Selective imaging of sound sources in air using phase-calibrated multiwavelength digital holographic reconstructions

Erik Olsson

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Selective imaging of sound sources in air using phase-calibrated multiwavelength digital holographic reconstructions

机译：Selective imaging of sound sources in air using phase-calibrated multiwavelength digital holographic reconstructions

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摘要

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.

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来源
《Optical Engineering》 |2007年第7期|075801-1-075801-9-0|共9页
作者
Erik Olsson;
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作者单位

Lulea University of Technology, Division of Experimental Mechanics, SE-97187, Lulea, Sweden;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类光学仪器;
关键词
selective imaging; digital holography; multiwavelength; ultrasonics; laser Doppler velocimetry;

Selective imaging of sound sources in air using phase-calibrated multiwavelength digital holographic reconstructions

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