基于掺铒光纤激光器的光纤光栅振动传感系统研究
发布时间：2018-09-02 09:48
【摘要】：近些年来,光纤光栅振动传感器在电力设备和民用工程结构健康状况在线诊断、故障点定位等领域具有广阔的应用前景。其中,基于掺铒光纤激光器的光纤光栅振动传感器因其优良的传感性能成为研究的主要方向。本文首先介绍了光纤光栅激光传感器的基本结构、分类和研究现状以及其在振动传感方面的研究进展,并对光纤光栅激光传感器的原理、掺铒光纤激光器的基本原理、光纤光栅的应变、温度、振动传感检测原理及其解调技术进行理论研究,提出了一种采用双边缘滤波法解调振动信号的基于掺铒光纤激光器的光纤光栅振动传感系统,并分析了系统的特性;利用Opti System仿真了掺铒光纤激光器的输出特性,对影响激光器输出功率的参数进行了优化,得到了输出耦合器的最佳分光比和掺铒光纤的最佳长度;改变光纤光栅的中心波长,仿真研究了振动解调系统输出功率与传感光栅的中心波长的关系,结果表明二者在一定传感范围内呈线性关系,确定了系统的可行性;搭建了采用边缘滤波法的基于掺铒光纤激光器的光纤光栅振动传感系统,使用悬臂梁式光纤光栅传感器提供振动信号,通过改变掺铒光纤长度得到其在15 m处激光器有较大的输出,实现了10 Hz、20 Hz、30 Hz低频振动信号的检测。
[Abstract]:In recent years, fiber Bragg grating vibration sensors have been widely used in the field of on-line diagnosis and fault location of power equipment and civil engineering structures. Among them, fiber grating vibration sensor based on erbium-doped fiber laser has become the main research direction because of its excellent sensing performance. In this paper, the basic structure, classification and research status of fiber grating laser sensor and its research progress in vibration sensing are introduced, and the principle of fiber grating laser sensor and the basic principle of erbium-doped fiber laser are discussed. The strain, temperature, vibration sensing principle and demodulation technology of fiber Bragg grating (FBG) are studied theoretically. A fiber Bragg grating (FBG) vibration sensing system based on erbium-doped fiber laser is proposed, which demodulates the vibration signal by double edge filtering method. The output characteristics of erbium-doped fiber laser are simulated by Opti System, the parameters affecting the output power of the laser are optimized, and the optimum splitting ratio of output coupler and the optimum length of erbium-doped fiber are obtained. The relationship between the output power of the vibration demodulation system and the central wavelength of the sensing grating is simulated and studied by changing the central wavelength of the fiber grating. The results show that the relationship between the output power and the central wavelength of the sensor grating is linear in a certain range, and the feasibility of the system is determined. A fiber Bragg grating vibration sensing system based on erbium-doped fiber laser using edge filtering method is built. The cantilever fiber grating sensor is used to provide vibration signal. By changing the length of erbium-doped fiber, the laser output at 15m is obtained, and the detection of 10 Hz,20 Hz,30 Hz low frequency vibration signal is realized.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248;TP212
本文编号：2218990
[Abstract]:In recent years, fiber Bragg grating vibration sensors have been widely used in the field of on-line diagnosis and fault location of power equipment and civil engineering structures. Among them, fiber grating vibration sensor based on erbium-doped fiber laser has become the main research direction because of its excellent sensing performance. In this paper, the basic structure, classification and research status of fiber grating laser sensor and its research progress in vibration sensing are introduced, and the principle of fiber grating laser sensor and the basic principle of erbium-doped fiber laser are discussed. The strain, temperature, vibration sensing principle and demodulation technology of fiber Bragg grating (FBG) are studied theoretically. A fiber Bragg grating (FBG) vibration sensing system based on erbium-doped fiber laser is proposed, which demodulates the vibration signal by double edge filtering method. The output characteristics of erbium-doped fiber laser are simulated by Opti System, the parameters affecting the output power of the laser are optimized, and the optimum splitting ratio of output coupler and the optimum length of erbium-doped fiber are obtained. The relationship between the output power of the vibration demodulation system and the central wavelength of the sensing grating is simulated and studied by changing the central wavelength of the fiber grating. The results show that the relationship between the output power and the central wavelength of the sensor grating is linear in a certain range, and the feasibility of the system is determined. A fiber Bragg grating vibration sensing system based on erbium-doped fiber laser using edge filtering method is built. The cantilever fiber grating sensor is used to provide vibration signal. By changing the length of erbium-doped fiber, the laser output at 15m is obtained, and the detection of 10 Hz,20 Hz,30 Hz low frequency vibration signal is realized.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248;TP212
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