差动式光纤光栅位移计及其温度特性的研究  

Research of Differential Optical Fiber Grating Displacement Cell and It's Temperature Characteristic

作　　者：王俊杰[1] 付晓红[1] 姜德生[1] 张丰涛[1] 

机构地区：[1]武汉理工大学光纤传感与信息处理教育部重点实验室,武汉430070

出　　处：《武汉理工大学学报》2007年第12期112-115,共4页Journal of Wuhan University of Technology

基　　金：武汉市青年科技晨光计划(20065004116-20)

摘　　要：基于拉伸弹簧和悬臂梁组成一复合结构实现了光纤光栅(FBG)位移传感器的差动式测量,研究表明:传感器位移分辨率为0.05%,重复性为0.183%,回程误差为0.134%,线性误差为0.14%,基本误差为±0.326%;以20℃为基准,在(-30—+100℃),温度引起的零点漂移不超过满量程的2.86%;随着试验温度范围减小至传感器日常使用范围(-20—+60℃),零点温度漂移也减小至满量程的0.7%,传感器温度特性完全满足需求。最后,给出了传感器温度特性不一致的主要原因以及进一步改善传感器位移传感特性和热稳定性的方法,并指出改变悬臂梁和拉伸弹簧的几何尺寸就可实现不同量程、不同位移分辨力的测量。Based on the composite structure which consisted of pulling spring and cantilever, a differential optical fiber grating displacement cell has been designed and studied. Research indicated that the sensor resolving ratio is up to 0.05 % FS, the repeatability, hysteresis, and nonlinearity of the sensor over the full displacement range were 0. 183 %, 0. 134 % and 0.14 %, respectivdy. Therefore, the overall measurement accuracy achieved was ± （0.183 ± 0.14 ± 0. 134/2） （percent） ≈ ± 0. 326 % over the full range. Make reference to the temperature 20 ℃, Zero temperature excursion gave a measurement uncertainty of 2.86 percent over the full range within the temperature range - 30- ＋ 100 ℃, along with the testing temperature minished to its operating temperature range of - 20-＋ 60 ℃, the maximum zero temperature excursion was reduced to 0.7% FS, the temperature characteristic completely tally with the actual demand. Finally, the main reason why the temperature characteristic of the sensor was differed. The methods of how to improve the static displacement sensing characteristic and heat stability were presented, moreover showed that this sensor can realize different range and different resolution displacement measurement, by adjusting the geometrical size of the cantilever and the pulling spring.

关 键 词：光纤FBG位移计 光纤光栅 差动式测量 零点温度漂移 

分 类 号：TN253[电子电信—物理电子学]