Projection of acoustic fields using the Fourier transform

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dc.contributor.advisorDenbigh, P Nen_ZA
dc.contributor.authorYudelman, Errolen_ZA
dc.date.accessioned2014-09-22T07:51:13Z
dc.date.available2014-09-22T07:51:13Z
dc.date.issued1985en_ZA
dc.description.abstractA method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids. Each sinusoid gives rise to a plane wave whose direction is given by the wavelength of the sinusoid. The plane waves are summed at the plane of interest to obtain the resulting pressure field. Errors are introduced when projecting pressure fields by large distances. These are circumvented by observing that the farfield pressure pattern can be found by simply taking the Fourier transform of the nearfield pressure distribution. A rectangular source is simulated on the computer; the Fourier transform technique of projecting fields is compared to a direct integration technique. The Fourier transform technique is used to back project a measured pressure pattern to detect defects on the transducer face. Measurements of pressure are made in the nearfield of a circular transducer. These measurements are forward and back projected to give the pressure and velocity at other planes.en_ZA
dc.identifier.apacitationYudelman, E. (1985). <i>Projection of acoustic fields using the Fourier transform</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/7588en_ZA
dc.identifier.chicagocitationYudelman, Errol. <i>"Projection of acoustic fields using the Fourier transform."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1985. http://hdl.handle.net/11427/7588en_ZA
dc.identifier.citationYudelman, E. 1985. Projection of acoustic fields using the Fourier transform. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Yudelman, Errol AB - A method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids. Each sinusoid gives rise to a plane wave whose direction is given by the wavelength of the sinusoid. The plane waves are summed at the plane of interest to obtain the resulting pressure field. Errors are introduced when projecting pressure fields by large distances. These are circumvented by observing that the farfield pressure pattern can be found by simply taking the Fourier transform of the nearfield pressure distribution. A rectangular source is simulated on the computer; the Fourier transform technique of projecting fields is compared to a direct integration technique. The Fourier transform technique is used to back project a measured pressure pattern to detect defects on the transducer face. Measurements of pressure are made in the nearfield of a circular transducer. These measurements are forward and back projected to give the pressure and velocity at other planes. DA - 1985 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1985 T1 - Projection of acoustic fields using the Fourier transform TI - Projection of acoustic fields using the Fourier transform UR - http://hdl.handle.net/11427/7588 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/7588
dc.identifier.vancouvercitationYudelman E. Projection of acoustic fields using the Fourier transform. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1985 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/7588en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.titleProjection of acoustic fields using the Fourier transformen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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