caa a22 4500 475843193 CHVBK 20180406123906.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1023/A:1026575024826 doi (NATIONALLICENCE)springer-10.1023/A:1026575024826 Pressure Vessel Wall Thinning Detection Using Multiple Pairs of Fiber Bragg Gratings For Unbalanced Strain Measurements [Elektronische Daten] [Yu-Lung Lo, Po-Hsun Sung, Horng-Jou Wang, Lien-Wen Chen] This paper proposes a method for using a pair of identical fiber Bragg gratings to measure the unbalanced strain factor in an isothermal-mechanical system. Cascading two identical fiber Bragg gratings, the unbalanced strain factor caused by the disturbance can be interrogated from the peak difference of the two reflecting Bragg wavelengths. If the mechanical system is in an isothermal environment, the thermal variations in the Bragg grating detection system can be automatically compensated. To verify the feasibility of the unbalanced strain detection using a pair of fiber Bragg gratings, the wall-thinning monitor in a pressure vessel system was investigated. The proposed technique is easy to install, immune to electro-magnetic and thermal interference, and highly sensitive in-time to remote monitoring for fiber optic smart structures. A finite element model (FEM) is used to simulate the wall thinning in a pressure vessel system. The minimum detectable unbalanced strain and cross-talk between two reflecting Bragg wavelengths were investigated. Plenum Publishing Corporation, 2000 Fiber Bragg grating sensors nationallicence unbalanced system nationallicence optic fiber smart structures nationallicence Lo Yu-Lung E-mail: loyl@mail.ncku.edu.tw aut Sung Po-Hsun Department of Mechanical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan aut Wang Horng-Jou Department of Mechanical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan aut Chen Lien-Wen Department of Mechanical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan aut Journal of Nondestructive Evaluation Kluwer Academic Publishers-Plenum Publishers 19/3(2000-09-01), 105-113 0195-9298 19:3<105 2000 19 10921 https://doi.org/10.1023/A:1026575024826 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026575024826 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lo Yu-Lung E-mail: loyl@mail.ncku.edu.tw aut NATIONALLICENCE 700 1- Sung Po-Hsun Department of Mechanical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan aut NATIONALLICENCE 700 1- Wang Horng-Jou Department of Mechanical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan aut NATIONALLICENCE 700 1- Chen Lien-Wen Department of Mechanical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Kluwer Academic Publishers-Plenum Publishers 19/3(2000-09-01), 105-113 0195-9298 19:3<105 2000 19 10921 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer