基于偏振串扰分析的分布式光纤温度与应变传感探索研究
发布时间：2018-09-17 12:45
【摘要】：论文对具有广泛应用前景的分布式偏振串扰保偏光纤温度与应变传感技术进行了探索研究,主要围绕保偏光纤串扰延迟差与环境温度数学关系推导、保偏光纤温度传感系数(TSC)测量、分布式温度传感系统设计及可行性验证、保偏光纤串扰强度与横向压力数学关系推导、轴向应变测量传感基带设计、分布式轴向应变传感系统设计及可行性验证等方面展开研究,主要内容和创新点如下:1.对基于偏振串扰分析的分布式光纤温度传感与应变传感进行了理论研究,推导了保偏光纤串扰延迟差与环境温度数学关系式、串扰强度与横向压力数学关系式,并做了模拟分析,得知在一定范围内,应力随串扰量的变化具有近线性的关系;2.通过在保偏光纤上沿轴向不同间隔制造预设串扰峰的方式,实验得到了商用光纤(YOFC PANDA_PM1550_125-18/250)平均的TSC为-0.7μm/(°C?m),且设计了两种分布式温度测量方案,首次验证了基于偏振串扰分析的分布式光纤温度传感的可行性,在不考虑仪器机械误差情况下,系统的测量空间分辨率为1.42m、温度分辨率为1.42℃。3.设计了一种新颖的保偏光纤金属基带制作方案,可把光纤所受的轴向应变有效转换为横向压力进行测量,且搭建了一套简单的应变测量系统,实现了5m光纤长度0~160.888με的高精度分布式应变测量,首次验证了通过布置预设串扰峰的方式实现分布式光纤应变传感的可行性,且系统的空间分辨率可达10cm。
[Abstract]:In this paper, the distributed polarization crosstalk polarization maintaining fiber temperature and strain sensing technology, which has wide application prospect, is studied, and the mathematical relationship between the polarization maintaining fiber crosstalk delay difference and the ambient temperature is derived. (TSC) measurement of temperature sensing coefficient of polarization-maintaining fiber, design and feasibility verification of distributed temperature sensing system, derivation of mathematical relationship between crosstalk intensity and transverse pressure of polarization maintaining fiber, design of sensing baseband for axial strain measurement, The design and feasibility verification of distributed axial strain sensing system are studied. The main contents and innovations are as follows: 1. The distributed optical fiber temperature sensor and strain sensor based on polarization crosstalk analysis are studied theoretically. The mathematical relations between the difference of polarization maintaining fiber crosstalk delay and ambient temperature and the relationship between crosstalk intensity and transverse pressure are derived. The simulation results show that the variation of stress with crosstalk is nearly linear within a certain range. By making preset crosstalk peaks at different axial intervals on polarization-maintaining fibers, the average TSC of commercial optical fiber (YOFC PANDA_PM1550_125-18/250) is -0.7 渭 m / (掳C ~ m), and two distributed temperature measurement schemes are designed. The feasibility of distributed optical fiber temperature sensor based on polarization crosstalk analysis is verified for the first time. The spatial resolution and temperature resolution of the system are 1.42 鈩，
本文编号：2245966
[Abstract]:In this paper, the distributed polarization crosstalk polarization maintaining fiber temperature and strain sensing technology, which has wide application prospect, is studied, and the mathematical relationship between the polarization maintaining fiber crosstalk delay difference and the ambient temperature is derived. (TSC) measurement of temperature sensing coefficient of polarization-maintaining fiber, design and feasibility verification of distributed temperature sensing system, derivation of mathematical relationship between crosstalk intensity and transverse pressure of polarization maintaining fiber, design of sensing baseband for axial strain measurement, The design and feasibility verification of distributed axial strain sensing system are studied. The main contents and innovations are as follows: 1. The distributed optical fiber temperature sensor and strain sensor based on polarization crosstalk analysis are studied theoretically. The mathematical relations between the difference of polarization maintaining fiber crosstalk delay and ambient temperature and the relationship between crosstalk intensity and transverse pressure are derived. The simulation results show that the variation of stress with crosstalk is nearly linear within a certain range. By making preset crosstalk peaks at different axial intervals on polarization-maintaining fibers, the average TSC of commercial optical fiber (YOFC PANDA_PM1550_125-18/250) is -0.7 渭 m / (掳C ~ m), and two distributed temperature measurement schemes are designed. The feasibility of distributed optical fiber temperature sensor based on polarization crosstalk analysis is verified for the first time. The spatial resolution and temperature resolution of the system are 1.42 鈩，
本文编号：2245966
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