光纤光栅称重传感器研究  

Novel Weigh Sensors Based on Fiber Bragg Grating Sensing Technology

作　　者：翟玉锋[1] 张龙[1] 朱灵[1] 于清华[1] 周喃[1] 吴晓松[1] 刘勇[1] 王安[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所光纤研究室,安徽合肥230031

出　　处：《发光学报》2007年第3期412-416,共5页Chinese Journal of Luminescence

基　　金：安徽省科技厅"十一五"二期攻关基金资助项目(05022035)

摘　　要：提出一种基于光纤光栅传感技术的称重系统。用特种粘贴剂将布喇格光纤光栅(FBG)粘贴于悬臂梁的自由端,当悬臂梁自由端受力发生微挠度弯曲时,光纤光栅将沿轴向发生形变,通过监测布喇格光纤光栅传感器反射波长漂移测量悬臂梁的微挠度变化。通过分析悬臂梁结构,建立悬臂梁受力与挠度的数学关系,进而测量出加载在悬臂梁自由端应力的数值。通过对系统结构理论分析和实验验证,该装置称重测量范围达到50千克力,测量灵敏度达到0.05千克力,线性拟合度达到0.9997。The fiber-optic weigh technology is the process to estimate the gross weight of the loads, by measuring the loads forces acting on the weigh system with fiber-optic sensing technology. Several fiber-optic weigh system have been reported by prior authors, such as the microbending system, the polarimetric system and the interferometric system. Here, we demonstrate a novel weigh system based on fiber Bragg grating（FBG） sensing technology. The sensing principle of FBG is that ： when the physical quantity, strain or temperature, monitored by FBG sensors changes, it will cause the reflected wavelength shift of the FBG sensors. This wavelength shift is proportional to the variation of strain or temperature. Compared with other fiber-optic systems, the FBG-based weigh system, which is simpler in design and easier to be integrated, can offer higher accuracy, longer lifetime, and lower costs simultaneously. In the weigh system, the load-supporting structure is very important. In this experiment, a metal cantilever beam was chosen as the elastic body of the weigh system to support the loads. With the theory of the strength of materials, we analyzed the cantilever beam structure and deduced that the force on the free end of the cantilever beam was direct proportion to the deflection variation of the beam. We could use a FBG to detect the deflection of the beam to calculate the force on the free end of the beam. Based on this conclusion, we designed the cantilever beam with special parameters to meet this weigh system. We also used the ANSYS software to calculate the deflection of the designed cantilever beam, and the result showed that this metal cantilever beam was suitable for this weigh system. In this experiment, in order to use the FBG detect the deflection variation of the cantilever beam, one end of the FBG was adhered on the free end of the standard cantilever beam with special gelatin, then the FBG was dragged to make the FBG reflected wavelength shift about 1 nm. Finally, the other end of the FBG was ad- h

关 键 词：布喇格光纤光栅 微挠度 悬臂梁 ANSYS 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]