Locating primary sound sources in scattering media using multifrequency digital holographic reconstruction

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 ultrasoun...

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Bibliographic Details
Published in:Optical Engineering 2006-01, Vol.45 (1), p.015801-015806
Main Authors: Olsson, Erik, Sjo¨dahl, Mikael, Zipser, Lothar
Format: Article
Language:English
Subjects:
Experimental Mechanics
Experimentell mekanik
laser Doppler velocimetry
photoacoustics
ultrasonics
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Summary: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.
ISSN:0091-3286
1560-2303
1560-2303
DOI:10.1117/1.2162032