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航天器在空间环境中运行时,会受到质子的辐照,光纤环作为航天器上光纤陀螺的重要组成部件受辐照影响最为严重.为了研究国产“—”字型保偏光纤因质子辐照导致辐照诱导损耗的变化规律及其辐照损伤机理,选择质子能量为5 MeV和10 MeV,,光源波长为1310 nm,原位测量了光纤传输功率变化情况,计算出辐照诱导损耗.利用SRIM软件,模拟能量分别为5 MeV和10 MeV质子辐照在光纤中的电离和位移损伤分布.借助X射线光电子能谱仪分析辐照前后O Is和Si 2p解析谱,借助傅里叶变换红外光谱仪观察光纤辐照前后光谱变化情况研究发现,在波长为1310 nm处,光纤的辐照诱导损耗随着质子注量的增加而增长,主要原因是由于光纤纤芯中Si—OH的浓度增加所导致.而且能量为5 MeV质子辐照造成光纤的辐照诱导损耗比10 MeV严重,这是因为5 MeV质子在光纤纤芯处造成的位移和电离损伤均比10 MeV严重,即产生的Si—OH数量多.
When the spacecraft is operating in a space environment, it will be irradiated by protons, and the optical fiber ring is most seriously affected by irradiation as an important component of a fiber optic gyroscope on a spacecraft. In order to study the effect of proton The variation of irradiation induced loss caused by irradiation and its mechanism of radiation damage were studied. The proton energy was 5 MeV and 10 MeV, the wavelength of light source was 1310 nm, the change of optical fiber transmission power was measured in situ, and the radiation induced loss Using SRIM software, the ionization and displacement damage distributions of 5 MeV and 10 MeV proton irradiation in optical fiber were simulated respectively.The analytic spectra of O Is and Si 2p before and after irradiation were analyzed by X-ray photoelectron spectroscopy Transform infrared spectroscopy before and after the optical fiber to observe changes in the spectrum of the study found that at a wavelength of 1310 nm at the fiber, the radiation induced loss increases with the proton fluence increases, mainly due to the fiber core Si-OH concentration And the energy induced by 5 MeV proton irradiation causes the radiation induced loss of the optical fiber to be more serious than 10 MeV because the displacement and ionization damage caused by the 5 MeV proton at the optical fiber core are both more serious than 10 MeV , Which produces a large number of Si-OH.