Abstract
Transmission and radiation of sound from submerged plates were investigated by means of a quantitative schlieren method that produced accurate visual representations of sound fields. The method was shown to be significantly faster than the usual point-by-point scans of acoustic fields with no loss of accuracy. The low-frequency resolution of the classical schlieren system was improved by nearly two orders of magnitude; sound waves with frequencies as low as 27 kHz were easily visualized. These improvements were demonstrated with a thorough investigation of sound transmission through submerged plates over a frequency range from well below to over one hundred times the classical coincidence frequency. Beam shifting caused by Lamb waves and a previously unknown cancellation with increasing frequency of modal pairs of Lamb waves were both observed.
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