NDLI: Phase fluctuations of focused low-frequency sound fields in shallow water

Content Provider	Springer Nature Link
Author	Lunkov, A. A. Petnikov, V. G.
Copyright Year	2011
Abstract	Numerical experiments are carried out to study the phase fluctuations of a focused low-frequency sound field on an oceanic shelf. The focusing of sound at a distance of several kilometers is simulated using the phase conjugation of sound waves. Perturbations of the medium are represented by high-frequency (>1 cph) background internal waves and by the wind waves on the ocean surface. It is shown that, for a focused sound field at frequencies of several hundreds of hertz, the phase fluctuations do not exceed π and can be measured against the background of acoustic noise typical of shallow-water regions of the ocean. The fluctuation magnitude can be reduced approximately by half through the optimal choice of the mode composition. In the presence of such fluctuations, it is possible to measure the relative variations of the length of a stationary acoustic path with an accuracy of 1 m or better at a wind speed no greater than 10 m/s and a typical intensity of background internal waves.
Starting Page	672
Ending Page	680
Page Count	9
File Format	PDF
ISSN	10637710
Journal	Acoustical Physics
Volume Number	57
Issue Number	5
e-ISSN	15626865
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-09-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	shallow water acoustics acoustic monitoring measuring methods Acoustics
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Focusing of low-frequency sound fields in shallow water

Sound fluctuations resulting from mode coupling in shallow-water internal waves

Energy fluctuations of high-frequency sound signals in a shallow water in the presence of nonlinear internal waves

The coherence of low-frequency sound in shallow water in the presence of internal waves

Effect of random hydrodynamic inhomogeneities on low frequency sound propagation loss in shallow water

Space-time coherence of low-frequency acoustic waves in a shallow-water area with fluctuating parameters

Simulation of low-frequency sound propagation in an irregular shallow-water waveguide with a fluid bottom

Error of the local sound field’s maximum frequency shifts in shallow water

Features of the energy structure of acoustic fields in the ocean with two-dimensional random inhomogeneities

Phase fluctuations of focused low-frequency sound fields in shallow water

Similar Documents

Focusing of low-frequency sound fields in shallow water

Sound fluctuations resulting from mode coupling in shallow-water internal waves

Energy fluctuations of high-frequency sound signals in a shallow water in the presence of nonlinear internal waves

The coherence of low-frequency sound in shallow water in the presence of internal waves

Effect of random hydrodynamic inhomogeneities on low frequency sound propagation loss in shallow water

Space-time coherence of low-frequency acoustic waves in a shallow-water area with fluctuating parameters

Simulation of low-frequency sound propagation in an irregular shallow-water waveguide with a fluid bottom

Error of the local sound field’s maximum frequency shifts in shallow water

Features of the energy structure of acoustic fields in the ocean with two-dimensional random inhomogeneities

Phase fluctuations of focused low-frequency sound fields in shallow water