In order to develop the application of fiber Bragg grating in the measurement of temperature and strain in space environment,it is necessary to study the performance of fiber Bragg grating in space radiation envi-ronment. Based on the color center model,the influence of ionizing radiation on the transmission performance of fi-ber Bragg grating is analyzed theoretically. A 60Co-γ radiation source was used to study the ionization radiation ex-periment with a total dose of 1.01 × 106rad for two Ge-doped single-mode fiber Bragg gratings with center wave-lengths of 825 nm and 835 nm. The experimental results show that with the increase of irradiation dose, the peak wavelength of fiber Bragg grating reflector redshift phenomenon,the grating refractive index increases. After the to-tal dose of 1.01 × 106rad irradiation,the peak wavelengths of the Bragg center wavelengths of 825 nm and 835 nm were increased by 0.070 62 nm and 0.074 15 nm,respectively. The experimental results are in agreement with the relationship between the effective refractive index of the grating and the radiation dose. The experimental results provide a data basis for the application of fiber Bragg gratings in space ambient temperature and strain measure-ment.%为开发光纤布拉格光栅在空间环境温度及应变的测量的应用,有必要对其在空间辐射环境下的性能变化规律进行研究.基于色心模型,从理论上分析了电离辐射对光纤布拉格光栅传输性能的影响.采用60Co-γ辐射源对两根布拉格中心波长分别为825 nm和835 nm的掺锗单模光纤布拉格光栅进行了总剂量为1.01×106rad的电离辐射实验.实验结果表明,随着辐照剂量的增加,光纤布拉格光栅反射谱的峰值波长发生了红移现象,光栅的折射率增加.经过总剂量1.01×106rad辐照后,布拉格中心波长825 nm和835 nm的峰值波长分别增加了0.07062 nm和0.07415 nm.实验结果与色心模型推导出的光栅有效折射率与辐射剂量的函数关系式相符合;为光纤布拉格光栅在空间环境温度及应变测量的运用提供数据基础.
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