Methods for Calibrating Basin-Wide Hydroacoustic Propagation in the Indian Ocean

Blackman, D ; de Groot-Hedlin, C ; Orcutt, J A ; Harben, P H ; Clarke, D B ; Ramirez, A L

Lawrence Livermore National Laboratory

关键词: Calibration;    Testing;    Monitoring;    Acoustics;    Planning;   

DOI  :  10.2172/15011808
RP-ID  :  UCRL-TR-207323
RP-ID  :  W-7405-ENG-48
RP-ID  :  15011808

美国|英语

来源: UNT Digital Library

【 摘 要 】

This collaborative project was designed to test and compare methods for achieving full ocean basin propagation of hydroacoustic signals in the 5-100 Hz frequency band. Plans for a systematic calibration of the International Monitoring System (IMS) for nuclear testing were under consideration in 2000/2001. The results from this project provide information to guide such planning for future ocean basin calibration work. Several acoustic source types were tested during two sea-going experiments and most were successful at generating signals that propagated hundreds to thousands of km to be recorded at the Indian Ocean IMS hydrophone stations. Development and numerical modeling of imploding glass sphere sources was one component of this testing. The intent was to design a relatively simple-to-use source that is not subject to restrictions that can limit use of explosive charges, but whose signal is large enough to propagate 100-1000's km range. Analysis of IMS hydrophone data recording during the experiments was used to illustrate the extent of energy loss during signal propagation and to assess the accuracy with which the small acoustic sources could be located using methods typically employed for nuclear monitoring.