双包层紫外光纤伽马辐照效应实验研究  

Irradiation-induced Effect Measurement in Double-clad Large Core Pure Quartz Fiber on ^(60)Co Source

作　　者：张美[1,2] 王培伟[1] 李奎念 赵吉祯[1] 李阳[1] 袁媛[1] 盛亮[1] 胡华四[2] 丁楠 马燕[1] 

机构地区：[1]西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室,陕西西安710024 [2]西安交通大学能源与动力工程学院,陕西西安710049 [3]中国电子集团第八研究所,安徽合肥230059

出　　处：《原子能科学技术》2017年第3期536-542,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11275155)

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。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.

关 键 词：双包层大芯径紫外石英光纤 辐照损耗 辐致诱导发光 

分 类 号：O43[机械工程—光学工程]