Mr. Yizhuo Zhang Profile

Yizhuo Zhang

at Nanjing Univ

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Proceedings Article | 17 May 2019 Paper

Investigation on the radiation recovery effect on BOTDR system

Yizhuo Zhang, Mi Li, Zhang Chen, Xuping Zhang

Proceedings Volume 11170, 111703I (2019) https://doi.org/10.1117/12.2533918

KEYWORDS: Radiation effects, Signal attenuation, Optical fibers, Optical sensing, Gamma radiation, Sensing systems, Reflectometry, Aerospace engineering, Environmental sensing, Color centers

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Brillouin Optical Time Domain Reflectometer (BOTDR), as a distributed optical fiber sensing technique, has been widely used in health monitoring of large structures on the ground in recent years. Space engineers also have a strong interest in it. However, in space environment, the optical performance of sensing fibers in BOTDR will decrease due to space radiation. Usually, the ground simulation space radiation experiment only considers the influence of radiation damage on optical properties of optical fibers. However, the performance variation of optical fibers after radiation is a combined result of radiation damage and self-recovery. If the restoring characteristic is introduced into the radiation damage model, the accuracy of BOTDR radiation assessment will be greatly improved. To study the radiation recovery characteristics of BOTDR, a 1 km single-mode G.652.D YOFC fiber is used as the sensing optical fiber of BOTDR, and is placed in the radiation field of Co 60 to receive 200Gy gamma radiation with 1.42 Gy/min dose rate. After the radiation procedure, the radiation recovery characteristics of BOTDR were monitored for 1506 hours. The experimental results show that the radiation recovery effect has little effect on Brillouin frequency shift and stress coefficient, but the attenuation coefficient of optical fiber caused by radiation can be restored obviously in the first 100 hours. The attenuation coefficient of optical fiber recovers from 3.5 dB/km to 1.5 dB/km. The above results are of great significance to modify the radiation model of BOTDR in space radiation environment.

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