Apparatus and method for measuring the thickness of a coating

Carlson, Nancy M; Johnson, John A; Tow, David M; Walter, John B

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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:

Carlson, Nancy M ^[1]; Johnson, John A ^[1]; Tow, David M ^[1]; Walter, John B ^[1]

Idaho Falls, ID

Issue Date:: Tue Jan 01 00:00:00 EST 2002

Research Org.:: Idaho National Laboratory (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 G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
G01B17/025 - {for measuring thickness of coating}

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N2291/011 - Velocity or travel time
G01N2291/014 - Resonance or resonant frequency
G01N2291/0231 - Composite or layered materials
G01N2291/02854 - Length, thickness
G01N2291/0423 - Surface waves, e.g. Rayleigh waves, Love waves
G01N2291/048 - Transmission, i.e. analysed material between transmitter and receiver
G01N2291/102 - one emitter, one receiver
G01N29/07 - by measuring propagation velocity or propagation time of acoustic waves
G01N29/11 - by measuring attenuation of acoustic waves
G01N29/12 - by measuring frequency or resonance of acoustic waves {
G01N29/2412 - {using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]

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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.

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                    Carlson, Nancy M, Johnson, John A, Tow, David M, & Walter, John B. Apparatus and method for measuring the thickness of a coating.  United States.

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                    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.

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@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         = {Tue Jan 01 00:00:00 EST 2002},

  month        = {Tue Jan 01 00:00:00 EST 2002}

}

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Works referenced in this record:

Opto-Acoustical Inspection of Surface Layers
journal, May 1990

Lorenz, M.; Vogel, J. A.; Bruinsma, A. J. A.
Nondestructive Testing and Evaluation, Vol. 5, Issue 2-3
https://doi.org/10.1080/10589759008952964

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

Neubrand, A.; Hess, P.
Journal of Applied Physics, Vol. 71, Issue 1
https://doi.org/10.1063/1.350747

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

Lakestani, Fereydoun; Coste, Jean-François; Denis, René
NDT & E International, Vol. 28, Issue 3
https://doi.org/10.1016/0963-8695(95)00010-U

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Similar Records

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

Abstract

Citation Formats

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

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