Efficient Acoustical Holography and Phase Imaging with High Resolution at 3.6 MHz Using a Liquid Crystal Convertor

  • Jean-Luc Dion
Part of the Acoustical Imaging book series (ACIM, volume 15)


For some time, the field of acoustical holography at megahertz frequencies has suffered a decline due to various causes such as complexity of implementation, excessive computation times, artifacts due to coherence, etc. Overall, the lack of fast and relatively simple means of conversion of the acoustical hologram into a visible image has been a decisive factor. As we know, three main field detection and recording techniques have evolved in the last twenty years or so:
  1. a)

    One- or two-dimensional scanning with a transducer or a transducer array.1–3

  2. b)

    Levitation of a liquid surface. 4–6

  3. c)

    Nematic liquid crystal convertor. 7–12



Liquid Crystal Nematic Liquid Crystal Liquid Crystal Cell Object Wave Ultrasonic Field 
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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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Jean-Luc Dion
    • 1
  1. 1.Laboratoire d’Électronique industrielle, Département d’IngénierieUniversité du Québec à Trois-RivièresTrois-RivièresCanada

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