Pseudo-Holographic Acoustical Imaging with a Liquid Crystal Convertor

  • J. L. Dion
  • A. LeBlanc
  • A. D. Jacob
Part of the Acoustical Imaging book series (ACIM, volume 10)

Abstract

A new acoustical holography technique is presented, based on the acousto-optical conversion properties of a specially designed nematic liquid crystal cell. In particular conditions, an ultrasonic hologram can be “written” on a thin L.C. layer as a spatial modulation of the molecular orientation. Direct and real-time conversion to a visible hologram or image of the object can be achieved by means of incoherent light. The system has inherent intensity or phase imaging properties. Application to interferential acoustical holography is also considered. The images presented show that the theoretical limit of resolution can be practically achieved at frequencies of a few megahertz.

Keywords

Liquid Crystal Nematic Liquid Crystal Holographic Interferometry Object Wave Visible Fringe 
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]
    JEAN-LUC DION, “Un nouvel effet des ultrasons sur l’orientation d’un cristal liquide”, C.R. Acad. Sc. Paris, t. 284, série B (1977), 219–222.Google Scholar
  2. [2]
    J.L. DION, “Anisotropie ultrasonore et réorientation moléculaire dans un nématique: nouvelle confirmation”, C.R. Acad. Sc. Paris, t. 286, série B (1978), 383–385.Google Scholar
  3. [3]
    J.L. DION and A.D. JACOB, “A new hypothesis on ultrasonic interaction with a nematic liquid crystal”, Appl. Phys. Lett., 31 (1977), 490–493.ADSCrossRefGoogle Scholar
  4. [4]
    JEAN-LUC DION, “The orienting action of ultrasound on liquid crystals related to the theorem of minimum entropy production” J. Appl. Phys., 50 (1979), 2965–2966.ADSCrossRefGoogle Scholar
  5. [5]
    J.L. DION, R. SIMARD, A.D. JACOB and A. LEBLANC, “The acoustooptical effect in liquid crystals due to anisotropic attenuation: new developments and applications”, IEEE Ultrasonics Symposium Proc., sept. 1979, IEEE cat. No. CH1482–9/79, p. 56–60.Google Scholar
  6. [6]
    O.A. KAPUSTINA and V.N. LUPANOV, “Experimental investigation of a liquid crystal acousto-optical image convertor”, Soviet Phys. Acoust. vol. 23, No. 3 (1977), 218–221.Google Scholar
  7. [7]
    S. LETCHER, J. LEBRUN and S. CANDAU, “Acousto-optic effect in nematic liquid crystals”, J. Acoust. Soc. Am., vol. 63, No. 1 (1978), 55–59.Google Scholar
  8. [8]
    H.G. BRUCHMULLER, “Die Flüssigkristallzelle als akustooptischer Wandler”, Acustica, v. 40 (1978), 155–166.Google Scholar
  9. [9]
    A.E. LORD Jr. and M.M. LABES, “Anisotropic ultrasonic properties of a nematic liquid crystal”, Phys. Rev. Lett., v. 25 (1970).Google Scholar
  10. [10]
    F. JAHNIG, “Dispersion and absorption of sound in nematic”, Z. Physik, v. 258 (1973), 199–208.ADSCrossRefGoogle Scholar
  11. [11]
    P. GREGUSS, “A new liquid crystal acoustical-to-optical display”, Acustica, vol. 29 (1973), 52–58.Google Scholar
  12. [12]
    M.D. FOX, W.F. RANSON, J.R. GRIFFIN and R.H. PETTEY, “Theory of Acoustic holographic interferometry”, in Acoustical Holography, vol. 5,( Plenum Press, New York, 1974 ).Google Scholar
  13. [13]
    K. SUZUKI and B.P. HILDEBRAND, “Holographic interferometry with acoustic waves”, in Acoustical Holography, vol. 6, ( Plenum Press, New York, 1975 ).Google Scholar
  14. [14]
    J. PASTEUR and Y. SEIZERIAT, “Holographie acoustique; application au traitement optique de l’information acoustique”, Optica Acta, 24 (1977), 859–875.ADSCrossRefGoogle Scholar
  15. [15]
    B.B. BRENDEN and G.L. FITZGERALD, “Acoustical Holography and Imaging” in Acoustical Imaging and Holography, 1 (1978), 1–48.Google Scholar

Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • J. L. Dion
    • 1
  • A. LeBlanc
    • 1
  • A. D. Jacob
    • 1
  1. 1.Département d’IngénierieUniversité du Québec à Trois-RivièresTrois-RivièresCanada

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