【作者】 陈敏；

【导师】 曲士良；

【作者基本信息】 哈尔滨工业大学 ， 物理学， 2021， 硕士

【摘要】 光纤传感器近年来发展迅速,其中基于空芯光纤的传感结构以其低成本、易制备、快响应、易实现多参数传感的优点,从众多光纤传感结构中脱颖而出。由于空芯光纤存在空气芯和石英侧壁,且基于石英侧壁共振的波长匹配条件对环境变化尤为敏感,因此可以结合空芯光纤结构的多种传感原理实现对于不同环境参数的高灵敏同步探测。本文中,作者将侧壁共振原理与干涉原理结合,提出了基于空芯光纤侧壁共振的透射式和反射式光纤传感结构,分别实现了对温度应变和温度压强的双参数传感应用。具体工作如下:制备了空芯光纤侧壁共振传感结构,从理论和实验上研究了其温度传感特性。对侧壁共振的光强透射光谱进行了模拟仿真,计算了出现侧壁共振现象的空芯光纤临界长度,利用有限元分析法模拟了空芯光纤内的光场分布,理论推导了基于侧壁共振的透射型传感结构的温度灵敏度。实验制备了不同侧壁厚度和长度的透射型空芯光纤传感结构,分析了两结构参数对透射光谱的影响,之后对该结构的温度响应性能进行了实验测试,分析了其传感灵敏度和线性度。提出了一种基于级联空芯光纤内侧壁共振和马赫曾德尔干涉的透射型光纤温度应变同步传感结构。模拟仿真了空芯光纤入射端在不同错位大小条件下的光场分布,分析了错位大小对接收端光场的影响,得到了基于空芯光纤侧壁共振原理传感结构的最佳参数,并对两种原理叠加的透射光谱进行了模拟,理论推导了其温度应变的响应灵敏度。制备了不同长度的空芯光纤传感结构,分析了其对于透射光谱的影响,用滤波法分别提取了马赫曾德尔干涉条纹和侧壁共振条纹,并进行了温度和应变实验测试,可以实现对于温度应变的同步传感探测。提出了一种基于空芯光纤侧壁共振和迈克尔逊干涉的反射型光纤温度压强同步传感结构。对该光纤传感结构接收端反射光谱进行了模拟仿真,理论计算了该光纤传感结构的温度以及压强灵敏度。实验研究了空芯光纤长度和入射端错位大小对反射光谱的影响,并对该传感结构的温度压强灵敏度、传感线性度、响应时间进行了实验测试分析,可以实现高温高压恶劣环境下超快响应的高灵敏温度压强同步传感探测。更多还原

【Abstract】 Optical fiber sensors have developed rapidly in recent years.The hollow core fiber sensing structure possesses advantages such as low cost,easy preparation,fast response and easy realization multi-parameter sensing.The hollow core fiber has air core and quartz sidewall,and the wavelength matching condition based on the quartz sidewall resonance is particularly sensitive to environmental changes,which can achieve highly sensitive and synchronous detection of different environmental parameters.In this paper,the principle of side-wall resonance with the principle of interference,and transmission and reflection fiber sensing structures based on the side-wall resonance mechanism of hollow core fiber have been proposed,realizing the application of dual-parameter sensing for temperature and strain,temperature and pressure respectively.The main work is as follows:The hollow core fiber side-wall resonance sensing structure is fabricated and its temperature sensing characteristics are studied theoretically and experimentally.The transmission spectrum of light intensity of side wall resonance was simulated.The light field distribution in hollow core fiber was simulated by using the finite element analysis method,and the temperature sensitivity of the transmission sensing structure based on side wall resonance was calculated theoretically.Then we tested the temperature response performance of the structure,and analyzed the sensitivity and linearity of the sensor.A novel temperature and strain synchronization sensing structure based on the sidewall resonance in hollow core fiber was proposed.The intensity distributions under the different offset of hollow core fiber has been simulated by using the finite element analysis method.The transmission spectra of two kinds of principle was calculated,and the sensitivity of temperature and strain was simulated.The hollow core fiber sensing structures with different lengths were prepared,and the influence of the hollow fiber sensing structures on the transmission spectrum was analyzed.The sensor could realize the synchronous sensing detection of temperature and strain.A synchronous sensing structure for temperature and pressure based on hollow core fiber side-wall resonance and Michelson interference was proposed.The spectrum of the of the fiber optic sensing structure was simulated,and the temperature and pressure sensitivity of the fiber optic sensing structure are calculated theoretically.We studied the effects of the length of hollow core fiber and the misalignment of the incident end on the reflectance spectrum experimentally,and tested the temperature and pressure sensitivity,sensing linearity and response time of the structure.The structure can realize the synchronous sensing detection of pressure and temperature under high temperature and high pressure environment with high sensitivity and fast response.更多还原