Distributed cracks detection by BOTDA and its application in corrosion cracking monitoring

Title: Distributed cracks detection by BOTDA and its application in corrosion cracking monitoring
Author(s): Y. He, J.H. Mao, W.L. Jin, and J. Xia
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 572 - 577
Total Pages: 6
Nb references: 10
Language: English

Abstract: Cracking monitoring is an important means to evaluate structural health state. Distributed optical fiber sensor based on Brillouin scattering can measure and monitor strain and temperature along a optical fiber. It can effectively avoid undetected phenomenon existed in a point-wise test method. It also owns characteristics of electrical insulation and magnetic interference; therefore, it is suitable for corrosion-induced cracking monitoring. In this paper, the theoretical model of cracking monitoring based on Brillouin Optical Time Domain Analysis (BOTDA) is introduced, and the numerical equation between fiber strain and cracking width is established by a calibration test. The optical fiber sensors are bonded around cylindrical RC specimen to monitor the time-dependent corrosion process which is simulated by an accelerated corrosion test. The time of initial cracking is judged and also cracking width during the whole experiment is estimated. The feasibility of reinforcement corrosion monitoring based on BOTDA has been proved.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00