Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

2019 ◽  
Vol 27 (1) ◽  
Author(s):  
Shangjiu Meng ◽  
Yiqiang Sun ◽  
Miao Wang
Keyword(s):  
Fiber Bragg Grating ◽  
Deformation Monitoring ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Seasonally Frozen Regions

Measurement of the Thermal Expansion for Space Structures Using Fiber Bragg Grating Sensors and Displacement Measuring Interferometers

2008 ◽  
Author(s):  
Hong-Il Kim ◽  
Lae-Hyong Kang ◽  
Jae-Hung Han
Keyword(s):  
Fiber Bragg Grating ◽  
Real Time ◽  
Deformation Monitoring ◽  
Space Environment ◽  
Space Structures ◽  
Bragg Grating ◽  
Environment Change ◽  
Time Deformation ◽  
Fiber Bragg Grating Sensors ◽  
Fbg Sensors

Dimensional stability of the space structures, such as large telescope mirrors or metering substructures, is very important because even extremely small deformations of these structures might degrade the optical performances. Therefore, precise deformation data of the space structures according to environment change are required to design these structures correctly. Also, real-time deformation monitoring of these structures in space environment is demanded to verify whether these structures are properly designed or manufactured. FBG (fiber Bragg grating) sensors are applicable to real time monitoring of the space structure because they can be embedded onto the structures with minimal weight penalty. In this research, therefore, thermal deformation measurement system for the space structures, composed of FBG sensors for real time strain measurement and DMI (displacement measuring interferometers) for accurate specimen expansion data acquisition, is developed. Thermal strains measured by distributed FBG sensors are evaluated by the comparison with the strains obtained by highly accurate DMI.

Open pit slope deformation monitoring by fiber Bragg grating sensors

2014 ◽  
Vol 54 (1) ◽  
pp. 011003 ◽  
Author(s):  
Guoquan Xu ◽  
Daiyu Xiong ◽  
Yun Duan ◽  
Xiaoshuang Cao
Keyword(s):  
Fiber Bragg Grating ◽  
Deformation Monitoring ◽  
Slope Deformation ◽  
Open Pit ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors

scholarly journals Distributed Deformation Monitoring for a Single-Cell Box Girder Based on Distributed Long-Gage Fiber Bragg Grating Sensors

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2597 ◽  
Author(s):  
Sheng Shen ◽  
Shao-Fei Jiang
Keyword(s):  
Single Cell ◽  
Fiber Bragg Grating ◽  
Maximum Error ◽  
Deformation Monitoring ◽  
Bragg Grating ◽  
Shear Lag ◽  
Box Girders ◽  
Box Girder ◽  
Hollow Beam ◽  
Fiber Bragg Grating Sensors

Distributed deformation based on fiber Bragg grating sensors or other kinds of strain sensors can be used to monitor bridges during operation. However, most research on distributed deformation monitoring has focused on solid rectangular beams rather than box girders—a kind of typical hollow beam widely employed in actual bridges. The deformation of a single-cell box girder contains bending deflection and also two additional deformations respectively caused by shear lag and shearing action. This paper revises the improved conjugated beam method (ICBM) based on the long-gage fiber Bragg grating (LFBG) sensors to satisfy the requirements for monitoring the two additional deformations in a single-cell box girder. This paper also proposes a suitable LFBG sensor placement in a box girder to overcome the influence of strain fluctuation on the flange caused by the shear lag effect. Results from numerical simulations show that the theoretical monitoring errors of the revised ICBM are typically 0.3–1.5%, and the maximum error is 2.4%. A loading experiment for a single-cell box gilder monitored by LFBG sensors shows that most of the practical monitoring errors are 6–8% and the maximum error is 11%.

scholarly journals Deformation Monitoring for Chinese Traditional Timber Buildings Using Fiber Bragg Grating Sensors

Sensors ◽  
2018 ◽  
Vol 18 (6) ◽  
pp. 1968 ◽  
Author(s):  
Ni-Lei Li ◽  
Shao-Fei Jiang ◽  
Ming-Hao Wu ◽  
Sheng Shen ◽  
Ying Zhang
Keyword(s):  
Fiber Bragg Grating ◽  
Deformation Monitoring ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors
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