柔性曲面变形检测的FBG方法*

作者：樊红朝1，张震2，朱晓锦2 日期：2009-04-21/span> 浏览：3905 查看PDF文档

柔性曲面变形检测的FBG方法*

樊红朝1，张震2，朱晓锦2
(1.宁波工程学院 机械学院,浙江 宁波 315016；2.上海大学 机电工程与自动化学院,上海 200072)

摘要：为实现太阳能帆板、飞机机翼等薄板类曲面的动态检测，构建了一种基于光纤光栅（FBG）的传感阵列系统。将FBG传感器分布式地封装在形状记忆合金（SMA）薄片上，并采用增加预应力方式，扩大FBG检测拉应力的检测范围；利用空分复用（SDM）和波分复用技术（WDM）将FBG阵列布置到曲面上，传感器分布根据曲面应力状况采用植入式分布，应变较大的地方布置稠密，反之稀疏；曲面发生变形时，解调仪器解调出波长变化；计算机对采集数据进行处理，重建曲面形状并实时显示，以实现曲面的动态检测和显示。实验结果表明，此传感阵列系统的波长变化与曲率具有较好的线性关系，传感器布置合理、测量精度高，利用FBG能够实现曲面变形检测。
关键词：光纤光栅；传感阵列；面形检测；形状记忆合金；空分复用技术；波分复用技术
中图分类号：TP825文献标识码：A文章编号：1001-4551(2009)03-0040-04

Application of FBG in flexible surface test
FAN Hong-chao1, ZHANG Zhen2, ZHU Xiao-jin2
(1.School of Mechanics Engineering, Ningbo University of Technology, Ningbo 315016, China;
2.School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China)
Abstract: For realizing the surface measurement of the shell and thin sheet as well as solar array and airplane wing, the sensor array was configured based on fiber bragg grating (FBG) sensors. The sensors were packaged onto the shape memory alloy (SMA) slice with tensile strain in advance that could increase the test scope of tensile. With the technology of spatial-division-multiplexing(SDM) and wavelength-division-multiplexing(WDM), the sensors were embedded into the surface based on the strain of thin shell. The sensor was dense, if the strain was great, but in reverse was sparse. When the surface vibrated, the wavelength of the sensors shifted. The demodulation device tested the shifts and transmitted to the computer. The computer converted the shifts into the curvature and reconstructed the surface according to the curvature information. The experiment result shows that there is a linear relationship between the curvature and the wavelength shift. The distribution of the sensors is in reason and the precision is high.
Key words: fiber bragg grating(FBG); sensor array; surface test; shape memory alloy(SMA); spatial-division-multiplexing(SDM); wavelength-division-multiplexing(WDM)
参考文献(References):
［1］CAMILLO J T. Surface Reconstruction from Feature based Stereo［C］//Proceedings of the Ninth IEEE International Conference on Computer Vision. France:［s.n.］,2003：184-190.
［2］曲芳,钟金钢.数字相移技术用于不连续复杂物体的三维面形测量［J］.光学技术,2004,30(4)：478-480.
［3］邓劲莲,屠立,王循明.基于三坐标测量机的曲面轮廓反向工程数字化测量方法［J］.机电工程,2006,23(6)：22-24.
［4］REINHARDT W, WOLFGANG E, HARTMUT B. Optical Fiber Grating Sensor Networks and their Application in Electric Power Facilities Aerospace and Geotechnical Engineering［C］//Proceedings of OFS 2002. Portland:[s.n.],2002：49-54.
［5］张伦伟,钱晋武,章亚男,等.基于FBG传感网络的新型内窥镜形状实时检测系统［J］.机械工程学报,2006,42（2）：177-182.
［6］HILL K. Smart structures through embedding optical fiber strain sensing［J］. Smart Materials Bulletin,2001(5)：7-10.
［7］SHI C Z, CHAN C C, JIN W. Improving the performance of a FBG sensor network using a genetic algorithm［J］. Sensors and Actuators A: Physical,2003,107(1)：57-61.
［8］张伦伟,钱晋武,沈林勇,等.光纤光栅大曲率传感器的试验研究［J］.仪表技术与传感器,2003(8)：1-5.
［9］吴家麒,杨东英,钱晋武,等.空间曲率检测中的标定误差分析和标定方法［J］.光学精密工程,2003,11(2)：166-170.
［10］梁伟文，戴珏.基于边界采样的插值Catmull-Clark细分曲面造型［J］.机电工程,2005,22（3）：48-50.