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分析了聚合物光纤在辐照环境下的物理化学变化,实验研究了聚甲基丙烯酸甲脂(PMMA)光纤在不同剂量的γ射线辐照下的辐照损伤和恢复特性,测量了PMMA光纤在可见光波段的辐照光谱和恢复光谱以及在638nm的辐照前后透过率及辐照损伤.测量结果表明,光纤的辐照损伤和恢复都有波长相关性,辐照剂量低于5kGy,PMMA光纤在整个可见光波段的辐照损伤情况差别不大,辐照剂量超过5kGy,PMMA光纤在400nm～550nm波段的辐照损伤比600nm～800nm的辐照损伤要严重.
The physicochemical changes of polymer optical fiber under irradiation environment were analyzed. The damage and recovery characteristics of polymethylmethacrylate (PMMA) fiber irradiated by different doses of γ-ray were experimentally studied. The visible spectrum of the radiation spectrum and recovery spectra and the 638nm before and after irradiation and radiation damage.The results show that the radiation damage and recovery of optical fiber has a wavelength dependence of the irradiation dose is less than 5kGy PMMA fiber The radiation damage in the whole visible light band is not much different. When the radiation dose exceeds 5kGy, the radiation damage of PMMA fiber in 400nm ~ 550nm band is more serious than the radiation damage of 600nm ~ 800nm.