TRW Acousto-Optical Nonimmersion Flaw-Imaging System

  • R. A. Smith
  • N. H. Doshi
  • R. L. Johnson
  • P. G. Bhuta

Abstract

Several investigators1, 2, 3 have described techniques and experiments where objects in media opaque to light have been made visible by Bragg diffraction of light due to ultrasound scattered from the object viewed. These authors immersed the object viewed in water to aid the conduction of scattered sound into a light/sound interaction region. More recent published work also concerned immersed obj ects.4, 5 The work reported here extends previous results to formation of images of nonimmersed solid objects which require access from only one side. This is accomplished by using pulsed sound reflected from discontinuities within a test object composed of solid material. Nonimmersion is accomplished by transmitting and receiving sound through a membrane separating water in the light/sound interaction region from the test object.

Keywords

Dust Polyethylene Rubber Beach Sine 

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References

  1. 1.
    A. Korpel, “Visualization of the Cross-Section of a Sound Beam by Bragg Diffraction of Light,” Appl. Phys. Letters , 9:425 (1966) .ADSCrossRefGoogle Scholar
  2. 2.
    G. Wade, C. J. Landry and A. A. de Souze, Acoustical Transparencies for Optical Imaging and Ultrasonic Diffraction, Acoustical Holography, Vol. I, Metherell, El-Sum and Larmore, Editors , Plenum Press (1969) , pp. 159–172 .CrossRefGoogle Scholar
  3. 3.
    J. Landry, J. Powers and G. Wade, “Ultrasonic Imaging of Internal Structure by Bragg Diffraction,” Appl. Phys . Letters, 15 , (15 September 1969) , pp. 186–188.ADSCrossRefGoogle Scholar
  4. 4.
    R. Aprahamian and P. G. Bhuta, “NDT by Acousto-Optical Imaging,” Materials Evaluation ASNT, Vol. XXIX, No. 5, (May 1971) , pp. 112–116.Google Scholar
  5. 5.
    R. A. Smith, G. Wade, J. Powers and J. Landry, “Studies of Resolution in a Bragg Imaging System,” J. Acoust. Soc. Am., Vol. 49, No. 3 (part 3) (1971) , pp. 1062–1068.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • R. A. Smith
    • 1
  • N. H. Doshi
    • 1
  • R. L. Johnson
    • 1
  • P. G. Bhuta
    • 1
  1. 1.One Space ParkTRW Systems GroupRedondo BeachUSA

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