| 赵洪霞,程培红,鲍吉龙,苞蕾.一种两段式FBG应变和温度同步测量的实现[J].光电子激光,2014,(6):1071~1074 |
| 一种两段式FBG应变和温度同步测量的实现 |
| Strain and temperature simultaneous measurement using a two-section FBG |
| 投稿时间：2013-10-31 |
| DOI： |
| 中文关键词: 光纤布拉格光栅(FBG) 半腐蚀 纤芯半径 有效折射率 应变 温度 |
| 英文关键词:fiber Bragg grating (FBG) semi-etched core-radius effective refractive index strain temperature |
| 基金项目:国家自然科学基金(61154003)资助项目 (宁波工程学院 电子与信息工程学院,浙江 宁波 315016) |
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| 中文摘要: |
| 为解决光纤布拉格光栅(FBG)的应变和温度交叉 敏感性问题,本文基于FBG纤芯有效折射率与纤芯半 径的良好相关 性,提出一种半腐蚀FBG的新颖结构。即一根FBG被分成等长两部分,用HF酸腐蚀其 1/2区域直到纤芯半径。采用传输矩阵法和纤芯基模有效折射率的色散方程对两段式FBG 建 模,利用Mathcad 15计算软件进行数值仿真和模拟。仿真结果表明, FBG反射峰发生分裂, 即一个反射峰分裂为两个,且当纤芯半径变小时,腐蚀段FBG谐振波长蓝移,而未腐蚀段 FBG谐振波长基本不变；纤芯半径越小,两段FBG谐振波长的间距越大。实验结果表明,实现 了应变和温度的同步测量,得到应变和温度的传感精度分别为7.2μ ε和1．1℃。 |
| 英文摘要: |
| The strain sensing sensitivity of fiber Bragg grating (FBG) is very high,but it is necessary to solve the temperature cross-sensitive problem effectively in practical applicat ions.Based on the relationship of the core effective refractive index of the FBG and the core radi us,a new type FBG sensor composed of two sections is proposed.An FBG is divided into two sections with e qual length.One of them is eroded using HF acid.So the two sections can be regar ded as two FBGs with different resonant wavelengths.Spectral characteristics of this in-series FBG and analyzed using the dispersion equation of two-layer dielectric fiber and the transfer matrix metho d.The simulation results show that the resonant band is split due to the particularity of the FBG structu re.As the core radius reduces,the resonant wavelength of the etched section of FBG presents a b lue shift,while the resonant wavelength of the other section of FBG remain basi cally unchanged,the distance between two resonant wavelengths is increased with the decrease of the core radius.At the s ame time,strain and temperature are measured,and the sensitivities of strain and temperature sensing are 7.2με and 1.1℃,respectively. |
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