NDLI: An Acoustic Ocean-Transport Meter

Content Provider	IEEE Xplore Digital Library
Author	Chaplin, G. Watts, D.
Copyright Year	1986
Description	Author affiliation: University of Rhode Island, Kingston, RI, USA (Chaplin, G.)
Abstract	An acoustic method is discussed for measuring mean currents by accurately measuring time-of-flight differencesfor sound to travel in two opposite directions along a path in the ocean. The acoustic path is a "sing-around" vertical triangle with a base about 3 km long; thedetermines the mean horizontal component of velocity averaged through the water column. The measurements are made by adapting a programmable inverted echo sounder (IES) and two transponders. These are used in a master/ slave mode where the IES transceiver records all data and provides the timing reference. The two slave transponders are each located -3 km from the master, all near the bottom. Each master / slave pair and the ocean surface form two vertical triangular "sing-around" loops whose planes are orthogonal. The sources of error such as detector scatter, mooring motion, and variations in sound speed are discussed. The results of the field tests are presented along with comparisons against Pegasus vertical profiles of velocity.
Starting Page	426
Ending Page	429
File Size	350527
Page Count	4
File Format	PDF
DOI	10.1109/OCEANS.1986.1160469
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1986-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sea measurements Sea surface Velocity measurement Time measurement Timing Transponders Instruments Difference equations Frequency synchronization Accuracy
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