光学与光电技术, 2019, 17 (6): 33, 网络出版: 2020-01-07
基于划分温度区段的分布式光纤传感应变监测温度补偿方法
Temperature Compensation Based on Dividing the Ambient Temperature in Distributed Fiber Optical Strain Sensing
分布式光纤应变传感 布里渊频移 温度补偿 划分温度区段 布里渊光时域分析仪 distributed fiber optical strain sensing Brillouin frequency shift temperature compensation temperature domain diving BOTDA(Brillouin optical time-domain analysis)
摘要
针对分布式光纤应变传感中温度补偿问题,通过温度补偿光缆测得只与环境温度相关的布里渊频移。划分温度区段,对每一单独温度区段内的应变光缆的布里渊频移进行分析。基于在温度相同的不同时段,应变光缆的布里渊频移变化量只与应变相关的原理,构造出划分温度区段的温度补偿方法,在每个温度区段温度变化很小,基本不引起布里渊频移发生变化,可以独立分析应变,并给出了计算流程图。通过工程实例展示了该方法能在较大的温度变化范围内有效地进行温度补偿,实现温度和应变在测量中的解耦,准确测量应变。
Abstract
In view of the distributed fiber optical strain sensing,the problem of temperature compensation is difficult to solve. By using Brillouin frequency shift of the temperature compensation optical cable,the ambient temperature could be got. To divide the ambient temperature into several small temperature domain,the Brillouin frequency shift of the strain optical cable only relates to its strain. The method of temperature compensation based on dividing the ambient temperature is constructed. In each temperature interval,Brillouin frequency shift is disconnected with the temperature. The strain can independently be got from Brillouin frequency shift. The detailed process flow diagram is presented. In the application,the method of temperature compensation is valid in the situation of significant promoting temperature. This approach decouples the temperature and the strain in Brillouin frequency shift,and the strain can be accurately monitored.
胡威, 唐博晓, 陈岗, 黄伟雄, 杨玺, 孙国富. 基于划分温度区段的分布式光纤传感应变监测温度补偿方法[J]. 光学与光电技术, 2019, 17(6): 33. HUWei, TANG Xiao-bo, CHEN Gang, HUANGWei-xiong, YANG Xi, SUN Guo-fu. Temperature Compensation Based on Dividing the Ambient Temperature in Distributed Fiber Optical Strain Sensing[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2019, 17(6): 33.