Distributed optical fiber has been increasingly used in dam (dike) seepage monitoring, but its application is restricted by long heating time and low efficiency. First, the technical requirements of distributed fiber optic cable with heating function are expounded in this paper. Then the quantitative relationship between heating time and other factors, including heating-conductor length, cross-sectional area and resistance, are analyzed. In overall consideration of the material, flexibility, tensile strength, resistivity, optical fiber structure, and insulation of the heating conductor, a special distributed fiber optic cable with heating function was customized with lowest cost and was applied to the leakage monitoring for the first stage project of middle route South-to-North water transfer. The results showed that the customized distributed fiber optic cable meets the heating-requirements, demonstrating good market prospect.
Key words
distributed optical fiber /
heating /
nickel-chromium alloy /
fiber structure /
South-to-North water transfer
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 蔡德所.分布式光纤传感监测技术研究[J].广西水利水电,2001,(1):11-14.(CAI De-suo. Study on the Distributed Fiber Sensing Monitor Technique[J]. Guangxi Water Resources Hydropower Engeneering,2001, (1): 11-14.(in Chinese))
[2] 徐卫军,侯建国,李端有.分布式光纤测温系统在景洪电站大坝混凝土温度监测中的应用研究[J].水力发电学报,2007,(1):97-101.(XU Wei-jun, HOU Jian-guo, LI Duan-you. Application Research on Temperature Monitoring in Concrete of Jinghong Hydropower Station by Distributed Optical Fiber Temperature Measurement System[J]. Journal of Hydroelectric Engineering,2007,(1):97-101.(in Chinese))
[3] 李端有,熊 健,於三大, 等.土石坝渗流热监测技术研究[J].长江科学院院报,2005,(6):29-33.(LI Duan-you, XIONG Jian, YU Shan-da, et al. Study on Seepage Monitoring Technology with Temperature in Embankment Dam[J]. Journal of Yangtze River Scientific Research Institute,2005,(6):29-33.(in Chinese))
[4] 傅立叶.热的解析理论[M]. 桂质亮,译. 北京:北京大学出版社,2008.(FOURIER.Analytical Theory of Heat[M].Translated by GUI Zhi-liang. Beijing: Beijing University Press,2008.(in Chinese))
PDF(1260 KB)
