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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Synthetic aperture rainbow refractometry.

Xinhao Wang, Yingchun Wu, Dongyan Xu

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    |October 14, 2022
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    Summary
    This summary is machine-generated.

    Synthetic aperture rainbow refractometry (SARR) enhances long-distance droplet analysis by combining dual-wavelength rainbow signals. This novel method accurately measures droplet size and refractive index, enabling industrial applications.

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    Area of Science:

    • Optical Physics
    • Fluid Dynamics
    • Metrology

    Background:

    • Rainbow refractometry traditionally faces limitations in measurement distance and droplet size.
    • Existing methods struggle with long-range analysis of small droplets.

    Purpose of the Study:

    • To introduce Synthetic Aperture Rainbow Refractometry (SARR) for enhanced long-distance and small droplet measurements.
    • To develop an achromatic imaging system and data processing algorithm for SARR.

    Main Methods:

    • Synthesizing rainbow signals from the same droplet using dual-wavelength laser beams.
    • Employing an achromatic imaging system to separate and record dual rainbow signals.
    • Developing a data processing algorithm to retrieve droplet refractive index and size.

    Main Results:

    • Numerical simulations validated SARR for droplet sizes from 10 μm to 200 μm.
    • Proof-of-concept experiments with ethanol droplets at 1650 mm achieved high accuracy.
    • Measured uncertainties were 2.3 × 10⁻⁴ for refractive index and 2 μm for size.

    Conclusions:

    • SARR demonstrates feasibility and accuracy for precise droplet characterization.
    • The developed technique expands the applicability of rainbow refractometry to industrial scales.