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    A new multi-spectral radiation method accurately measures unknown target temperature and emissivity without prior data. This approach significantly reduces calculation errors, offering practical solutions for material analysis.

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    Area of Science:

    • Physics
    • Thermodynamics
    • Optical Engineering

    Background:

    • Multi-spectral radiation thermometry is a non-contact method for temperature and emissivity measurement.
    • Underdetermined equation systems pose a core challenge, limiting accuracy for unknown targets.
    • Existing methods require emissivity prior knowledge or accurate initial conditions, hindering broad application.

    Purpose of the Study:

    • To develop a novel method for non-contact temperature and emissivity measurement of unknown targets.
    • To overcome limitations of existing numerical and functional emissivity methods.
    • To provide a universally applicable and high-precision solution for underdetermined systems in radiation thermometry.

    Main Methods:

    • Proposed a moving emissivity retardation spectral window method.
    • Utilized the Lagrange mean value theorem to define an emissivity retardation interval.
    • Established universal and high-precision constraint conditions for solving the underdetermined system.

    Main Results:

    • Simulation experiments demonstrated reduced average temperature errors by 31.0% and emissivity errors by 30.7% compared to the moving narrowband window method.
    • Blackbody experiments yielded a temperature error of approximately 0.4 K and emissivity measurements between 0.993-0.999.
    • The method requires no prior emissivity knowledge or initial conditions.

    Conclusions:

    • The moving emissivity retardation spectral window method offers a significant advancement in radiation thermometry.
    • The technique provides accurate measurements for unknown targets, meeting practical needs across various substances.
    • This method enhances the reliability and applicability of non-contact temperature and emissivity determination.