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Volume 41 Issue 7
Jul.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(7): 1269-1274.
WANG Yahui, WANG Qiang, ZHANG Bochuan, et al. Measurement method for thermal radiation characteristics of IR window materials[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1269-1274. doi: 10.13700/j.bh.1001-5965.2014.0553(in Chinese)
Citation: WANG Yahui, WANG Qiang, ZHANG Bochuan, et al. Measurement method for thermal radiation characteristics of IR window materials[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1269-1274. doi: 10.13700/j.bh.1001-5965.2014.0553(in Chinese)
shu

Measurement method for thermal radiation characteristics of IR window materials

doi: 10.13700/j.bh.1001-5965.2014.0553
  • 1.

    School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • 2. Beijing Aerospace Automatic Control Institute, Beijing 100854, China

  • 3. National Key Laboratory of Science and Technology on Aerospace Intelligent Control, Beijing 100854, China

  • Received Date: 10 Sep 2014
  • Rev Recd Date: 22 Dec 2014
  • Publish Date: 20 Jul 2015
    Abstract
  • When a hypersonic vehicle is flying in the atmosphere, serious aero-thermo-radiation effects can reduce or even destroy the performance of infrared (IR) detection, and high-temperature IR window becomes the main factor of the effects due to the aerodynamic heating. Based on thermal radiation transfer model for IR window, a method was proposed to measure thermal radiation characteristics of IR window materials. And thermal radiation characteristics of a sapphire IR window material applied to mid-wave infrared (MWIR) detection system were measured. The results indicate that thermal radiation characteristics of the sapphire IR window material with thickness of 0.1mm, in the wavelength region 3.7-4.8μm, have an approximate cubic relationship with temperature, changing from 100℃ to 350℃. With the rise of temperature, the transmittance decreases, while the self-radiation increases. The intensive self-radiation can make detector into saturation state easily, of which the influence on the MWIR detection system is bigger than that of transmittance which decreases detecting signal to noise ratio (SNR).

     

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