保偏光纤模间干涉折射率传感特性研究

发布时间：2018-03-25 08:55

本文选题：保偏光纤　切入点：模间干涉　出处：《燕山大学》2016年硕士论文

【摘要】：随着光纤传感器的大量使用,光纤折射率传感器在工程领域得到广泛地应用。保偏光纤作为一种特种光纤,凭借双折射效应高、保偏性能好、低衰减等优点,被广泛应用在光纤陀螺、光纤温度、应力、弯曲等传感器和DWDM、EDFA等光纤通信系统。近年来,保偏光纤在光纤传感器领域的应用也逐渐得到科研人员的重视,基于保偏光纤的微结构光纤光栅、双芯光子晶体光纤等传感器都有广泛的应用。本文提出了一种基于保偏光纤模间干涉原理的折射率传感器方案并开展了深入的理论与实验研究工作,主要研究内容有:首先,用有限元分析法分别从理论上对双空气孔保偏光子晶体光纤和椭圆芯保偏光纤的模传输特性和模间干涉原理进行了理论分析,明确了双模产生条件、模间干涉模场分布等基本特性;其次,对拉锥型双空气孔光子晶体保偏光纤和腐蚀型椭圆芯保偏光纤的折射率传感特性进行了仿真分析,建立了在不同液体折射率情况下模间干涉的响应特性数学模型;然后,根据仿真结果建立了模间干涉实验系统,专门对腐蚀处理的椭圆芯保偏光纤的模间干涉特性进行研究,开展了灵敏度响应的折射率传感实验研究;最后,通过实验研究对传感器的折射率响应范围、响应灵敏度及线性度等传感器关键问题进行了数据分析和整理,给出了详细的研究结论。本课题提出的基于保偏光纤模间干涉原理折射率传感方案能够用更简单的光强测量方式实现传感信号的解调,具有结构简单、解调成本低等优点,对于推进光纤折射率传感器的研究具有良好的理论意义和实际应用价值。
[Abstract]:With the extensive use of optical fiber sensors, optical fiber refractive index sensors have been widely used in the field of engineering. As a special fiber, polarization maintaining fiber has the advantages of high birefringence, good polarization maintaining performance, low attenuation and so on. It has been widely used in fiber optic gyroscope, fiber temperature, stress, bending and other optical fiber communication systems such as DWDMN EDFA. In recent years, the application of polarization maintaining fiber in the field of optical fiber sensors has been paid more and more attention by researchers. Microstructured Fiber Bragg gratings based on Polarization-maintaining Fiber, Two core photonic crystal fiber sensors have been widely used. In this paper, a refractive index sensor based on the principle of polarization maintaining fiber intermodal interference is proposed, and the theoretical and experimental work is carried out. The main research contents are as follows: first of all, In this paper, the mode propagation characteristics and the intermodal interference principle of double air hole polarization maintaining photonic crystal fiber and elliptical core polarization maintaining fiber are theoretically analyzed by finite element analysis, and the conditions of double mode generation are determined. Secondly, the refractive index sensing characteristics of tapered double-air photonic crystal polarization-maintaining fiber and corrosion-type elliptical core polarization maintaining fiber are simulated and analyzed. A mathematical model of the response characteristics of intermodal interference under different refractive index of liquids is established, and then, according to the simulation results, an experimental system of intermodal interference is established to study the intermodal interference characteristics of elliptical core polarization-maintaining fiber treated by corrosion. Finally, the key problems of the sensor, such as the range of refractive index response, the sensitivity of the sensor and the linearity of the sensor, are analyzed and sorted out. In this paper, the refractive index sensing scheme based on the principle of interference between modes of polarization maintaining fiber can be used to demodulate the sensing signal by a simpler light intensity measurement method, which has the advantages of simple structure and low demodulation cost. It has good theoretical significance and practical application value for advancing the research of optical fiber refractive index sensor.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN253

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