环境温度宽范围变化对光纤布里渊频移的影响

• 作 者: 赵丽娟
• 机 构: 华北电力大学生物质发电成套设备国家工程实验室,
• 出 处: 物理学报
• 发表日期: 2010年09期
• 关键词: 布里渊频移 布里渊散射 环境温度 高温传感 测量系统 温度点 瑞利散射光 传感技术 BOTDR 理论分析

搭建了光纤布里渊频移测量系统,实现了色散位移光纤20℃到820℃布里渊频移的测量,并对测量数据进行拟合.在环境温度大范围变化时,目前采用的布里渊频移-温度一阶线性关系式对测量数据分析误差较大,针对这个问题,本文从纯石英光纤的结构特点和材料的物性系数出发,在分析光纤的热膨胀系数、光纤密度、折射率、弹性模量和泊松比与宽范围温度关系的基础上,根据布里渊频移与各物性参数的关系式理论推导了宽范围温度变化与布里渊频移之间的二次项关系式.理论推导结果与实验数据基本符合,验证了理论分析的正确性,从而为光纤宽范围布里渊温度传感奠定了基础.

A fiber Brillouin frequency shift measurement system was set up to measure the Brillouin frequency shift from 20 ° C to 820 ° C for dispersion-shifted fibers and to fit the measured data.When the ambient temperature changes widely, The first order linear relationship of deep frequency shift and temperature has great error in the measurement data analysis. According to the structural characteristics of the pure silica fiber and the physical properties of the material, this paper analyzes the thermal expansion coefficient, optical fiber density, refractive index, Based on the relationship between Brillouin frequency shift and various physical parameters, the quadratic relationship between temperature and Brillouin frequency shift is deduced. The theoretical derivation results are in good agreement with the experimental data, which verifies the correctness of the theoretical analysis and lays the foundation for a wide range of fiber Brillouin temperature sensing.