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Classification of a cylindrical target buried in a thin sand-water mixture using acoustic spectra
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10.1121/1.3298430
/content/asa/journal/jasa/127/3/10.1121/1.3298430
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/3/10.1121/1.3298430
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of experimental setup. In monostatic method, transducer 1 is used as emitter and receiver. In bistatic method, transducer 1 is used as emitter and transducer 2 is used as receiver.

Image of FIG. 2.
FIG. 2.

Theoretical results obtained from an infinite length stainless steel cylindrical shell immersed in water and excited perpendicularly to its axis: (A) form function, (B) backscattered time signal, and (C) zoom of the backscattering time signal.

Image of FIG. 3.
FIG. 3.

Theoretical resonance spectra. (A) Cylindrical shell in water (arrows: wave resonances, black point: wave resonances). (B) Cylindrical shell in fluid with sand-water mixture parameters (black asterisk: wave resonances). Dashed lines show that the resonances of the wave are at the same frequencies on the two spectra.

Image of FIG. 4.
FIG. 4.

Experimental spectra obtained when the cylindrical object is in free water: (A) backscattering spectrum and (B) resonance spectrum.

Image of FIG. 5.
FIG. 5.

(A) Experimental impulse time signal when the object is buried 2 cm into the sand-water mixture and (B) zoom on elastic echoes.

Image of FIG. 6.
FIG. 6.

Experimental spectra obtained from the impulse time signal of Fig. 5 when the object is buried 2 cm into the sand-water mixture. (A) Backscattering spectrum obtained from the total impulse time signal. (B) Backscattering spectrum obtained after removing the reverberation echoes. Arrows indicate the wave resonance positions. (C) Experimental resonance spectra obtained after removing the specular and reverberation echoes.

Image of FIG. 7.
FIG. 7.

Monostatic scanning of the sand-water mixture in which the object is buried (2 cm deep). (A) All the time signals, the white rectangular zone indicates the signal part used to calculate the resonance spectra. (B) All the resonance spectra. (C) A sample of resonance spectrum.

Image of FIG. 8.
FIG. 8.

Bistatic scanning of the sand-water mixture in which the object is buried (2 cm deep). (A) All the time signals, the white rectangular zone indicates the signal part used to calculate the resonance spectra. (B) All the resonance spectra. (C) A sample of resonance spectrum.

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/content/asa/journal/jasa/127/3/10.1121/1.3298430
2010-03-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Classification of a cylindrical target buried in a thin sand-water mixture using acoustic spectra
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/3/10.1121/1.3298430
10.1121/1.3298430
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