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Near field of ultrasonic transducers (and how it pertains to acousto-optics)

The acousto-optic methods have given valuable insight to the complicated structure of the near field of ultrasonic transducers. Although the image formed is the result of the change of optical path integrated over essentially a thick grating, the results show interesting details. From the early schlieren photographs made with white light to the signals produced by pulses, surprising results are seen.