An investigation of the principles and techniques of Bragg diffraction laser beam probing of an ultrasonic field.
Brown, Robert David
Power, John P.
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Probing of the near field of an ultrasonic beam in water with a thin laser beam has verified that a diffracted beam of light, whose amplitude is a function of the angle of incident light, is related to the spatial Fourier spectrum of the far-field acoustic distribution. There are indications that this method of probing may be useful in evaluating transducer mountings. As an application of the technique, reflection-transmission properties of sound on a liquid-liquid interface are examined, and the detection of evanescent waves verifies their physical existence and properties.
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