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dc.contributor.authorFoote, Kenneth G.  Concept link
dc.date.accessioned2012-12-20T19:58:50Z
dc.date.available2012-12-20T19:58:50Z
dc.date.issued1983-06
dc.identifier.citationJournal of the Acoustical Society of America 73 (1983): 1932-1940en_US
dc.identifier.urihttps://hdl.handle.net/1912/5657
dc.descriptionAuthor Posting. © Acoustical Society of America, 1983. 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 73 (1983): 1932-1940, doi:10.1121/1.389583.en_US
dc.description.abstractAn experiment to verify the basic linearity of fisheries acoustics is described. Herring (Clupea harengus L.) was the subject fish. Acoustic measurements consisted of the echo energy from aggregations of encaged but otherwise free‐swimming fish, and the target strength functions of similar, anesthetized specimens. Periodic photographic observation of the encaged fish allowed characterization of their behavior through associated spatial and orientation distributions. The fish biology and hydrography were also measured. Computations of the echo energy from encaged aggregations, derived by exercising the linear theory with the target strength functions of anesthetized fish and gross behavioral characteristics of encaged fish, agreed well with observation. This success was obtained for each of four independent echo sounders operating at frequencies from 38 to 120 kHz and at power levels from 35 W to nearly 1 kW. In addition to demonstrating the basic linearity of fisheries acoustics, the experiment verified both conventional acoustic measurements on anesthetized fish, at least for averaging purposes, and the echo integration method. Two simple theorems summarizing the meaning of linearity for use with the echo integration method are stated.en_US
dc.description.sponsorshipThe financial backing and other patient support of the Norwegian Council for Fisheries Research is gratefully acknowledged.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAcoustical Society of Americaen_US
dc.relation.urihttps://doi.org/10.1121/1.389583
dc.titleLinearity of fisheries acoustics, with addition theoremsen_US
dc.typeArticleen_US
dc.identifier.doi10.1121/1.389583


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