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dc.contributor.authorMorozov, Andrey K.
dc.contributor.authorWebb, Douglas C.
dc.date.accessioned2008-10-21T18:12:16Z
dc.date.available2008-10-21T18:12:16Z
dc.date.issued2007-08
dc.identifier.citationJournal of the Acoustical Society of America 122 (2007): 777-785en
dc.identifier.urihttp://hdl.handle.net/1912/2519
dc.descriptionAuthor Posting. © Acoustical Society of America, 2007. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 122 (2007): 777-785, doi:10.1121/1.2751268.en
dc.description.abstractA highly efficient frequency-controlled sound source based on a tunable high-Q underwater acoustic resonator is described. The required spectrum width was achieved by transmitting a linear frequency-modulated signal and simultaneously tuning the resonance frequency, keeping the sound source in resonance at the instantaneous frequency of the signal transmitted. Such sound sources have applications in ocean-acoustic tomography and deep-penetration seismic tomography. Mathematical analysis and numerical simulation show the Helmholtz resonator's ability for instant resonant frequency switching and quick adjustment of its resonant frequency to the instantaneous frequency signal. The concept of a quick frequency adjustment filter is considered. The discussion includes the simplest lumped resonant source as well as the complicated distributed system of a tunable organ pipe. A numerical model of the tunable organ pipe is shown to have a form similar to a transmission line segment. This provides a general form for the principal results, which can be applied to tunable resonators of a different physical nature. The numerical simulation shows that the “state-switched” concept also works in the high-Q tunable organ pipe, and the speed of frequency sweeping in a high-Q tunable organ pipe is analyzed. The simulation results were applied to a projector design for ocean-acoustic tomography.en
dc.description.sponsorshipThe work was supported by ONR.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.relation.urihttp://dx.doi.org/10.1121/1.2751268
dc.subjectAcoustic generatorsen
dc.subjectUnderwater sounden
dc.subjectAcoustic resonatorsen
dc.subjectOceanographic equipmenten
dc.subjectSeismologyen
dc.titleUnderwater tunable organ-pipe sound sourceen
dc.typeArticleen
dc.identifier.doi10.1121/1.2751268


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