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Effect of electron exposure on optical properties of aluminized polyimide film

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摘要

The effect of the irradiation of electrons with 10-70 keV on optical properties, including spectral reflectance rho and solar absorptance a_s, of aluminized polyimide films was investigated. The spectral reflectance was measured in situ before and after electron exposure. Experimental results showed that the reflective properties of aluminized polyimide film were apparently degraded in the 500-1200 nm wavelength range of the solar spectrum. Under the exposure of electrons, no charging effects were found on the aluminized polyimide film serving as an ion-conductive polymer. After the exposure, an "annealing" or "bleaching" effect occurred. At a given irradiation fluence, the change in solar absorptance (DELTA a_s) of the aluminized polyimide film was increased with electron energy. There is a threshold value of electron flux phi_(cr) which affects the change in DELTA a_s of the aluminized polyimide film, approximately phi_(cr) = 6 X 10~(12) electrons/cm~2s. When phi phi_(cr), DELTA a_s increases with the flux monotonically. The change in DELTA a_s with electron fluence PHI can be expressed in the form of a power function: DELTA a_s = alpha PHI~(beta). The factors alpha and beta are related to electron energy and show a maximum and a minimum value at 50 keV, respectively.

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  • 来源
    《Journal of Materials Research》 |2002年第9期|2442-2446|共5页
  • 作者

    Chundong Li; Dezhuang Yang; Shiyu He;

  • 作者单位

    Space Materials & Environment Engineering Laboratory, Harbin Institute of Technology, Harbin 150001, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 工程材料学;
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