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Photoacoustic Depth Profiling of Continuously Inhomogeneous Condensed Phases and Application to the Liquid Crystal Octylcyanobiphenyl (8 CB)

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Photoacoustic and Photothermal Phenomena III

Part of the book series: Springer Series in Optical Sciences ((SSOS,volume 69))

Abstract

An application is presented of the Hamilton-Jacobi formulation of thermal-wave physics [A. Mandelis, J. Math. Phys. 26, 2676 (1985)] to the problem of photoacoustic depth profiling of inhomogeneous condensed phases with arbitrary, continuously varying thermal diffusivity profiles, which exhibits excellent profile reconstruction fidelity. The method was used to obtain quantitative depth profiles of thermal diffusivity decreases extending 20–30 μm below the surface of the liquid crystal 8 CB, as a result of observed changes in the photoacoustic signal frequency response upon the application of a transverse magnetic field in the nematic phase at 37°C. These decreasing profiles are a measure of the extent of bulk reorientational effects due to the magnetic field, as well as the extent of the influence of the surface as a domain reorientation inhibitor.

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Authors and Affiliations

  1. Photoacoustic and Photothermal Sciences Laboratory and Ontario Laser and Lightwave Research Center, Department of Mechanical Engineering, University of Toronto, Toronto, Canada, M5S 1A4

    A. Mandelis & S. B. Peralta

  2. Department of Physics, Laboratorium voor Akoestiek en Warmtegeleiding, K.U. Leuven, B-3001, Leuven, Belgium

    E. Schoubs & J. Thoen

Authors
  1. A. Mandelis
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  2. E. Schoubs
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  3. S. B. Peralta
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  4. J. Thoen
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Editor information

Editors and Affiliations

  1. Laser Photoacoustic Laboratory, Department of Agricultural Engineering and Physics, Wageningen Agricultural University, Bomenweg 4, 6703 HD, Wageningen, The Netherlands

    Dane Bićanić

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© 1992 Springer-Verlag Berlin Heidelberg

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Mandelis, A., Schoubs, E., Peralta, S.B., Thoen, J. (1992). Photoacoustic Depth Profiling of Continuously Inhomogeneous Condensed Phases and Application to the Liquid Crystal Octylcyanobiphenyl (8 CB). In: Bićanić, D. (eds) Photoacoustic and Photothermal Phenomena III. Springer Series in Optical Sciences, vol 69. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-47269-8_46

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  • DOI: https://doi.org/10.1007/978-3-540-47269-8_46

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-13876-2

  • Online ISBN: 978-3-540-47269-8

  • eBook Packages: Springer Book Archive

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