Show simple item record

dc.contributor.authorFoote, Kenneth G.
dc.contributor.authorFrancis, David T. I.
dc.contributor.authorAtkins, Philip R.
dc.date.accessioned2008-08-14T19:38:00Z
dc.date.available2008-08-14T19:38:00Z
dc.date.issued2007-03
dc.identifier.citationJournal of the Acoustical Society of America 121 (2007): 1482-1490en
dc.identifier.urihttp://hdl.handle.net/1912/2337
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 121 (2007): 1482-1490, doi:10.1121/1.2434244.en
dc.description.abstractThe problem of calibrating parametric sonar systems at low difference frequencies used in backscattering applications is addressed. A particular parametric sonar is considered: the Simrad TOPAS PS18 Parametric Sub-bottom Profiler. This generates difference-frequency signals in the band 0.5–6 kHz. A standard target is specified according to optimization conditions based on maximizing the target strength consistent with the target strength being independent of orientation and the target being physically manageable. The second condition is expressed as the target having an immersion weight less than 200 N. The result is a 280-mm-diam sphere of aluminum. Its target strength varies from −43.4 dB at 0.5 kHz to −20.2 dB at 6 kHz. Maximum excursions in target strength over the frequency band due to uncertainty in material properties of the sphere are of order ±0.1 dB. Maximum excursions in target strength due to variations in mass density and sound speed of the immersion medium are larger, but can be eliminated by attention to the hydrographic conditions. The results are also applicable to the standard-target calibration of conventional sonars operating at low-kilohertz frequencies.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.relation.urihttp://dx.doi.org/10.1121/1.2434244
dc.subjectSonaren
dc.subjectAcoustic parametric devicesen
dc.subjectAcoustic measurementen
dc.subjectUnderwater sounden
dc.subjectCalibrationen
dc.titleCalibration sphere for low-frequency parametric sonarsen
dc.typeArticleen
dc.identifier.doi10.1121/1.2434244


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record