激光与光电子学进展, 2018, 55 (2): 020605, 网络出版: 2018-09-10
考虑温度和应变交叉敏感的光纤布拉格光栅测量研究 下载: 1217次
Research on Measurement of Fiber Bragg Grating Considering the Cross-Sensitivity of Temperature and Strain
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
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。
Abstract
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
-6 nm/(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.
丁朋, 董小鹏, 叶肖伟. 考虑温度和应变交叉敏感的光纤布拉格光栅测量研究[J]. 激光与光电子学进展, 2018, 55(2): 020605. Peng Ding, Xiaopeng Dong, Xiaowei Ye. Research on Measurement of Fiber Bragg Grating Considering the Cross-Sensitivity of Temperature and Strain[J]. Laser & Optoelectronics Progress, 2018, 55(2): 020605.