Focused Line Source Linear Array Holography Using a Three Dimensional Computer Reconstruction System

  • H. Dale Collins
  • Tom E. Hall
  • Richard L. Wilson
Part of the Acoustical Imaging book series (ACIM, volume 9)


This paper describes a unique holographic scanning configuration and computer reconstruction technique for the inspection of thick-walled nuclear pressure vessels.

The holographic imaging system consists of a focused line source and a 120 element receiver array operating at 2.31 MHz. The source and receive arrays are aligned parallel with each other, simulating simultaneous source-receiver scanning in the mechanical scanned direction. The holographic information is obtained by mechanically scanning perpendicular to the arrays and electronically multiplexing the receiver array. This hybrid scanning configuration produces directional resolution and astigmatism in the holographic reconstruction.

The computer reconstruction system is capable of generating near-real time holographic images via an array processor and FFT operation. The system has the unique ability of integrating up to ten images into one three dimensional composite image with the options of tilt and rotation.1

A computer spatial frequency filtering program provides the unique capabilities of image enhancement and object characterization.

Experimental imaging results are presented of various objects and defects in thick-walled metals graphically illustrating the capabilities of the holographic imaging system.


Receiver Array Resolution Test Holographic Image Digital Reconstruction Computer Reconstruction 
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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  1. 1.
    Hall, Thomas and Wilson, Richard, Holosonics, Inc., Final Progress Report, EPRI, Project RP606-2-1, “Development of the Rapid Acoustical Holography Computer Reconstruction Device”, 1979.Google Scholar
  2. 2.
    Hildebrand, B. P., “Development of an Ultrasonic Analyzing System”, EPRI Report NP606-1, December 1979.Google Scholar
  3. 3.
    Keating, P. N., Acoustical Holography, Vol. 5, (edited by P. J. Green), Plenum Press, NY, 1973.Google Scholar
  4. 4.
    Collins, H. D., “Various Holographic Scanning Configurations for Under-Sodium Viewing”, AEC Research and Development Report (BNWL-1558), 1971.Google Scholar
  5. 5.
    Collins, H. D., and Brenden, B. B., Acoustical Holography, Vol. 5, (edited by P. J. Green), Plenum Press, NY, 1973.Google Scholar
  6. 6.
    Collins, H. D. and Hildebrand, B. P., Evaluation of Acoustical Holography for the Inspection of Pressure Vessel Sections, book, (Periodic Inspection of Pressure Vessels), Institution of Mechanical Engineers, 1972.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • H. Dale Collins
    • 1
  • Tom E. Hall
    • 1
  • Richard L. Wilson
    • 1
  1. 1.Battelle, Pacific Northwest LaboratoriesRichlandUSA

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