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光纤Bragg光栅压力传感机理研究
引用本文:李智忠,杨华勇,刘阳,周伟林,胡永明.光纤Bragg光栅压力传感机理研究[J].应用光学,2005,26(3):16-19.
作者姓名:李智忠  杨华勇  刘阳  周伟林  胡永明
作者单位:国防科技大学,理学院,湖南,长沙,410073
基金项目:国家自然科学基金资助项目(编号:60377029)
摘    要:对光纤Bragg光栅的压力传感机理进行了理论研究。分析了引起光纤光栅中心波长偏移的各种物理效应,并对几种不同形式压力下各种物理效应所引起的灵敏度系数进行了计算。计算结果表明,纵向和横向压力灵敏度系数相反,屏蔽一个方向可获得较大的压力传感灵敏度;波导效应所引起的应变灵敏度系数都比弹光效应小几个数量级,因此可以忽略。并首次提出在不同方向的压力作用下,弹光效应对应变灵敏度具有不同的贡献。

关 键 词:光纤Bragg光栅  压力传感  机理
文章编号:1002-2082(2005)03-0016-04
收稿时间:2004/2/5

Research on the Pressure Sensing Mechanism of Fiber Bragg Grating
LI Zhi-zhong,YANG Hua-yong,LIU Yang,ZHOU Wei-lin,HU Yong-ming.Research on the Pressure Sensing Mechanism of Fiber Bragg Grating[J].Journal of Applied Optics,2005,26(3):16-19.
Authors:LI Zhi-zhong  YANG Hua-yong  LIU Yang  ZHOU Wei-lin  HU Yong-ming
Institution:College of Science,National University of Defense Technology, Changsha 410073,China
Abstract:The pressure sensing mechanism of fiber Bragg grating has been researched. Various physical effects that induce the center wavelength of the fiber Bragg grating to shift are discussed and the sensitivity coefficients of different physical effects under different types of pressure are calculated. The calculation results show that the pressure sensing coefficients under the axial and the transverse pressures are opposite in sign, and the pressure sensitivity can be increased through shielding either of them. The strain sensitivity induced by the waveguide effect is several orders of magnitude smaller than that induced by the strain-optic effect, so it can be neglected. The conclusion that the strain-optic effect has different contributes to the stress sensitivity under pressure in different directions is also drawn for the first time.
Keywords:fiber Bragg grating  pressure sensing  mechanism
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