光学精密工程2018，Vol.26Issue(2)：325-335,11.DOI:10.3788/OPE.20182602.0325
基于光纤传感技术的三维地应力传感器
Three dimensional in-situ stress sensor based on optical fiber sensing technology
摘要
Abstract
In order to realize the effective monitoring of the spatial stress state of the underground rock formation and its variation.A monitoring method combining plane strain and fiber grating sensing technology was proposed,based on the principle of fiber grating sensing and plane stress state meas-urement.The strain sensor unit was composed of two sets of strain sensor,which were composed of two sets of right angle strain flower and a group of equiaxed strain flower.The three sets of strain flowers were placed in three cylindrical shapes respectively by using carbon fiber laminated composite material.On the probe S1,S2,S3,the three probes were connected with a certain mechanical structure to form the three-dimensional geo-stress sensor of the formation space stress monitoring.The experi-ment of temperature and stress of the fiber strain sensor was carried out,and the stress sensing exper-iment of the whole sensing device was carried out indoors.Experimental results showed that the stress resolution of the fiber strain sensor was 0.017 2 MPa;stress monitoring range of 0-60 MPa;the av-erage error of the maximum principal stress of the probe S1 was 16 .31% , the average error of the maximum principal stress of the probe S2 is 24 .36% ,and the absolute error of the S3 probe was 0 .006 8 MPa .The mean value of the stress space angle error measured by the actual loading stress and the sensor was 1 .24 ° .The monitoring results of the sensor are consistent with the variation of the actual loading stress , which can meet the requirement of continuous monitoring of the spatialstress state of the underground rock.关键词
光纤传感/光纤光栅/地下岩层空间应力/碳纤维层积复合材料/应变花/应变传感单元Key words
optical fiber sensing/Fiber Bragg Grating(FBG)/spatial stress of subsurface rock/carbon fiber material/strain flowers/strain sensor unit分类
信息技术与安全科学引用本文复制引用
仲志成,赵斌,林君,刘玉娟..基于光纤传感技术的三维地应力传感器[J].光学精密工程,2018,26(2):325-335,11.基金项目
国家自然科学基金资助项目(No.41504135) （No.41504135）
吉林省科技厅发展计划资助项目(No.20130206009GX) （No.20130206009GX）
