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Back-Projection Algorithms for a Computer-Controlled Scanning Laser Acoustic Microscope

  • R. K. Mueller
  • W. P. Robbins
  • E. Rudd
  • Z. Q. Zhout
Part of the Acoustical Imaging book series (ACIM, volume 15)

Abstract

In this paper we evaluate the capability of a scanning laser acoustic microscope (SLAM) to produce images of buried flaws or artifacts in objects which support both shear and compressional waves. First we describe a method of imaging near-surface flaws or artifacts by surface wave insonification, and give some experimental results. We then show that a conventional SLAM does not acquire sufficient data for the back-projection imaging in solids. However appropriate spatial filtering of the acquired data can produce acceptable quasi-back-projected images of deeply buried flaws. This is shown analytically and demonstrated with some images obtained with a computer-controlled SLAM developed in our laboratory.

Keywords

Compressional Wave Surface Wave Lithium Niobate Cover Plate Bulk Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    “A Scanning Laser Acoustic Microscope with Digital Data Acquisition”, E. P. Rudd, et al., to be published Rev. of Sci. Instr.Google Scholar
  2. 2.
    “New Demodulation Scheme for Laser Scanned Acoustic Imaging Systems”, R. K. Mueller, R. L. Rylander, J. Opt. Soc. Am. 69, 407–412 (1979).CrossRefGoogle Scholar
  3. 3.
    Theory of Image Reconstruction for Scanned Laser Acoustic Microscopy, R. K. Mueller, B. Soumekh, Proc. Ultrasonics Symposium (IEEE, San Francisco, 1985) 720–724.Google Scholar
  4. 4.
    Acoustic Microscopy with Shear and Compressional Waves, R. K. Mueller, X. D. Li, to be published this volume.Google Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • R. K. Mueller
    • 1
  • W. P. Robbins
    • 1
  • E. Rudd
    • 1
  • Z. Q. Zhout
    • 2
  1. 1.Department of Electrical EngineeringUniversity of MinnesotaMinneapolisUSA
  2. 2.Wuhan Institute of PhysicsAcademia SinicaWuhan HubarThe People’s Republic of China

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