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Light-guide snapshot imaging spectrometer for remote sensing applications.

Ye Wang, Michal E Pawlowski, Shuna Cheng

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    This study introduces a novel fiber-based snapshot imaging spectrometer for detailed spectral and spatial analysis. The system demonstrates effective hyperspectral imaging of distant scenes, offering versatile applications in environmental monitoring and resource management.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Imaging Technology

    Background:

    • Hyperspectral imaging systems are crucial for detailed scene analysis.
    • Existing systems often face limitations in spatial-spectral resolution and portability.
    • A need exists for advanced imaging spectrometers capable of capturing distant scenes with high fidelity.

    Purpose of the Study:

    • To develop and characterize a novel fiber-based snapshot imaging spectrometer.
    • To demonstrate its capability for high-resolution hyperspectral imaging of terrestrial environments and dynamic events.
    • To explore its potential applications in various scientific and monitoring fields.

    Main Methods:

    • A custom-fabricated fiber bundle with multicore fiber ribbons was designed for spatial sampling and spectral dispersion.
    • Two core selection methods, lenslet array and photomask, were employed to prevent spectral overlap.
    • A phase-shifting interferometry (PSI)-based method was developed for rapid spatial calibration of over 30,000 spatial samples.

    Main Results:

    • The developed spectrometer achieved a maximum of 31853 spatial samples and 61 spectral channels (450nm-750nm).
    • Preliminary hyperspectral imaging of a campus landscape and Houston traffic demonstrated successful distant scene and snapshot imaging capabilities.
    • Spectral measurements of plant species correlated well with reference instrument data, validating system accuracy.

    Conclusions:

    • The fiber-based snapshot imaging spectrometer offers a promising platform for advanced hyperspectral analysis.
    • The system's design allows tunable spatial and spectral sampling for diverse applications.
    • Potential applications include terrestrial monitoring, land use analysis, pollution studies, water resource management, and lightning spectroscopy.