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Optical Engineering

Selective imaging of sound sources in air using phase-calibrated multiwavelength digital holographic reconstructions
Author(s): Erik Olsson
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Paper Abstract

A method for selective imaging using multiwavelength digital holographic reconstructions and the phase response of a sound source is demonstrated. Several sound measurements, using laser vibrometry, and digital reconstructions are made for several frequencies of the sound field emitted from two ultrasound transducers with different phase characteristics. Adding the reconstructed complex amplitudes together and applying a filter derived from the standard deviation over the phases for the different reconstructions makes possible a selective imaging of primary sources. When the imaging method is calibrated for a certain phase response, only primary sources with that particular phase response are imaged. Other sources and unwanted speckles are efficiently suppressed. The depth resolution obtained is 3 wavelengths.

Paper Details

Date Published: 1 July 2007
PDF: 9 pages
Opt. Eng. 46(7) 075801 doi: 10.1117/1.2752826
Published in: Optical Engineering Volume 46, Issue 7
Show Author Affiliations
Erik Olsson, Luleå Univ. of Technology (Sweden)

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