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Effect of radiation-induced color centers absorption in optical fibers on fiber optic gyroscope for space application

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Chinese Physics B 2016年第8期25卷 216-221页

作者：金靖李亚张祖琛吴春晓宋凝芳 School of Instrument Science and Optic-electronics Engineering Beihang University

The effects of color centers＇ absorption on fibers and interferometric fiber optical gyroscopes（IFOGs） are studied in the paper. The irradiation induced attenuation（RIA） spectra of three types of polarization-maintaining fibers（PMFs）, i.e.,P-doped, Ge-doped, and pure silica, irradiated at 100 Gy and 1000 Gy are measured in a wavelength range from 1100 nm to1600 nm and decomposed according to the Gaussian model. The relationship of the color centers absorption intensity with radiation dose is investigated based on a power model. Furthermore, the effects of all color centers＇ absorption on RIA and mean wavelength shifts（MWS） at 1300 nm and 1550 nm are discussed respectively. Finally, the random walk coefficient（RWC） degradation induced from RIA and the scale factor error induced by MWS of the IFOG are simulated and tested at a wavelength of 1300 nm. This research will contribute to the applications of the fibers in radiation environments.

关键词： color centers' absorption radiation-induced attenuation mean wavelength shift fiber optical gyroscope

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Reliability modeling of the bivariate deteriorating product with both monotonic and non-monotonic degradation paths

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Journal of Systems Engineering and Electronics 2021年第4期32卷 971-983页

作者： SUN Fuqiang GUO Hongxuan LIU Jingcheng School of Reliability and Systems Engineering Beihang UniversityBeijing 100191China Science and Technology on Reliability and Environmental Engineering Laboratory Beihang UniversityBeijing 100191China Wuhan Maritime Communication Research Institute Wuhan 430079China

fiber optical gyroscope(FOG)is a highly reliable navigation element,and the degradation trajectories of its two accuracy indexes are monotonic and non-monotonic *** this paper,a flexible accelerated degradation testing(ADT)model is used for analyzing the bivariate dependent degradation process of *** time-varying copulas are employed to consider the dynamic dependency structure between two marginal degradation processes as the Wiener process and the inverse Gaussian *** statistical inference is implemented by utilizing an inference function for the margins(IFM)*** is demonstrated that the proposed method is powerful in modeling the joint distribution with various margins.

关键词： fiber optical gyroscope bivariate accelerated degradation testing Wiener process inverse Gaussian process time-varying copulas dependence

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