基于FBG的测斜传感器设计与实现  

Design and Implementation of Clinometer Based on Fiber Bragg Grating

作　　者：李俊鑫[1,2] 强小俊 郎向伟[2] LI Junxin;QIANG Xiaojun;LANG Xiangwei(Shenzhen Research and Design Institute, China Academy of Railway Sciences, Shenzhen 518057, China;Shenzhen Research and Design Institute, China Academy of Railway Sciences, Shenzhen 518057, China)

机构地区：[1]中国铁道科学研究院深圳研究设计院,广东深圳518057 [2]深圳地质灾害监控工程实验室,广东深圳518057

出　　处：《压电与声光》2019年第1期53-56,共4页Piezoelectrics & Acoustooptics

基　　金：中国铁道科学研究院基金资助项目(2016YJ155)

摘　　要：变形监测是进行边坡灾害预警预报的重要依赖手段,为解决当前边坡深部变形监测中存在的不足,研发了一种基于光纤光栅传感技术的测斜仪器。光纤光栅测斜传感器包括刚性单元、柔性感测单元及连接销轴,柔性感测单元为布设有光纤布喇格光栅(FBG)的等强度梁结构,FBG采用在梁表面对称布置的方式以消除温度对测量的影响。边坡内部岩土体变形时,刚性单元随之在连接处发生相对偏转,由柔性感测单元中FBG波长偏移量,利用FBG中心波长与应变、角度的线性关系,得到刚性单元间的相对偏转角度,实现边坡深部变形监测。实验表明,研制的测斜传感器测量单元线性度好,倾角测量灵敏度和分辨率较高,温度造成的误差较小。Deformation monitoring is an important means to predict and forewarn slope geologic disaster. To overcome the drawbacks in the current deep displacement monitoring of slopes, a novel clinometer based on fiber Bragg grating sensing technology was developed. The FBG clinometer sensor comprises a rigid unit, a flexible unit for sensing and the connecting hinge. The flexible sensing unit is an equal-strength beam structure with a fiber Bragg grating, and the FBG adopts a symmetric arrangement on the beam surface to eliminate the influence of temperature on the measurement. The rigid unit will have relative deflection at the joint when the rock and soil inside the slope are deformed. Based on the FBG wavelength offset in the flexible sensing unit and the linear relationship between the central wavelength of FBG and strain and angle, the relative deflection angle between the rigid units can be obtained, and the deep deformation monitoring of the slop can realized. The experiment indicates that the measuring unit of the developed inclinometer has good linearity, high sensitivity and resolution, and the error caused by temperature is small.

关 键 词：光纤布喇格光栅 测斜仪 变形监测 

分 类 号：TN253[电子电信—物理电子学] TM23[一般工业技术—材料科学与工程]