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Title: Apparatus and method for measuring the thickness of a coating

Abstract

An apparatus and method for measuring the thickness of a coating adhered to a substrate. An electromagnetic acoustic transducer is used to induce surface waves into the coating. The surface waves have a selected frequency and a fixed wavelength. Interpolation is used to determine the frequency of surface waves that propagate through the coating with the least attenuation. The phase velocity of the surface waves having this frequency is then calculated. The phase velocity is compared to known phase velocity/thickness tables to determine the thickness of the coating.

Inventors:
 [1];  [1];  [1];  [1]
  1. Idaho Falls, ID
Issue Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
OSTI Identifier:
874311
Patent Number(s):
6363787
Assignee:
Bechtel BWXT Idaho LLC (Idaho Falls, ID)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; measuring; thickness; coating; adhered; substrate; electromagnetic; acoustic; transducer; induce; surface; waves; selected; frequency; fixed; wavelength; interpolation; determine; propagate; attenuation; phase; velocity; calculated; compared; velocitythickness; tables; phase velocity; surface wave; /73/

Citation Formats

Carlson, Nancy M, Johnson, John A, Tow, David M, and Walter, John B. Apparatus and method for measuring the thickness of a coating. United States: N. p., 2002. Web.
Carlson, Nancy M, Johnson, John A, Tow, David M, & Walter, John B. Apparatus and method for measuring the thickness of a coating. United States.
Carlson, Nancy M, Johnson, John A, Tow, David M, and Walter, John B. Tue . "Apparatus and method for measuring the thickness of a coating". United States. https://www.osti.gov/servlets/purl/874311.
@article{osti_874311,
title = {Apparatus and method for measuring the thickness of a coating},
author = {Carlson, Nancy M and Johnson, John A and Tow, David M and Walter, John B},
abstractNote = {An apparatus and method for measuring the thickness of a coating adhered to a substrate. An electromagnetic acoustic transducer is used to induce surface waves into the coating. The surface waves have a selected frequency and a fixed wavelength. Interpolation is used to determine the frequency of surface waves that propagate through the coating with the least attenuation. The phase velocity of the surface waves having this frequency is then calculated. The phase velocity is compared to known phase velocity/thickness tables to determine the thickness of the coating.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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Works referenced in this record:

Opto-Acoustical Inspection of Surface Layers
journal, May 1990


Laser generation and detection of surface acoustic waves: Elastic properties of surface layers
journal, January 1992


Application of ultrasonic Rayleigh waves to thickness measurement of metallic coatings
journal, January 1995