摘要
为提高光栅阵列测温仪表的测量精度,使之满足大容量、长距离、高精度的测量要求,采用高低温交变湿热试验箱装置,在恒定湿度、无应力的情况下对光纤Bragg光栅(FBG)传感器的温度传感特性进行了实验研究,温度范围为-20~80℃。结果表明各FBG传感器的中心波长λB与温度T的线性相关系数均低于0.999;若采用二阶拟合曲线,其相关系数均大于0.9998,因此可采用二阶拟合曲线表示FBG传感器中心波长与温度的关系。由于各FBG传感器的二阶拟合曲线系数a、b、c均不同,无法用一组固定系数标定所有FBG传感器,因此提出了一种实用的精确到点的温度灵敏系数标定算法,并对该算法进行了验证,结果表明此算法能有效提高光栅阵列测温仪表的精度,对实际工程应用具有重要意义。
In order to improve the measure precision of the grating array thermometer instrument,make it meet the requirements of large capacity,long distance,high precision measurement,Using high and low temperature alternating humidity and heat test box device,at constant humidity,under the condition of stress free on the temperature of the optical fiber Bragg grating(FBG)sensor sensing characteristic has carried on the experimental study of temperature range is-20~80℃.The results show that the linear correlation coefficient between the central wavelength and temperature of each FBG sensor is lower than 0.999.If the second-order fitting curve is used,the correlation coefficients are all greater than 0.9998.Therefore,the second-order fitting curve can be used to represent the relationship between the central wavelength of FBG sensor and temperature.Due to the quadratic curve fitting coefficient of FBG sensora,b,c are different,can’t use a fixed set of coefficient o fall FBG sensor calibration,therefore this paper proposes a practical calibration algorithm precisely to point temperature sensitive coefficient,and the algorithm are verified,the results show that this algorithm can effectively improve the accuracy of grating array thermometer instrument,it is of great significance for practical engineering applications.
作者
胡文芳
江山
李凯
HU Wen fang;JIANG Shan;LI Kai(Wuhan institute of Posts and Telecommunications,Wuhan 430000,China;Wuhan Feng Li Optoelectronic Technology Co.,LTD.,Wuhan 430000,China)
出处
《电子设计工程》
2020年第7期64-68,73,共6页
Electronic Design Engineering
关键词
FBG传感器
温度
光栅阵列测温仪表
精确到点标定温度灵敏系数算法
FBG sensor
temperature
grating array thermometer
precise point-to-point calibration temperature sensitivity coefficient algorithm
