Tank measurements of scattering from a resin-filled fiberglass spherical shell with internal flaws

Teseï, Alessandra; Guerrini, Piero; Zampolli, Mario

doi:10.1121/1.2945701

Cited by 15 publications

(2 citation statements)

References 29 publications

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“…The perturbations are accepted according to Eq. (17) with T ¼ 4. The D i values for each parameter and the bounds for the parameters are given in Table II shown in Fig.…”

Section: B Simulated Annealing Inversionmentioning

confidence: 99%

Inversion for a moving spherical target's positional, structural, and speed parameters

Fawcett¹,

Dosso

2013

The Journal of the Acoustical Society of America

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The broadband scattering characteristics of a target may be used to distinguish its echoes from those of clutter. In a shallow water situation, the echo from the target will consist of a sequence of pulses corresponding to the various coherent combinations of incident and backscattered multipath arrivals. Thus, the interference effects of the waveguide propagation can have a significant effect upon the received echo and thus also affect the classification of the target from the echo. In addition, the target may be moving, in which case the received echo is also Doppler-shifted. The purpose of this paper is to investigate the simultaneous determination of a spherical target's position (range and depth) within a waveguide, its radial speed, its radius, its shell thickness, and the elastic parameters of the shell. It will be shown that many of these parameters can be accurately estimated from a single wideband echo, even in the presence of significant noise. The marginal probability distributions of the parameter values will also be investigated. It will be seen that the positional and speed parameters of the sphere can be determined to high precision. The other parameters are determined with varying degrees of precision.

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“…The perturbations are accepted according to Eq. (17) with T ¼ 4. The D i values for each parameter and the bounds for the parameters are given in Table II shown in Fig.…”

Section: B Simulated Annealing Inversionmentioning

confidence: 99%

Inversion for a moving spherical target's positional, structural, and speed parameters

Fawcett¹,

Dosso

2013

The Journal of the Acoustical Society of America

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show abstract

“…For example, epoxy-resin has the following longitudinal and transversal sound speeds, given with their corresponding attenuation coefficients [14]:…”

Section: B Comparison Between High Frequency Sas and Low Frequency Sasmentioning

confidence: 99%

Study, Design and Concept of Low Frequency Sas

PAILHAS,

PETILLOT,

CAPUS

et al. 2023

Synthetic Aperture Sonar and Radar 2010

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In the MCM (Mine Counter Measure) context, a lot of effort has been put in imagery systems and especially in high frequency sonar. The latest generation of sonar, SAS (Synthetic Aperture Sonar) systems, has been developed in the last 15 years and provides a new powerful tool for mine detection, identification and classification. The main advantage of SAS systems is a resolution close to the wavelength even at long range. A high frequency SAS system has been developed at NURC, the MUSCLE vehicle (300kHz centre frequency) but, despite the extremely good quality of the SAS images, ambiguities between mine-like objects cannot always be resolved. This study investigates how low frequency SAS systems (LF-SAS) could address the two main limitations of the present systems linked essentially to the sound absorption at high frequencies: providing imagery inside the target and detecting buried targets. Synthetic SAS images have been generated and studied in order to demonstrate the capability of LF-SAS to provide information of the inside of targets. We demonstrate that the inner resonances of objects are visible and exploitable in these LF-SAS images. Most of the time the reverberation level (RL) of the seafloor is the main limiting factor in the interpretation of sonar images. A computation of the RL has been done using the small perturbation theory on a rough seabed and we demonstrate that the first resonant echoes are still visible relative to the RL.

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Approximate solution for acoustic scattering by a nonlinear composite beam

Younesian

2018

Nonlinear Dyn

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Tank measurements of scattering from a resin-filled fiberglass spherical shell with internal flaws

Cited by 15 publications

References 29 publications

Inversion for a moving spherical target's positional, structural, and speed parameters

Inversion for a moving spherical target's positional, structural, and speed parameters

Study, Design and Concept of Low Frequency Sas

Approximate solution for acoustic scattering by a nonlinear composite beam

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