基于非均匀采样的光纤光栅解调系统

发布时间：2018-07-04 15:36

本文选题：光纤光栅解调 + 非均匀采样　；参考：《中北大学》2014年硕士论文

【摘要】：光纤布拉格光栅传感器凭借着光纤特有的高绝缘性、耐腐蚀性、强抗电磁干扰性以及稳定的化学特性,能够在高温、高湿、高压、强噪声、强腐蚀性等复杂条件中稳定工作,并能够结合光纤遥感、遥测技术,形成光纤遥感系统和光纤遥测系统,而在传感领域内相对于传统的电传感器有着绝对的优势。光通信科技的蓬勃发展和光栅写入技术的不断进步使光纤光栅传感器也迎来了巨大的发展契机。本文主要介绍了一种基于非均匀采样的光纤光栅解调系统,提出了利用扫描周期随机变化的正弦波来实现传感光纤光栅的非等间隔采样,极大地拓宽了光纤传感装置的测量带宽,同时也满足了传感器对于测量高精度的追求,完善了基于可调谐F-P滤波器重叠多光栅传感装置由多光栅的引入导致的数据混叠问题,提高传感光纤光栅的应用范围和灵活性,满足了光纤传感解调装置对于测量精度和宽度的同时需求。本文在对光纤光栅解调原理进行深入了解的基础上,对现有的光纤光栅解调技术进行了研究和对比,确定基于可调谐F-P滤波器的光纤光栅解调方案,并详细分析影响基于可调谐F-P滤波器的光纤光栅解调系统性能指标的因素；掌握光栅解调系统各部分元器件的工作原理和性能参数,分析光纤光栅传感系统的传感原理和解调方式,设计硬件电路,搭建基于非均匀采样的光纤光栅解调系统测试平台；重点研究了非均匀采样的实现方法,介绍非均匀采样算法的解算原理,分别从模拟实验角度和系统实际方向对非均匀采样算法的抗混叠特性做了验证,结果证实非均匀采样算法能够以低于尼奎斯特采样频率的采样率对待测信号进行采样分析,能够在频域上完整地还原原始信号而不产生失真和混叠现象,以及将非均匀采样和重叠双光栅传感解调系统相融合,提高系统各项性能指标。
[Abstract]:Fiber Prague grating sensor is able to work steadily in complex conditions such as high temperature, high humidity, high pressure, strong noise and strong corrosion by virtue of its unique high insulation, corrosion resistance, strong resistance to electromagnetic interference and stable chemical properties, and can combine fiber remote sensing and telemetry to form optical fiber remote sensing system and optical fiber telemetry system. In the field of sensing, it has an absolute advantage over the traditional electric sensors. The rapid development of optical communication technology and the continuous progress of grating writing technology make the fiber grating sensor have a great opportunity to develop.
In this paper, a fiber Bragg grating demodulation system based on non uniform sampling is introduced. The non equal interval sampling of sensing fiber Bragg grating is realized by the sine wave of random change of scanning period, which greatly widens the measurement bandwidth of the optical fiber sensing device, and also satisfies the pursuit of high precision of the sensor and perfect the base. The data aliasing caused by the introduction of multiple gratings is caused by the multi grating sensing device of tunable F-P filter, which improves the application range and flexibility of the sensing fiber Bragg grating, and satisfies the demand for the measurement accuracy and width of the optical fiber sensing demodulation device.
Based on the thorough understanding of the principle of fiber Bragg grating demodulation, this paper studies and compares the existing fiber grating demodulation technology, determines the fiber grating demodulation scheme based on the tunable F-P filter, and analyzes the factors affecting the performance index of the optical fiber grating demodulation system based on the tunable F-P filter, and master the light. The work principle and performance parameters of all parts of the grating demodulation system, analyze the sensing principle and demodulation mode of the fiber Bragg grating sensing system, design the hardware circuit, build the testing platform of the fiber Bragg grating demodulation system based on non uniform sampling, focus on the non uniform sampling method, and introduce the solution of the non-uniform sampling algorithm. We verify the anti aliasing characteristics of the non uniform sampling algorithm from the simulation experiment angle and the system actual direction. The result proves that the non-uniform sampling algorithm can treat the measured signal with the sampling rate below the nquist sampling frequency, and can completely restore the original signal in the frequency domain without producing distortion and aliasing. Phenomenon, and the integration of non-uniform sampling and overlapped double grating sensing demodulation system to improve the performance indicators of the system.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP212

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