摘要
针对现有电传感器在高寒地区测量静冰压力存在的问题,提出了一种基于布拉格光纤光栅的静冰压力传感测量系统,可实现对静冰压力的定点在线测量。通过测得冰层内部静冰压力和温度同时变化过程中的光纤光栅布拉格波长,经过温度补偿消除了静冰压力测量过程中温度的影响,利用压力与布拉格光栅中心波长的关系得到静冰压力的测量值。同时,利用混沌光源良好的互相关性,通过相关峰的位置,实现了对静冰压力的定点测量。本实验对-10℃^-5℃温度范围内,实验室条件下的模拟静冰压力进行了测量,对系统进行了温度补偿,温度补偿曲线线性拟合度为99.56%,有效地消除了交叉敏感,可满足实际工程应用中静冰压力的测量要求。
Aiming at the existing problems of electric sensors in measuring the static pressure in the alpineregion, a static ice pressure sensing system based on the fiber Bragg grating sensor is proposed. Accurateonline measurement of the fixed-point static ice pressure can be realized. The Bragg wavelengths of the fi-ber Bragg grating sensor in the ice are measured under different temperatures and strains. Through tempera-ture compensation to eliminate the effect of temperature, strain response of fiber Bragg grating wavelengthwas obtained. Meanwhile,based on the good cross-correlation of chaotic light,the correlation peaks can lo-cate the position of the sensor. Within-10^-5℃,static ice pressure under laboratory conditions was mea-sured. Temperature compensation was made,and the fitting linearity is 0.9956. So the cross-sensitivity canbe eliminated effectively. The requirements of practical engineering applications to measure the static icepressure can be satisfied.
出处
《中国水利水电科学研究院学报》
北大核心
2015年第6期435-441,共7页
Journal of China Institute of Water Resources and Hydropower Research
基金
国家自然科学基金项目(51279122
51205273)
国家自然科学基金中俄国际合作交流项目(51511130042)
水利部公益性行业专项经费项目(1261530110110)
山西省青年科技研究基金项目(2015021097)
关键词
布拉格光纤光栅
静冰压力
温度补偿
互相关
混沌光源
fiber Bragg grating
static ice pressure
temperature compensation
cross-correlation
chaotic light
