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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。
Double-clad large core UV quartz fiber has high transmission efficiency and radiation resistance, and has good application prospect in nuclear radiation field signal transmission and measurement. However, in the nuclear radiation field, the irradiation of optical fiber will produce light and induced loss, affecting the measurement accuracy and accuracy. For this purpose, a system and method for measuring optical radiation loss and luminescence spectra of optical fibers were established. The optical fibers with 0.2, 0.4 and 0.6 mm core diameter were irradiated on a steady-state 60 Co gamma ray source with an irradiation dose rate of 0.053 6 Gy / s The measurement. The experimental results show that the larger the core diameter is, the smaller the additional loss caused by optical fiber irradiation is; the additional irradiation loss is not proportional to the total dose, and the increment of the loss gradually decreases with the increase of the irradiation time and the total dose; And the loss is related to the wavelength of the light. The emission intensity and loss of the short-wavelength fiber are larger than those of the longer wavelength. The luminescence spectra of the 0.6mm fiber at 300-600nm are obtained. The luminescence intensity is about 10 ~ (-13) W · s / Gy · m). In the same time, different wavelength radiation recovery effect is different, the long wavelength loss is small, and the fiber transmission efficiency is quickly restored to the pre-irradiation, while the short wavelength loss is large and recovery is slow.