飞秒光纤光栅高温测量方法研究  

A high temperature measurement method using femtosecond fiber Bragg gratings

作　　者：张鹏浩 陈爽[1] 武洪波[1] ZHANG Penghao;CHEN Shuang;WU Hongbo(Changcheng Institute of Metrology&Measurement,Beijing 100095,China)

机构地区：[1]航空工业北京长城计量测试技术研究所,北京100095

出　　处：《计测技术》2023年第5期1-6,共6页Metrology & Measurement Technology

摘　　要：为了实现高温环境下温度的准确测量,利用飞秒激光制备的光纤布拉格光栅(Fiber Bragg Gratings,FBG)杰出的热稳定性,提出一种基于飞秒光纤光栅的高温测量方法。利用光纤热光系数、热膨胀系数与温度之间的依赖关系,建立了FBG中心波长-温度模型;由于该模型不存在解析解,利用单点中心波长-温度特解和四次多项式拟合温度-中心波长工作曲线。基于该工作曲线和预退火(1000℃,20 h)FBG在常温至900℃范围内进行温度测量实验,结果表明最大测量偏差不超过±2℃。本方法仅需标定单点中心波长-温度即可实现宽温度范围内的温度准确测量,简洁有效,在航空航天、核电冶金等领域中具有重要的研究和应用价值。In order to achieve accurate temperature measurement in high-temperature environments,a measurement method based on femtosecond fiber Bragg gratings(FBG)is proposed,utilizing the outstanding thermal stability of FBG fabricated by femtosecond lasers.A FBG central wavelength-temperature model was established based on the dependence of thermal optical coefficient and thermal expansion coefficient on temperature.Since there is no analytical expression for the model,the temperature-central wavelength working curve is fitted by using the single point specific solution of central wavelength-temperature and quartic polynomial.Based on this working curve and pre annealing(1000℃,20 h)FBG,temperature measurement experiments were conducted from room temperature to 900℃,and the results showed that the maximum measurement deviation was less than±2℃.This method only needs to calibrate a single point central wavelength-temperature to achieve accurate temperature measurement over a wide temperature range.It is simple and effective,and has important research and application value in the fields such as aerospace,nuclear power metallurgy,etc.

关 键 词：飞秒激光 光纤布拉格光栅 工作曲线 退火 高温测量 

分 类 号：TB942[一般工业技术—计量学] TP21[机械工程—测试计量技术及仪器]