中国激光, 2010, 37 (6): 1525, 网络出版: 2010-07-07   

强度解调型光纤光栅法布里珀罗干涉仪的应变传感灵敏度分析

Sensitivity Analysis on Strain Sensor Based on Fabry-Perot Interferometer with Intensity Interrogation
作者单位
西北工业大学理学院,陕西省光信息技术重点实验室,教育部空间应用物理与化学重点实验室, 陕西 西安 710072
摘要
根据强度解调型光纤光栅法布里珀罗干涉仪(FBG-FPI)的应变传感原理,分析讨论了其光栅栅长、折射率调制深度、干涉仪腔长以及与换能器的结合方式等因素对传感器最大应变灵敏度的影响;同时对比分析了强度解调型FBG-FPI与单个光纤布拉格光栅(FBG)以及传统光纤法布里珀罗干涉仪的应变传感灵敏度差异。结果表明,强度解调型FBG-FPI应变传感器的理论可探测最小应变量达10-12量级。利用FBG-FPI粘贴压电陶瓷(PZT)提供的微小周期性应变实验证明,强度解调型FBG-FPI应变传感器具有对微弱交变应变信号的探测能力,并且在进行非线性修正后,该应变传感器还具有良好的线性响应特性。
Abstract
Based on the principle of intensity interrogation, the sensitivity of the fiber Bragg grating Fabry-Perot interferometer (FBG-FPI) strain sensor is analyzed and the influences of the grating length, the effective refractive index change and the cavity length of FBG-FPI resonator on the maximum strain sensitivity are also discussed. The strain sensitivities of two structures which FBG-FPI fibers are affixed to the transducer by different ways are also considered. The comparison between FBG-FPI and single fiber Bragg grating as well as traditional fiber Fabry-Perot interferometer with intensity interrogation is also presented. It is shown that the minimum theoretically detectable strain of the FBG-FPI strain sensors with intensity interrogation should be on the order of 10-12. The corresponding experiments, in which a periodic strain stimulated by a piezoelectric (PZT) affixed to the FBG-FPI, show that such a FBG-FPI strain sensor can be used to detect weak alternating strain signal and it has good linear character after the non-linear correction.

樊帆, 赵建林, 文喜星, 姜碧强. 强度解调型光纤光栅法布里珀罗干涉仪的应变传感灵敏度分析[J]. 中国激光, 2010, 37(6): 1525. Fan Fan, Zhao Jianlin, Wen Xixing, Jiang Biqiang. Sensitivity Analysis on Strain Sensor Based on Fabry-Perot Interferometer with Intensity Interrogation[J]. Chinese Journal of Lasers, 2010, 37(6): 1525.

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