Real-time online monitoring of track deformation during railway construction is crucial for ensuring the safe operation of trains. However, existing monitoring technologies struggle to effectively monitor both static and dynamic events, often resulting in high false alarm rates. This paper presents a monitoring technology for track deformation during railway construction based on dynamic Brillouin optical time-domain reflectometry (Dy-BOTDR), which effectively meets requirements in the monitoring of both static and dynamic events of track deformation. Dy-BOTDR can provide a two-dimensional spatial-temporal distribution map of track strain changes to characterize various events for better monitoring accuracy and lower false alarm rates.
Keywords: Brillouin optical time domain reflectometry; distributed fiber optic sensing; track deformation monitoring.