Journal of Applied Optics, Volume. 44, Issue 3, 580(2023)

Measurement of normal spectral emissivity of materials at high temperature

Liang YUAN1...2,*, Lin'guang YUAN2, Zaitian DONG2, Yan LI2, Jihong FAN2, Fei LU2, Juncheng ZHAO2, Deng ZHANG2 and Yue YOU2 |Show fewer author(s)
Author Affiliations
  • 1School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 2The First Scale Optical Metrology Station of the Science, Technology and Industry for National Defense, Xi'an Institute of Applied Optics, Xi'an 710065, China
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    In order to meet the high-precision measurement requirements of spectral emissivity of high-temperature material coating, including stealthy materials, thermal protection materials, heat insulating coat and so on, the measuring methods for normal spectral emissivity of materials at 1 273 K~3 100 K was explored. A measurement model of normal spectral emissivity of materials was established based on the emissivity definition. On this basis, the measurement facility of normal spectral emissivity of materials was built, and the wavelength range was 0.7 μm to 12 μm. In order to overcome the technical difficulties associated with cavity effect when the sample was heated with high precision in the measuring device, a sample heating furnace with a movable graphite crucible was developed, and the good experimental results were obtained. The normal spectral emissivity of two samples (SiC and low emissivity coating) was measured by this facility. The results show that the normal spectral emissivity of two samples reduces with the increase of wavelengths and rises with the increase of temperature. Finally, the measurement uncertainty of normal spectral emissivity of materials at high temperature was analyzed, and the relative expanded uncertainty is 3.6%.

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    Liang YUAN, Lin'guang YUAN, Zaitian DONG, Yan LI, Jihong FAN, Fei LU, Juncheng ZHAO, Deng ZHANG, Yue YOU. Measurement of normal spectral emissivity of materials at high temperature[J]. Journal of Applied Optics, 2023, 44(3): 580

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    Paper Information

    Category: Research Articles

    Received: May. 16, 2022

    Accepted: --

    Published Online: Jun. 19, 2023

    The Author Email:

    DOI:10.5768/JAO202344.0303002

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