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[Research on Small-Type and High-Spectral-Resolution Grating Monochromator].

Zeng-peng Yang, Yu-guo Tang, Bayanheshig

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
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    A new small, high-spectral-resolution grating monochromator was designed for calibrating hyperspectral imaging spectrometers. This instrument achieves excellent spectral resolution and wavelength precision for improved spectral imaging applications.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Instrument Design

    Context:

    • Hyperspectral imaging spectrometers require continuous spectral calibration for accurate data acquisition.
    • Existing calibration equipment can be bulky or lack the necessary spectral resolution.
    • A compact and high-performance solution is needed for field or space-constrained applications.

    Purpose:

    • To design a small-type, high-spectral-resolution grating monochromator for continuous calibration of hyperspectral imaging spectrometers.
    • To detail the design process, including grating selection, focal length calculation, and slit sizing.
    • To develop a method for evaluating wavelength repeatability and precision.

    Summary:

    • A horizontal Czerny-Turner grating monochromator was designed, prioritizing high spectral resolution and compact size.
    • Key structural parameters were determined, and their impact on spectral resolution and volume was analyzed.
    • Mechanical components were optimized for a small and portable instrument, including slit, lens, and scanning mechanisms.
    • Wavelength calibration was performed using a mercury lamp, and a method for assessing wavelength accuracy was established.
    • Experimental results demonstrate a spectral resolution better than 0.1 nm and high wavelength precision (±0.0969 nm) in the 400-800 nm range.

    Impact:

    • Enables precise and continuous spectral calibration of hyperspectral imaging spectrometers.
    • Facilitates the development of smaller, more portable spectral imaging systems.
    • Improves the accuracy and reliability of hyperspectral data for various scientific and industrial applications.
    • Provides a validated method for assessing the performance of spectral calibration instruments.