NDI using mm-wave resonant techniques

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Description

Millimeter wave resonant measurements are commonly used for surface and near-surface materials characterization including the detection of cracks and defects, analysis of semiconducting and dielectric materials, and analysis of metallic electrical properties beneath coatings. Recent work has also shown the approach to be useful in evaluating corrosion products and the detection of incipient corrosion and corrosion cracking. In the analysis area, complex permittivity data of the corrosion products can be extracted, usually with accuracy of a few percent or better, to aid in identification of the product and possibly of mechanisms. In the detection area, corrosion-related cracks of order 100{mu}m ... continued below

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15 p.

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Martens, J.S.; Sachtjen, S. & Sorensen, N.R. August 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Millimeter wave resonant measurements are commonly used for surface and near-surface materials characterization including the detection of cracks and defects, analysis of semiconducting and dielectric materials, and analysis of metallic electrical properties beneath coatings. Recent work has also shown the approach to be useful in evaluating corrosion products and the detection of incipient corrosion and corrosion cracking. In the analysis area, complex permittivity data of the corrosion products can be extracted, usually with accuracy of a few percent or better, to aid in identification of the product and possibly of mechanisms. In the detection area, corrosion-related cracks of order 100{mu}m or less near the surface have been detected and corrosion products have been detected beneath a variety of paints. Surface preparation requirements are minimal, particularly compared to some optical techniques, giving increased hope of field applicability. A number of examples of NDI on aircraft related materials and structures will be presented along with an assessment of detection and accuracy limits.

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15 p.

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OSTI as DE95016100

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  • 1995 International mechanical engineering congress and exhibition, San Francisco, CA (United States), 12-17 Nov 1995

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  • Other: DE95016100
  • Report No.: SAND--95-1651C
  • Report No.: CONF-951135--16
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 100225
  • Archival Resource Key: ark:/67531/metadc621509

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  • August 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • June 23, 2016, 10:06 a.m.

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Martens, J.S.; Sachtjen, S. & Sorensen, N.R. NDI using mm-wave resonant techniques, article, August 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc621509/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.