Soil-embedded optical fiber sensing cable interrogated by Brillouin optical-time domain reflectometry (B-OTDR) and optical frequency-domain reflectometry (OFDR) for embedded cavity detection and sinkhole warning system - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Measurement Science and Technology Année : 2009

Soil-embedded optical fiber sensing cable interrogated by Brillouin optical-time domain reflectometry (B-OTDR) and optical frequency-domain reflectometry (OFDR) for embedded cavity detection and sinkhole warning system

Résumé

A soil-embedded optical fiber sensing cable is evaluated for an embedded cavity detection and sinkhole warning system in railway tunnels. Tests were performed on a decametric structure equipped with an embedded 110 m long fiber optic cable. Both Brillouin optical time-domain reflectometry (B-OTDR) and optical frequency-domain reflectometry (OFDR) sensing techniques were used for cable interrogation, yielding results that were in good qualitative agreement with finite-element calculations. Theoretical and experimental comparison enabled physical interpretation of the influence of ground properties, and the analysis of embedded cavity size and position. A 5 mm embedded cavity located 2 m away from the sensing cable was detected. The commercially available sensing cable remained intact after soil collapse. Specificities of each technique are analyzed in view of the application requirements. For tunnel monitoring, the OFDR technique was determined to be more viable than the B-OTDR due to higher spatial resolution, resulting in better detection and size determination of the embedded cavities. Conclusions of this investigation gave outlines for future field use of distributed strain-sensing methods under railways and more precisely enabled designing a warning system suited to the Ebersviller tunnel specificities.

Dates et versions

hal-00451163 , version 1 (28-01-2010)

Identifiants

Citer

Vincent Lanticq, Emmanuel Bourgeois, P. Magnien, L. Dieleman, G. Vinceslas, et al.. Soil-embedded optical fiber sensing cable interrogated by Brillouin optical-time domain reflectometry (B-OTDR) and optical frequency-domain reflectometry (OFDR) for embedded cavity detection and sinkhole warning system. Measurement Science and Technology, 2009, 20, 10 p. ⟨10.1088/0957-0233/20/3/034018⟩. ⟨hal-00451163⟩
72 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More