摘要
把光纤布拉格光栅(FBG)的有效折射率、周期用二元函数泰勒展开,理论验证FBG温度-应变和应变-温度交叉敏感方式相同,得出热光系数和弹光系数均与有效折射率平方成正比例关系的结论;列出温度、应变测量计算方程式,并阐述了计算方法。测试温度、应变同时存在时FBG的波长,可知温度-应变和应变-温度交叉灵敏度系数分别为-1.4743×10^(-6)nm/(℃·με)、-1.3948×10^(-6)nm/(με·℃)。把FBG静力水准仪放置于露天阳台上监测一天内波长变化,代入方程式计算,得到较为精确的水准仪液体深度变化解。结果表明,使用温度、应变计算方程式求解,能够提高FBG的测量精度。
We get the binary Taylor expansions of the effective refractive index and period of fiber Bragg grating （FBG）, verify theoretically that the temperature-strain and strain-temperature cross sensitivities are the same, and make a conclusion that the thermo-optical coefficient and the elasto-optical coefficient are both proportional to the square of the effective refractive index. The calculation equations of temperature and strain are listed, and the method of calculation is expatiated. The wavelengths of FBG under different temperatures and strains are measured, and the cross sensitivity coefficients of temperature-strain and strain-temperature are -1. 4743 × 10^-6 nm/（℃·με） and -1. 3948 ×10^-6nm/（με·℃）. We place the FBG hydrostatic leveling instrument on the open-air balcony for one day, monitor the wavelength changes of FBG, and then calculate and get a more accurate solution to the changes of liquid depth in the hydrostatic level instrument. The experimental results show that using the calculation equations of temperature and strain can improve the measurement accuracy of FBG.
作者
丁朋
董小鹏
叶肖伟
Ding Peng;Dong Xiaopeng;Ye Xiaowei(73089 PLA Troops, Xuzhou, Jiangsu 221000, China;Institute of Light-Wave Technology, Schoot of Information Science and Engineering, Xiamen University, Xiamen, Fujian 361005, Chin;College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China)
出处
《激光与光电子学进展》
CSCD
北大核心
2018年第2期136-140,共5页
Laser & Optoelectronics Progress
关键词
光纤光学
光纤布拉格光栅
交叉灵敏度系数
热光系数
弹光系数
fiber optics
fiber Bragg grating
cross-sensitivity coefficient
thermo-optical coefficient
elasto-optical coefficient
