound wavelength is observed in the optical farfield of the ultrasonic grating midway between the maxima of the central and first diffraction orders. A close approximation to both the amplitude and phase of the acoustical pressure along the light path is obtained. This method is proposed as a simple calibration procedure for recording the transmit pulse characteristics of medical ultrasound systems.
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