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Broadband acoustic scattering measurements of underwater unexploded ordnance (UXO)
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10.1121/1.2821794
/content/asa/journal/jasa/123/2/10.1121/1.2821794
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/2/10.1121/1.2821794
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Structural Acoustic ID versus Imaging.

Image of FIG. 2.
FIG. 2.

(Color online) NRL Laboratory for Structural Acoustics. One million gallon pool facility with adiabatic walls and acoustic coatings, vibration isolation system, and complex acoustic scanners, sources, and processing algorithms.

Image of FIG. 3.
FIG. 3.

(Color online) Experimental Measurement Geometry. The target is placed in the plane-wave region of (1) a near-field cylindrical source at low frequency (LF) or (2) a far-field piston source at high frequency (HF) with a nearly co-located broadband short vertical receiver array with the former and a small point-like hydrophone receiver with the latter. The target (which is from the receiver) is rotated over a full in increments of .

Image of FIG. 4.
FIG. 4.

Measured Target Strength & Target Photo. Magnitude of the target strength coded in color map versus frequency and target aspect for the mortar round.

Image of FIG. 5.
FIG. 5.

Measured Target Strength & Target Photo. Magnitude of the target strength coded in color map versus frequency and target aspect for the artillery shell.

Image of FIG. 6.
FIG. 6.

Measured Target Strength & Target Photo. Magnitude of the target strength coded in color map versus frequency and target aspect for the rocket warhead.

Image of FIG. 7.
FIG. 7.

Measured Target Strength & Target Photo. Magnitude of the target strength coded in color map versus frequency and target aspect for the mortar round.

Image of FIG. 8.
FIG. 8.

Measured Target Strength & Target Photo. Magnitude of the target strength coded in color map versus frequency and target aspect for the large rock.

Image of FIG. 9.
FIG. 9.

Measured Target Strength & Target Photo. Magnitude of the target strength coded in color map versus frequency and target aspect for the cinder block.

Image of FIG. 10.
FIG. 10.

(Color online) Maximum Detection Range for two target strength levels, 0 and , versus frequency.

Image of FIG. 11.
FIG. 11.

Measured Target Strength & Calculated Rigid Response. Semilog plot of the magnitude of the target strength coded in color map versus frequency and target aspect for the rocket. (Left: measured; right: computed using finite-element-based scattering code.)

Image of FIG. 12.
FIG. 12.

TS (dB) at versus frequency for the mortar round: measured (solid) and as computed (dashed) using Eq. (4).

Image of FIG. 13.
FIG. 13.

Time-angle plots for the scattering returns from the rocket. The contours labeled A and B represent the minimum and maximum acoustic arrival times, respectively. They are associated with the front (A) and back (B) of the target.

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/content/asa/journal/jasa/123/2/10.1121/1.2821794
2008-02-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Broadband acoustic scattering measurements of underwater unexploded ordnance (UXO)
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/2/10.1121/1.2821794
10.1121/1.2821794
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