摘要
针对山体滑坡中大力值监测的应用需求,提出了基于光纤Bragg光栅(FBG)的5 MN力值传感器。该传感器采用8根FBG构成4组光栅偶对圆柱弹性体的应变进行采集,光栅偶能有效地补偿温度对FBG尺寸的影响。通过ANSYS数值模拟计算并优化了圆柱弹性体的结构尺寸,并按照国家规程进行了传感器检定实验。实验结果表明,该传感器的直径为124mm,长度为302mm,应力测量范围为500~5 000kN,综合精度为1%,最大力值对应的波长变化为2 567pm,灵敏度为2kN/pm。该传感器除具有光栅传感的基本特点以外还具有结构简单、量程大、精度高等优点,不仅适用于滑坡力值监测,还适用于建筑、化工、煤矿、军事等领域的力值监测。
In view of the increasing demand for strong force value monitoring in landslide, a 5 MN force sensor based on Fiber Bragg Grating（FBG） was proposed. The sensor adopted 8 FBGs to com- pose 4 group of grating pair for cylindrical elastic strain collection. The grating pair can effectively compensate the effect of temperature on the size of FBG. The dimension of the cylindrical elastomer was determined and optimized via ANSYS numerical simulation. Then the force sensor was tested ac- cording to the national regulations. The experimental results show that the sensor with diameter of 124 mm and length of 302 mm, can provide a measurement range of 500--5000 kN and an overall ac- curacy of 1%. In addition, the wavelength variation corresponding to the maximum force value is 2 567 pm and the sensitivity is 2 kN/pm. The sensor is characterized by simple structure, large meas- uring range and high precision besides basic characteristics of the grating sensing. The sensor can heapplied to force monitoring not only in landslide, but also in construction, chemical industry, coal mine, military and other fields.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2017年第4期857-866,共10页
Optics and Precision Engineering
基金
国家自然科学资助项目(No.51178488
No.51478066)
