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介绍了γ射线对光纤的辐射效应,开展了稳态、瞬态γ辐射对光纤的感生损耗测量实验。计算了光纤在高剂量率脉冲γ辐射作用下的电子密度、电子与中性原子的碰撞频率、等离子体振荡频率,提出了基于低温等离子体对光波吸收的瞬态辐射感生损耗模型,计算了光纤在600～1600 nm的瞬态辐射感生损耗并与实验测量结果进行了对比分析。结果表明:(1)在1310 nm和1550 nm波长,光纤的瞬态辐射感生损耗的计算结果与实验测量结果在相同数量级,实验测量结果验证了等离子体吸收模型的适用性;(2)脉冲γ射线作用于光纤时,等离子体吸收与原子缺陷吸收同时存在,光纤的瞬态辐射感生损耗是两种机制共同作用的结果;(3)在600～1600 nm光谱范围内,随探测波长的增大,光纤的辐射感生损耗以等离子体吸收为主。
The radiation effects of γ-ray on optical fiber are introduced, and experiments on the induced loss of optical fiber by steady-state and transient γ-radiation are carried out. The electron density, the collision frequency between electrons and neutral atoms and the plasma oscillation frequency under the high dose rate pulsed γ radiation were calculated. The transient radiation induced loss model based on the low-temperature plasma absorption of light was proposed. Induced Losses of Optical Fiber at 600 ~ 1600 nm Transient Radiation and Comparative Analysis with Experimental Measurement Results. The results show that: (1) At 1310 nm and 1550 nm, the calculation results of the induced loss of the transient radiation of optical fiber are on the same order of magnitude as the experimental measurements. The experimental results verify the applicability of the plasma absorption model. (2) When γ ray acts on the optical fiber, the plasma absorption and the atomic defect absorption exist at the same time, and the transient radiation induced loss of the optical fiber is the result of the mutual action of the two mechanisms. (3) In the 600-1600 nm spectral range, Increase, the radiation induced loss of the optical fiber is mainly absorbed by the plasma.