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    Area of Science:

    • Opto-mechanical engineering
    • Radiometry
    • Metrology

    Background:

    • Accurate thermodynamic temperature determination is crucial for high-temperature applications.
    • Existing methods may have limitations in precision or applicability to blackbody radiation.

    Purpose of the Study:

    • To present the opto-mechanical design of a novel filter radiometer.
    • To detail the design considerations for accurate thermodynamic temperature measurement of blackbodies.

    Main Methods:

    • Design of a three-element reflection-type trap detector utilizing silicon photodiodes.
    • Integration of a detachable narrow-band filter for spectral coverage.
    • Implementation of a diamond-turned precision aperture for field of view definition.
    • Temperature stabilization via water-streamed housing and measurement with a platinum thermometer.

    Main Results:

    • The filter radiometer design incorporates a compact trap mount and large active area photodiodes.
    • This configuration enables a wide field of view for the instrument.
    • The design facilitates accurate thermodynamic temperature determination.

    Conclusions:

    • The developed filter radiometer is suitable for accurate thermodynamic temperature measurements of high-temperature blackbodies.
    • The opto-mechanical design choices support the intended application requirements.