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Title: Detection and monitoring of changes in metallic structures using multimode acoustic signals

Abstract

Methods for detecting and monitoring changes in mechanical structures and in walls of pipes, vessels and storage tanks, using muitimode acoustic signal propagation and detection, are described. Acoustic signals having chosen amplitude-time-frequency characteristics excite multiple modes in the structure under investigation, are generated and received at a small number of accessible locations, such as the ends of pipes and the tops and bottoms of vessels and storage tanks, with the inspection region between transmit and receive transducers. Small mechanical changes lead to acoustic scattering and attenuation among the various modes, which are detectable as changes in received signal intensity. Such changes may include material loss, material conversion and material addition. Once the structure is characterized in a known condition, the present method may be used to monitor the structure at a later time to determine whether changes have taken place. Methods for effective temperature compensation are also described. In addition, various pipe geometries and complex pipe geometries involving elbows, flanges, and the like can be monitored.

Inventors:
; ;
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1600273
Patent Number(s):
10473625
Application Number:
15/751,429
Assignee:
Chevron U.S.A. Inc. (San Ramon, CA); Triad National Security, LLC (Los Alamos, CA)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G - PHYSICS G01 - MEASURING G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Patent
Resource Relation:
Patent File Date: 08/12/2016
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Findikoglu, Alp T., Sinha, Dipen N., and Chapman, Daniel R. Detection and monitoring of changes in metallic structures using multimode acoustic signals. United States: N. p., 2019. Web.
Findikoglu, Alp T., Sinha, Dipen N., & Chapman, Daniel R. Detection and monitoring of changes in metallic structures using multimode acoustic signals. United States.
Findikoglu, Alp T., Sinha, Dipen N., and Chapman, Daniel R. Tue . "Detection and monitoring of changes in metallic structures using multimode acoustic signals". United States. https://www.osti.gov/servlets/purl/1600273.
@article{osti_1600273,
title = {Detection and monitoring of changes in metallic structures using multimode acoustic signals},
author = {Findikoglu, Alp T. and Sinha, Dipen N. and Chapman, Daniel R.},
abstractNote = {Methods for detecting and monitoring changes in mechanical structures and in walls of pipes, vessels and storage tanks, using muitimode acoustic signal propagation and detection, are described. Acoustic signals having chosen amplitude-time-frequency characteristics excite multiple modes in the structure under investigation, are generated and received at a small number of accessible locations, such as the ends of pipes and the tops and bottoms of vessels and storage tanks, with the inspection region between transmit and receive transducers. Small mechanical changes lead to acoustic scattering and attenuation among the various modes, which are detectable as changes in received signal intensity. Such changes may include material loss, material conversion and material addition. Once the structure is characterized in a known condition, the present method may be used to monitor the structure at a later time to determine whether changes have taken place. Methods for effective temperature compensation are also described. In addition, various pipe geometries and complex pipe geometries involving elbows, flanges, and the like can be monitored.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {11}
}

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