An Algorithm for the Determination of Coating Properties from Laser-Generated and Detected Rayleigh Waves Using Wavelet Analysis: Application to Sputtered Tantalum

Abstract

We used single-source and single-detector laser-ultrasonic measurements to generate and detect Rayleigh waves on tantalum sputtered steel substrates. Group velocity dispersion curves were calculated from the single-detected signals using wavelet techniques. Theoretical dispersion curves were calculated via the Achenbach and Keshava analysis. A simplex minimization technique between theory and experiment, using known values for the substrate, allowed us to evaluate the coating parameters. The coating thickness was measured accurately with micrometers, and gives the most easily available comparisons with the output of the simplex method. The results using the straightforward wavelet method were compared with an adaptation thereof.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2002
Accession Number
ADA406403

Entities

People

  • A. Abbate
  • J. I. Frankel
  • J. Rama
  • M. A. Doxbeck
  • M. A. Hussain

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Coatings
  • Detectors
  • Dispersions
  • Elastic Properties
  • Frequency
  • Frequency Domain
  • Group Velocity
  • Lasers
  • Measurement
  • Phase Velocity
  • Rayleigh Waves
  • Shear Modulus
  • Simplex Method
  • Substrates
  • Surface Waves
  • Waves

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Operations Research
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Directed Energy
  • Directed Energy - Pulsed-Laser Deposition