NDLI: "Acousticore", A new concept in acoustic prospecting for minerals and preconstruction surveying

Content Provider	IEEE Xplore Digital Library
Author	Wright, H. Miles, P.
Copyright Year	1973
Description	Author affiliation: Bolt Beranek and Newman Inc., Cambridge, MA, USA (Wright, H.)
Abstract	Acousticore is a technique for quantitative measurement of the specific acoustic impedance of marine sediments. A broadband impulsive source and two colinear receivers of fixed spacing are oriented vertically. Acoustic pressure received at the two points is used to compute downgoing and upgoing waveforms which are, in turn, numerically deconvolved to obtain the reflection impulse-response function of sediments below the device. Theoretical relationships are presented between the reflection impulse-response function and sediment acoustic impedance which assume horizontal homogeneity but allow for arbitrary vertical variations including continuous change in impedance. If the range of impedance variation is modest (perhaps 2:1), e.g., in "normal" unconsolidated sediments, the theoretical relationship is simply:\int\max{t}\min{0}h(u)du=1/2 ln[z(t)/z_{0}]where (t) is the reflection impulse-response function and z(t) is impedance as a function of acoustic travel time. Marine sediments encompass a spectrum of impedances, as substantiated by published data regarding acoustic properties of sediments. These data, which are summarized here, show that quantitative measurement of impedance is useful for discrimination between consolidated sediments, gravel, sand, clay, silt, and gassy sediments. In the case of gassy sediments we obtain an undissolved gas percentage profile versus depth (acoustic travel time). Laboratory and field data are shown illustrating the Acousticore technique and its ability to measure acoustic impedance versus depth for multi-layered sediments.
Starting Page	349
Ending Page	349
File Size	60384
Page Count	1
File Format	PDF
DOI	10.1109/OCEANS.1973.1161209
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1973-09-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sediments Laboratories Acoustic measurements Impedance measurement
Content Type	Text
Resource Type	Article

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

A new technique for detailed acoustic current profiles in the continental shelf wave bottom boundary layer

A New Seismo-acoustic Probe For Seabed Measurements

Sediment Classification by Seismic Reflectivity

Acoustic Phase Technique for Measuring Stress Region in Materials

Interpretation of acoustic backscatter measurements using a cross-correlation technique to evaluate near-bed current velocities

Novel Acoustics Applications/Seafloor Engineering

CCP-correlation current profiler a comparison between laboratory and field measurements

Analysis of Acoustic Properties of the Seafloor Sediments in the South China Sea

Design and Construction of a Specified Rough Interface for Calibrated Acoustic Measurements

"Acousticore", A new concept in acoustic prospecting for minerals and preconstruction surveying

Similar Documents

A new technique for detailed acoustic current profiles in the continental shelf wave bottom boundary layer

A New Seismo-acoustic Probe For Seabed Measurements

Sediment Classification by Seismic Reflectivity

Acoustic Phase Technique for Measuring Stress Region in Materials

Interpretation of acoustic backscatter measurements using a cross-correlation technique to evaluate near-bed current velocities

Novel Acoustics Applications/Seafloor Engineering

CCP-correlation current profiler a comparison between laboratory and field measurements

Analysis of Acoustic Properties of the Seafloor Sediments in the South China Sea

Design and Construction of a Specified Rough Interface for Calibrated Acoustic Measurements

"Acousticore", A new concept in acoustic prospecting for minerals and preconstruction surveying