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Optical Engineering

Locating primary sound sources in scattering media using multifrequency digital holographic reconstruction
Author(s): Erik Olsson; Mikael Sjödahl; Lothar Zipser
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Paper Abstract

Multifrequency digital holographic reconstructions of primary sound sources embedded in scattering media are demonstrated. The sound field is measured with a scanning laser Doppler vibrometer (LDV) and broadening of the spectral content of the sound source is achieved by tuning the primary ultrasound (US) transducer around its resonance frequency. The results show that combining the complex amplitudes from the different frequency reconstructions results in a reduced susceptibility to multiple scattered sound and makes possible a quite thorough localization of the primary sound source. The depth resolution obtained is 11 US frequencies. This depth sensitivity is improved even further to only 2.8 wavelengths by applying a filter determined from the standard deviation over the phases.

Paper Details

Date Published: 1 January 2006
PDF: 6 pages
Opt. Eng. 45(1) 015801 doi: 10.1117/1.2162032
Published in: Optical Engineering Volume 45, Issue 1
Show Author Affiliations
Erik Olsson, Luleå Univ. of Technology (Sweden)
Mikael Sjödahl, Luleå Univ. of Technology (Sweden)
Lothar Zipser, Hochschule fuer Technik und Wirtschaft (Germany)


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