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dc.contributor.authorSvee, Astridnb_NO
dc.date.accessioned2014-12-19T13:42:29Z
dc.date.accessioned2015-12-22T11:39:39Z
dc.date.available2014-12-19T13:42:29Z
dc.date.available2015-12-22T11:39:39Z
dc.date.created2007-03-28nb_NO
dc.date.issued2007nb_NO
dc.identifier122229nb_NO
dc.identifier.isbn978-82-471-1027-0nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/2368785
dc.description.abstractRecent years have brought cross-disciplinary focus on possibilities, constraints and consequences of large scale zooplankton harvesting. Development of acoustic measurement technology is an important part of that work. Because of the small size of the plankton, the measurement frequencies have to be high compared to fishery acoustics. Based on a model of the size and shape of the plankton and its physical properties, the use of multiple frequency measurements will allow inverse modeling of the size and concentration of plankton. This thesis presents the development and test results of an Acoustical Plankton Recorder (APR). The system uses three frequencies, 200 kHz, 710 kHz, and 1 MHz. The system parameters are designed with a focus on measuring the zooplankton Calanus finmarchicus, which plays an important role in the Norwegian Sea ecosystem. The APR is a prototype instrument built to gain experience for future generations of instruments for plankton measurements. Different aspects of multi-frequency acoustical measurements are discussed with a focus on uncertainties and critical factors. The results from various experiments and measurements are presented. The estimated concentration of scatterers from data recovered by the Acoustical Plankton Recorder shows good agreement with biological samples.nb_NO
dc.languageengnb_NO
dc.publisherFakultet for informasjonsteknologi, matematikk og elektroteknikknb_NO
dc.relation.ispartofseriesDoktoravhandlinger ved NTNU, 1503-8181; 2007:46nb_NO
dc.titleDevelopment and Testing of an Acoustic Plankton Recordernb_NO
dc.typeDoctoral thesisnb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for elektronikk og telekommunikasjonnb_NO
dc.description.degreedr.ing.nb_NO


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