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Title: Acoustic velocity measurements in materials using a regenerative method

Abstract

Acoustic energy is propagated through earth material between an electro-acoustic generator and a receiver which converts the received acoustic energy into electrical signals. A closed loop is formed by a variable gain amplifier system connected between the receiver and the generator. The gain of the amplifier system is increased until sustained oscillations are produced in the closed loop. The frequency of the oscillations is measured as an indication of the acoustic propagation velocity through the earth material. The amplifier gain is measured as an indication of the acoustic attenuation through the earth materials. The method is also applicable to the non-destructive testing of structural materials, such as steel, aluminum and concrete.

Inventors:
 [1]
  1. Alamo, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865747
Patent Number(s):
US 4566084
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
acoustic; velocity; measurements; materials; regenerative; method; energy; propagated; earth; material; electro-acoustic; generator; receiver; converts; received; electrical; signals; closed; loop; formed; variable; amplifier; connected; increased; sustained; oscillations; produced; frequency; measured; indication; propagation; attenuation; applicable; non-destructive; testing; structural; steel; aluminum; concrete; structural material; closed loop; electrical signals; electrical signal; acoustic energy; structural materials; acoustic velocity; velocity measurements; acoustic propagation; non-destructive testing; velocity measurement; acoustic attenuation; /367/73/

Citation Formats

Laine, Edwin F. Acoustic velocity measurements in materials using a regenerative method. United States: N. p., 1986. Web.
Laine, Edwin F. Acoustic velocity measurements in materials using a regenerative method. United States.
Laine, Edwin F. Wed . "Acoustic velocity measurements in materials using a regenerative method". United States. https://www.osti.gov/servlets/purl/865747.
@article{osti_865747,
title = {Acoustic velocity measurements in materials using a regenerative method},
author = {Laine, Edwin F},
abstractNote = {Acoustic energy is propagated through earth material between an electro-acoustic generator and a receiver which converts the received acoustic energy into electrical signals. A closed loop is formed by a variable gain amplifier system connected between the receiver and the generator. The gain of the amplifier system is increased until sustained oscillations are produced in the closed loop. The frequency of the oscillations is measured as an indication of the acoustic propagation velocity through the earth material. The amplifier gain is measured as an indication of the acoustic attenuation through the earth materials. The method is also applicable to the non-destructive testing of structural materials, such as steel, aluminum and concrete.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Patent:

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