Abstract
Schlieren and acoustic probe techniques are being used to study quantitatively the propagation of wide-band acoustic impulses in water. Gaussian-shaped pressure impulses (∼0.1 μsec wide) are generated using thick ceramic transducers. Acoustic probes capable of accurately representing the time profiles of the pressure impulse are being used in conjunction with fast Fourier-transform techniques to obtain information that may be correlated with the results of high-resolution schlieren measurements. These two methods complement one another and their simultaneous use yields interesting new information on acoustic diffraction, scattering, and other propagation phenomena. [Supported in part by the Office of Naval Research.]
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