分布式光纤越来越多地应用于土石坝(堤)渗流监测中，但光纤的加热时间长、效率低，制约了分布式光纤的应用。首先阐述了加热型分布式光纤光缆的技术要求，研究了加热导体长度、截面面积、电阻与加热时间的定量关系，然后综合考虑加热导体的选材、柔韧性、抗拉强度、电阻率、光纤结构、绝缘等，在尽可能降低成本的基础上提出了相应的解决办法，定制出特种加热型分布式光纤光缆，并将其应用于南水北调中线一期工程渗漏监测中。结果表明，经过定制的加热型分布式光纤光缆能够满足光纤加热的要求，具有较好的市场应用前景。
Abstract
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.
关键词
分布式光纤 /
加热 /
镍铬合金 /
光纤结构 /
南水北调
Key words
distributed optical fiber /
heating /
nickel-chromium alloy /
fiber structure /
South-to-North water transfer
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参考文献
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[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))
基金
“十二五”国家科技支撑项目(2011BA10OB00)；水利部948项目(201123)
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