【作者】 张信普；

【导师】 彭伟；

【作者基本信息】 大连理工大学 ， 光学工程， 2012， 硕士

【摘要】 光纤光栅传感器越来越引起人们的关注,利用光纤光栅可以对温度、弯曲、压力、应变、加速度及折射率等参量进行测量,而且光纤光栅可以很好的实现准分布式测量。根据对当前折射率测量及光纤折射率传感器研究和应用的调研,我们设计和制作了一种结构简单的折射率传感器并且在实验上证明了这种结构可以进行环境折射率的测量。本论文在对光纤光栅的发展、分类及特点和应用进行文献调研的基础上,研究了光纤布拉格光栅的结构及工作原理；对光纤光栅的制作技术进行了比较分析,并采用193nmArF准分子激光器作为写入光源,采用相位掩模法制作了光纤布拉格光栅；通过对光纤光栅用于传感测量的原理进行了理论分析和仿真模拟,获得了不同的光纤模式对外界折射率不同的敏感程度,并给出了随外界折射率变化传感器输出信号的变化规律；利用Rsoft软件进行了不同模式对外界折射率的不同响应的模拟分析,设计了基于光纤偏芯与光纤布拉格光栅相结合的传感结构,并实现和制作了该种光纤折射率传感器；通过将所研制的传感器用于折射率测量的实验测试和结果分析,验证了该类传感器对于折射率测量的可行性。本论文的理论和实验研究证明,采用包层模式泄漏的方式可以有效地实现折射率的测量,而且模式对外界折射率的敏感程度随着模式阶数增加。在未来的工作中,我们将逐步设计和实现阶数可控的传感器结构进行该类传感器优化和灵敏度提高。更多还原

【Abstract】 Fiber Bragg grating (FBG) sensors have generated great interests base on their unique advantages such as small structures, strong anti-jamming abilities, multiplexing capabilities. Currently, FBG sensors have been widely used for temperature, bending, strain, acceleration, and refractive index measurement as well as quasi-distributed measurement. According to the research of study and application of current refractive index and the optical fiber sensor, in this paper we design and develop a refractive index sensor structure. The sensor is fabricated and demonstrated for refractive index monitoring in experiment.This paper is based on the literature research of the development of fiber Bragg grating, classification, features and application; then the structure and principle of FBG is introduced in detail. Finally, the technology about fabrication of FBG is introduced in detail. The FBG is fabricated by using phase mask method, while193nm ArF excimer laser is used as a photo writing source. Through the theory analysis and simulation of fiber grating sensor, we know that there are different sensitive degree to external refractive index with different order modes, and receive the regular pattern of sensor output signal changes VS refractive index changes; Sensitivities of various optical wave modes are obtained by the Rsoft software. The proposed sensor approach by concatenating an FBG and a core-offset structure is a highly promising and simplified method for a wide range of refractive index sensing applications.; we demonstrated that this sensor is an effectively structure to measure refractive index though the result of this paper. Theory and experiment of this paper shows that using Leak modes is an effectively way to measure refractive index, and sensitive degree to external refractive index increase by mode order increased. In the future work, we will optimize and improve sensitivity of this sensor through gradually design the controllable order sensor structure.更多还原