title: Enhanced nearfield acoustic holography for larger distances of reconstructions using fixed parameter Tikhonov regularization.
abstract: This paper evaluates the performance of various regularization parameter choice methods applied to different approaches of nearfield acoustic holography when a very nearfield measurement is not possible. For a fixed grid resolution, the larger the hologram distance, the larger the error in the naive nearfield acoustic holography reconstructions. These errors can be smoothed out by using an appropriate order of regularization. This study shows that by using a fixed/manual choice of regularization parameter, instead of automated parameter choice methods, reasonably accurate reconstructions can be obtained even when the hologram distance is 16 times larger than the grid resolution.
authors.affiliation: Department of Mechanical, Aerospace and Materials Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA.
authors.forename: Kanthasamy
authors.initials: K
authors.lastname: Chelliah
authors.affiliation: Department of Mechanical, Aerospace and Materials Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA.
authors.forename: Ganesh G
authors.initials: GG
authors.lastname: Raman
authors.affiliation: Energy Systems Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Ralph T
authors.initials: RT
authors.lastname: Muehleisen