中文摘要：

双包层大芯径紫外石英光纤具有高的传输效率和耐辐照性,在核辐射场信号传输与测量中有良好的应用前景。但在核辐射场中,光纤受辐照会产生发光和诱导损耗,影响测量精度和准确度。为此,建立了光纤辐照损耗和发光光谱测量系统及方法,对芯径为0.2、0.4和0.6mm石英光纤在辐照剂量率为0.053 6Gy/s的稳态60 Co伽马射线源上进行了测量。实验结果表明：芯径越大,光纤辐照产生的附加损耗越小;辐照附加损耗并非与总剂量呈正比,随着辐照时间和总剂量的增加,损耗值增量逐渐减小;发光和损耗与光的波长有关,短波区光纤发光强度和损耗较长波区大;实验测量得到了0.6mm光纤在300-600nm的发光光谱,发光强度约为10-13 W·s/（Gy·m）;相同时间内,不同波长辐照恢复效果不同,长波长损耗小,较快恢复到辐照前光纤传输效率,而短波长损耗大,恢复较慢。

英文摘要：

The large core pure quartz fiber with double-clad offers an attractive alterna- tive to transmit light pulse signal in irradiation fields. But fibers can be induced to produce luminescence and absorption by irradiation, and this makes the real signal dete- riorated. In order to evaluate these effects, the fibers of core diameters of 0.2, 0.4 and 0.6 mm were researched in 60Co source with irradiation dosage rate of 0. 053 6 Gy/s. The experimental results show that the irradiation induced loss decreases with core diameter increasing; the additional loss is not in direct proportion to the amount of totaldosage with total dosage increasing, the additional loss increases slowly and gradually reaches stable value; the amounts of illumination and loss at short wavelength are more than those at long wavelength in 300-600 nm wavelength, and luminous intensity is 10 13 W · s/（Gy · m）. In addition, the recovery of these fibers is observed.