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Related Experiment Video

Updated: Jun 14, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Amplitude-modulated reticle constructed by a liquid crystal cell array.

Y Itakura, A Sugimura, S Tsutsumi

    Applied Optics
    |March 25, 2010
    PubMed
    Summary
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    A novel liquid crystal (LC) amplitude-modulated (AM) reticle enables remote sensing of flow velocity. This spatiotemporal filter accurately measured river flow vectors in a feasibility test.

    Area of Science:

    • Optoelectronics
    • Remote Sensing
    • Fluid Dynamics

    Background:

    • Traditional flow velocity sensors struggle with unpredictable speed and direction variations.
    • Amplitude-modulated (AM) reticles offer potential for flow measurement but require advancement.
    • Liquid crystal (LC) technology provides tunable optical properties suitable for advanced sensor design.

    Purpose of the Study:

    • To develop and test a new type of AM reticle using a liquid crystal (LC) cell array.
    • To assess the feasibility of this LC-AM reticle for measuring flow velocity vectors in real-world conditions.

    Main Methods:

    • Constructed a novel amplitude-modulated reticle utilizing a liquid crystal cell array.
    • Employed optoelectronic control to achieve spatiotemporal filtering via LC dynamic scattering.

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  • Conducted a feasibility test using a pair of LC-AM reticles to measure a river's flow-velocity vector.

    • Main Results:

    • The developed LC-AM reticle functions as an effective spatiotemporal spatial filter.
    • The sensor system successfully measured the flow-velocity vector of a river.
    • Demonstrated the potential for measuring flow with unpredictable variations in speed and direction.

    Conclusions:

    • The liquid crystal amplitude-modulated reticle is a viable technology for flow velocity remote sensing.
    • This approach offers a promising solution for environments with complex and variable flow dynamics.
    • Further development could lead to robust sensors for diverse fluid dynamics applications.