Time reversal acousto-seismic method for land mine detection

Sutin, Alexander; Johnson, Paul A.; TenCate, James A.; Sarvazyan, Armen

doi:10.1117/12.609838

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…The TRA Focusing Systems (TRA FS) are able to focus and stir ultrasound beams in a 3D volume using just a few piezoceramic transducers glued to the facets of a solid (aluminum) block. The TRA FS can be applied to biomedical imaging [4][5][6], nondestructive testing [7][8][9][10], and land mine detection [11][12][13]. The prediction of the TRA-focused signals and the formation of the focused signals with desired form and frequency content is important for these and other TRA FS applications.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic focused waveform generation using time reversal acoustic focusing system

et al. 2008

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The concept of Time Reversal Acoustics (TRA) provides an elegant possibility of both temporal and spatial concentrating of acoustic energy in highly inhomogeneous media. We explored the possibility of generating acoustical signals with arbitrary waveforms using the TRA Focusing System (TRA FS). A method has been developed to predict TRAfocused ultrasound waveforms and spatial distribution by using the measurements of transfer function of transfer function relating the signal at the TRA transmitter to that at the focusing point.The developed approach for TRA-focused signal waveform prediction from the results of direct signal measurements was tested on ten-channel TRA FS based on aluminum resonator with glued piezotransducers. The TRA FS operated in the frequency band of 100-1000 kHz.The formation of ultrasonic signals with various envelopes was demonstrated experimentally. The calculated and experimentally measured waveforms and spatial distributions were practically identical. We formed triangular, rectangular, and amplitude modulated tone burst signals with different modulation frequencies in the focal region. The level of side lobes in the generated signals was much lower than that for standard TRA focusing.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic focused waveform generation using time reversal acoustic focusing system

et al. 2008

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“…This desire stems from the use of time reversal to enhance the response of buried objects by focusing seismic energy in time and space. [7][8][9][10] Norville and Scott 11 report an experimental study of time-reversal focusing of elastic surface waves scattered by a buried object. In that work, they also describe an algorithm for estimating the surface motion detected by the LDVs by iterative convolution of an appropriate Green's function with the response due to each source.…”

Section: Introductionmentioning

confidence: 99%

Green’s functions for a volume source in an elastic half-space

Zabolotskaya¹,

Ilinskii²,

Hay³

et al. 2012

The Journal of the Acoustical Society of America

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Green's functions are derived for elastic waves generated by a volume source in a homogeneous isotropic half-space. The context is sources at shallow burial depths, for which surface (Rayleigh) and bulk waves, both longitudinal and transverse, can be generated with comparable magnitudes. Two approaches are followed. First, the Green's function is expanded with respect to eigenmodes that correspond to Rayleigh waves. While bulk waves are thus ignored, this approximation is valid on the surface far from the source, where the Rayleigh wave modes dominate. The second approach employs an angular spectrum that accounts for the bulk waves and yields a solution that may be separated into two terms. One is associated with bulk waves, the other with Rayleigh waves. The latter is proved to be identical to the Green's function obtained following the first approach. The Green's function obtained via angular spectrum decomposition is analyzed numerically in the time domain for different burial depths and distances to the receiver, and for parameters relevant to seismo-acoustic detection of land mines and other buried objects.

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