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IR Spectrometers01:25

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Global optimization radiometric calibration method for an infrared system with a wide dynamic range.

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    This study introduces a global optimization radiometric calibration method to overcome limitations of traditional approaches. The new technique simplifies calibration, improves measurement precision, and accurately measures internal stray radiation in infrared systems.

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    Area of Science:

    • Optics and Photonics
    • Infrared Technology
    • Radiometry

    Background:

    • Conventional radiometric calibration methods face challenges including complex procedures, limited dynamic range, and poor correlation in calibration data.
    • These limitations hinder accurate measurements, especially in infrared systems with fluctuating radiation levels.

    Purpose of the Study:

    • To propose a novel global optimization radiometric calibration method that addresses the shortcomings of conventional techniques.
    • To enhance measurement precision and simplify the calibration process for infrared systems.

    Main Methods:

    • A unified database was created by integrating diverse gray-level images, neutral density attenuators, integration times, and target radiations based on an infrared physical model.
    • Calibration coefficients were automatically learned using a relative error backward propagation network.
    • The method was experimentally validated on a large-aperture ground-based infrared system.

    Main Results:

    • The proposed method effectively handles learning imbalance caused by significant fluctuations in infrared radiation.
    • It ensures global measurement precision through a simplified calibration procedure.
    • Accurate measurement of internal stray radiation within the optical system was achieved.

    Conclusions:

    • The developed global optimization radiometric calibration method offers a superior alternative to conventional techniques.
    • It provides a more robust, precise, and simpler approach for infrared system calibration.
    • The method demonstrates significant potential for advancing infrared measurement accuracy and system diagnostics.