基于最小二乘法的电力电缆FBG传感测温系统  

Fiber Bragg Grating Temperature Sensing System of Power Cables Based on Least Square Method

作　　者：杨广学[1] 莫磊[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150040

出　　处：《光电技术应用》2009年第6期39-42,共4页Electro-Optic Technology Application

摘　　要：为了提高电力电缆测温系统的测量精度和速度,提出了以光纤梳状滤波器代替参考光栅提供拟合数据参考点,采用最小二乘法拟合光纤Bragg光栅波长和F-P可调谐滤波器调谐电压的线性关系,通过F-P可调谐滤波器解调FBG传感器中心波长变化的方法,完成对电力电缆温度的测量.研究表明,光纤梳状滤波器能够代替多个恒温参考光栅实现波长标定,对反射波长的测量误差<5 pm,温度均方误差≤0.7℃.To improve the accuracy and speed of the on-line temperature measurement system for power cables, a method for fitting data reference points was proposed, which uses fiber interleaver filter to replace reference-grating. Least square method is utilized to fit linear dependency between bragg wavelength of fiber grating and tuning voltage of Fabry-Perot filter. With wavelength shift that is demodulated by the tunable Fabry-Perot filter, the system realizes temperature measurement of power cables. The result of the research shows that fiber interleaver filter can replace the reference-gratings in thermostatic environment to calibrate the wavelength shift. Error of reflected wavelength is ± 5pm, and mean square error of temperature is 0.7℃.

关 键 词：光纤BRAGG光栅 最小二乘法 光纤梳状滤波器 电力电缆 F—P可调谐滤波器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN253[自动化与计算机技术—控制科学与工程]