Sonar Systems

Björnö, L.

doi:10.1016/b978-0-12-811240-3.00010-2

Cited by 13 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the line of sight is blocked, source localization cannot be done. Such a requirement has necessarily limited source localization to an obstacle-free space, regardless if it is an active source localization equipment such as radar 1,2,3 to detect an aircraft in air and sonar to catch a submarine underwater, 4,5,6 or a passive source localization approach using triangulation, 7,8,9 beamforming, 10,11,12 and time reversal 13,14,15 to locate sound sources in both air and underwater.…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted See-through Technology for Locating Sound Sources Inside a Structure

Wu,

Lu,

Ernest

et al. 2023

Preprint

View full text Add to dashboard Cite

A laser-assisted see-through technology is developed to locate sound sources inside a structure and to analyze the interior sound field. Six lasers were utilized to measure the normal velocities on the exterior surface simultaneously, which were used to locate sound sources inside a structure through a passive sonic detection and ranging algorithm. Next, the Helmholtz equation least squares method was applied to reconstruct the interior sound field, and computer tomography utilized to scan space and time simultaneously to observe the changes of the interior sound field over time. If signals are time invariant, we can do all these with two lasers, one being fixed and another measuring the normal surface velocities and establish the transfer functions with respect to the stationary laser sequentially. This laser-assisted see-through technology was validated experimentally and employed to view the aerodynamically-induced sound field generated by a blower inside a projector. The reason that we can break the barrier in sound source localization is that measurements are taken on an impenetrable surface, whose normal velocity is continuous across the thickness of the surface. This discovery is groundbreaking. It embodies a significant advancement in sound source localization, and opens the door to a class of applications presently unattainable.

show abstract

Section: Introductionmentioning

confidence: 99%

Laser-assisted See-through Technology for Locating Sound Sources Inside a Structure

Wu,

Lu,

Ernest

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Sparse Arrays for Sonar

Adhikari,

Wage

2023

Sparse Arrays for Radar, Sonar, and Communications

View full text Add to dashboard Cite

Quantifying Depth of Burial and Composition of Shallow Buried Archaeological Material: Integrated Sub-bottom Profiling and 3D Survey Approaches

Winton

2019

3D Recording and Interpretation for Maritime Archaeology

View full text Add to dashboard Cite

This chapter presents proof of concept results from a program of in situ experimental and shipwreck survey measurements using non-linear (parametric) sub-bottom profiler (SBP) acoustic technology. Currently adopted acoustic methods have practical limitations for in situ management purposes for underwater sites with buried archaeological material. Sidescan and multibeam sensors do not quantify material buried below the seabed; linear SBP surveys are challenging to operate in very shallow water and have difficulties with respect to interpretation in the top 30 cm of the seabed; and confidence estimates for parametric SBP depth of burial measurements have yet to be published. The prime purposes of this research, consequently, are: to quantify shallow buried archaeological sites in 3D with confidence estimates, by measuring the depth of sediment cover, thickness and lateral extent of buried archaeological material; and to investigate relationships between acoustic waveform parameters and the type and degradation condition of that buried material. This improved measurement and interpretation capability, when combined with the other geophysical search tools such as multibeam echo sounders and magnetometers, will also aid in the assessment of the archaeological research potential of underwater sites.

show abstract

Sonar Systems

Cited by 13 publications

References 39 publications

Laser-assisted See-through Technology for Locating Sound Sources Inside a Structure

Laser-assisted See-through Technology for Locating Sound Sources Inside a Structure

Sparse Arrays for Sonar

Quantifying Depth of Burial and Composition of Shallow Buried Archaeological Material: Integrated Sub-bottom Profiling and 3D Survey Approaches

Contact Info

Product

Resources

About