光学学报, 2013, 33 (9): 0906001, 网络出版: 2013-08-27   

基于光纤光栅法布里珀罗干涉仪的液体介质声波检测技术研究

Acoustic Detection Technology Based on Fiber Bragg Grating Fabry-Perot Interferometer in Liquid Medium
作者单位
1 哈尔滨理工大学电气与电子工程学院工程电介质及应用技术教育部重点实验室, 黑龙江 哈尔滨 150080
2 南方电网科学研究院有限责任公司, 广东 广州 510000
摘要
结合光纤光栅法布里珀罗干涉仪(FBG-FPI)和圆筒振子耦合技术设计高灵敏度传感器,应用于电力设备液体绝缘介质中声波信号检测。FBG-FPI采用反射率为50%的光纤布拉格光栅(FBG),中间处截断熔接20 mm长单模光纤SMF-28制备。为获得高灵敏度,根据弹性力学原理和有限元分析方法建立圆筒振子参数确定方法。为解决FBG-FPI受温度影响而造成静态工作点漂移的问题,提出了一种利用可调谐分布式反馈(DFB)激光器的温度补偿方法,并通过升降温实验验证了该方法的温度补偿效果。建立FBG-FPI传感器与RC6500T传感器对比实验系统,实验结果表明在1.1 kHz声波信号驱动下液体介质中的FBG-FPI与加速度传感器具有相近灵敏度。
Abstract
Combining with fiber Bragg grating Fabry-Perot interferometer (FBG-FPI) with cylinder oscillator coupling technology, a highly sensitive sensor is designed for detecting acoustic signal in liquid dielectrics of electrical equipment. A fiber Bragg gratting (FBG) with reflectivity of 50% is cut in the middle to produce two identical half-length Bragg gratings, and a piece of 20-mm SMF-28 monomode fiber is spliced between the FBGs to produce the FBG-FPI. The parameters of the cylinder oscillator are determined for high sensitivity by finite element analysis method based on the theory of elasticity. A novel method of temperature compensation using a tunable distributed feedback (DFB) laser is presented to solve FBG-FPI static working point drift influenced by temperature change. The effect of temperature compensation is proved by raising and falling temperature experiment. A contrast system with FBG-FPI sensor and RC6500T transducer is designed and constructed. The experimental results show that FBG-FPI in liquid dielectrics has the same sensitivity as acceleration transducer for the 1.1 kHz acoustic signal.

张伟超, 赵洪, 刘通, 王国利, 李锐海. 基于光纤光栅法布里珀罗干涉仪的液体介质声波检测技术研究[J]. 光学学报, 2013, 33(9): 0906001. Zhang Weichao, Zhao Hong, Liu Tong, Wang Guoli, Li Ruihai. Acoustic Detection Technology Based on Fiber Bragg Grating Fabry-Perot Interferometer in Liquid Medium[J]. Acta Optica Sinica, 2013, 33(9): 0906001.

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