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Proceedings Article

Customization and calibration of BOTDR sensors for underground structural health monitoring

[+] Author Affiliations
Wai Lun Sham, Yaowen Yang, Muley Pravin

Nanyang Technological Univ. (Singapore)

Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842A (March 31, 2011); doi:10.1117/12.880345
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From Conference Volume 7984

  • Health Monitoring of Structural and Biological Systems 2011
  • Tribikram Kundu
  • San Diego, California, USA | March 06, 2011

abstract

In recent years, it is becoming more common to use fiber optic sensors (FOS) in the structural health monitoring (SHM) sector, especially in the civil engineering field. A number of surface-mountable sensor system for FOS have been developed in the past years, the recent development of Brillouin Optical Time Domain Reflectometry (BOTDR) was a great evolution towards the SHM system development, it inspired the new edge of FOS SHM system. Different from the traditional monitoring instruments, it provides distributed, long distance, real-time, interference free and high accuracy/precision measurement data. It is now possible to achieve "continuous" measurement data and this SHM technique is applicable in area that is inaccessible. The research aims to solve the problems which exist in the convergence measurement using the conventional measuring methods, however, there is still a gap between the lab experiments and field applications. Limited research has been conducted on how to maximize its possible applications due to its brittle and fragile material nature. A number of additional considerations for a successful pairing of these two must be taken into account for successful field applications. This article provides a short review on underground monitoring techniques and FOS SHM systems. The focuses is on examine (i) the feasibility and effectiveness of different BOTDR sensors installation methods (ii) the suitable commercially-available o sensing cable for underground application (iii) the sensing performance of customized sensor protection package BOTDR sensor that manufactured involving layers of fiber reinforced composites. This research serves a bridge in between the technology advancement to the creation of a structure health monitoring system with practical application, numerical simulation and theoretical analysis aspects, and also to provide the insights into the mechanisms of BOTDR.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Wai Lun Sham ; Yaowen Yang and Muley Pravin
"Customization and calibration of BOTDR sensors for underground structural health monitoring", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842A (March 31, 2011); doi:10.1117/12.880345; http://dx.doi.org/10.1117/12.880345


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