Sound field monitoring by tomographic electronic speckle pattern interferometry

A technique for 3-D selective imaging of sound sources is described analytically and demonstrated experimentally. Onedimensional recordings of the acoustic field is measured using laser vibrometry. By applying digital holographic and tomographic algorithms to the acquired 1-D data, the full 3-D complex amplitude is reconstructed. The use of multiple frequencies in the spectral content of the acoustic field gives a number of advantages: higher spatial resolution, less noise in the reconstructed image, less sensitivity to noise in the measurements, and the possibility to perform selective imaging. Theory for all three steps-the measurement of sound using light, numerical propagation of waves, and finally the tomographic reconstruction in the process are given. In the experiment, the positions of three ultrasound sources are accurately determined and two different types of transducers are distinguished from each other. This multiwavelength technique could show to be a useful addition to optoacoustic imaging.

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Non-destructive testing with double-pulsed laser ESPI

Wang¹,

Wang²,

Tan³

2006

Insight - Non-Destructive Testing and Condition Monitoring

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Sound field monitoring by tomographic electronic speckle pattern interferometry

Cited by 3 publications

References 10 publications

Visualization of acoustic wave using coherent gradient sensing and Fourier fringe analysis

Visualization of acoustic wave using coherent gradient sensing and Fourier fringe analysis

Three-dimensional selective imaging of sound sources

Non-destructive testing with double-pulsed laser ESPI

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