scholarly journals An Application of BOTDR to the Measurement of the Curing of a Bored Pile

2021 ◽  
Vol 11 (1) ◽  
pp. 418
Author(s):  
Lei Gao ◽  
Chuan Han ◽  
Omar Abdulhafidh ◽  
Yunhao Gong ◽  
Yingjie Jin
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Monitoring Method ◽  
Optical Time Domain Reflectometer ◽  
Bored Pile ◽  
Sensing Technology ◽  
Reliable Monitoring ◽  
Distributed Fiber Optic Sensor ◽  
Optical Time ◽  
Pile Deformation

In order to study the deformation of a bored pile during concrete curing, it is necessary to monitor the strain of the pile. In this paper, Brillouin optical time domain reflectometer (BOTDR) technology is used to monitor the pile strain during concrete curing, and reliable monitoring data are obtained. These data provide a basis for the study of pile deformation and pile–soil interaction during curing of bored cast-in-place piles. Compared with the traditional point strain sensor, the distributed fiber optic sensor is simple in layout and highly accurate; it can fully reflect the strain changes of the pile; the experiment also shows the advantages of distributed fiber optic sensing technology over the traditional point monitoring method.

LabVIEW Applications for Fiber-Optic Remote Test and Fiber Sensor Systems

2014 ◽  
Vol 610 ◽  
pp. 216-220
Author(s):  
Liang Yu Su
Keyword(s):  
Time Domain ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Fiber Sensor ◽  
Optic System ◽  
Optical Time Domain Reflectometer ◽  
Optic Sensor ◽  
Optical Time ◽  
Fiber Optic System ◽  
Time Domain Reflectometer

This paper demonstrates applications of LabVIEW in automatic test measurement of fiber optic system.First,the LabVIEW applications in fiber optic system and the basics of instrument connectivity are presented.Then,the aspects of hardware communication to external instruments through GPIB and serial interfaces are analyzed.Next,self-calibrating automated characterization system for depressed cladding applications is demonstrated utilizing the LabVIEW’s GPIB interface. Results of the manual and automatic measurements and the analysis of the measurement trace obtained from the optical time domain reflectometer (OTDR) are shown.In the end,two applications of LabVIEW in fiber optic sensor system are discussed.

Distributed monitoring method for upheaval buckling in subsea pipelines with Brillouin optical time-domain analysis sensors

2016 ◽  
Vol 20 (2) ◽  
pp. 180-190 ◽  
Author(s):  
Xin Feng ◽  
Wenjing Wu ◽  
Dewei Meng ◽  
Farhad Ansari ◽  
Jing Zhou
Keyword(s):  
Axial Force ◽  
Fiber Optic ◽  
Complex Loading ◽  
Time Domain Analysis ◽  
Fiber Optic Sensor ◽  
Distributed Monitoring ◽  
Monitoring Method ◽  
Upheaval Buckling ◽  
Distributed Fiber Optic Sensor ◽  
Longitudinal Strains

A method for monitoring the upheaval buckling of subsea buried pipelines by distributed optical fiber sensors is introduced. The proposed method originates from the fact that the bucked pipe has the deterministic patterns of the bending-induced and axial force–induced strains, which can be used to identify the pre- and post-buckling states of the pipe. The challenge for utilizing these features is that the distributed fiber optic sensor can only measure the compound strain created by both bending and axial compression. A monitoring scheme by placing three sensors with [Formula: see text] space around the circumference of the pipeline was proposed in this article. An approach was presented to extract the bending-induced and axial force–induced strains from the longitudinal strains measured by the distributed fiber optic sensors. The experimental programs were then designed to investigate the feasibility of the proposed method. It is demonstrated that the proposed method is possible to detect the occurrence of buckling in the pipe. However, further research is necessary in order to examine the efficiency of the proposed approach under the complex loading patterns at subsea levels.

Disturbance Detection in Distributed Fiber-Optic Sensor Based on Time-Delay Estimation

2010 ◽  
Vol 30 (6) ◽  
pp. 1603-1607 ◽  
Author(s):  
许海燕 Xu Haiyan ◽  
徐锲 Xu Qie ◽  
肖倩 Xiao Qian ◽  
张毅 Zhang Yi ◽  
贾波 Jia Bo
Keyword(s):  
Time Delay ◽  
Fiber Optic ◽  
Time Delay Estimation ◽  
Fiber Optic Sensor ◽  
Delay Estimation ◽  
Optic Sensor ◽  
Distributed Fiber Optic Sensor ◽  
Disturbance Detection

scholarly journals Experimental Study on Deformation Monitoring of Bored Pile Based on BOTDR

2019 ◽  
Vol 9 (12) ◽  
pp. 2435 ◽  
Author(s):  
Lei Gao ◽  
Chuan Han ◽  
Zhongquan Xu ◽  
Yingjie Jin ◽  
Jianqiang Yan
Keyword(s):  
Optical Fiber ◽  
Noise Removal ◽  
Deformation Monitoring ◽  
Optical Time Domain Reflectometer ◽  
Fiber Sensing ◽  
Bored Pile ◽  
Sensing Technology ◽  
Optical Fiber Sensing ◽  
Unbiased Risk ◽  
Distributed Optical Fiber

In order to study the deformation of bored pile, it is necessary to monitor the strain of the pile. The distributed optical fiber sensing technology realizes the integration of sensing and transmission, which is incomparable with traditional point monitoring method. In this paper, the Brillouin optical time domain reflectometer (BOTDR) distributed optical fiber sensing technology is used to monitor the deformation of the bored pile. The raw data monitored by BOTDR is processed by the wavelet basis function, that can perform noise removal processing. Three different methods of noise removal are chosen. Through the processing, the db5 wavelet is used to decompose the deformation data of bored pile monitored by BOTDR into two layers. The decomposed high-frequency signal is denoised by the Stein-based unbiased risk threshold, rigrsure. The decomposed data is smoothed by the translational mean method, and the final data after denoising and smoothing processing is real and reliable. The results of this study will provide data support for the deformation characteristics of bored pile, and also show the advantages of distributed optical fiber sensing technology.

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