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

被引：6

作者：

Olsson, Erik ^{[1
]}

机构：

[1] Lulea Univ Technol, Div Expt Mechan, SE-97187 Lulea, Sweden

来源：

OPTICAL ENGINEERING | 2007年 / 46卷 / 07期

关键词：

selective imaging; digital holography; multiwavelength ultrasonics; laser Doppler velocimetry;

D O I：

10.1117/1.2752826

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

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. (c) 2007 Society of Photo-Optical Instrumentation Engineers.

引用

页数：9