Metro tunnel lining, tracks and along-route infrastructure
Metro-tunnel photograph (application context). Philip Mallis (resized/WebP) · CC BY-SA 2.0

Monitoring task and sensing route

Dynamic-strain features from adjacent locations can be analyzed together. Interpretation should also include train timetables, construction records and cable coupling.

Original conceptual layout: Longitudinal tunnel fiber and the optical-fiber route
Original OriginSense application concept showing observation relationships, not a customer installation.

Published research observation

Han and colleagues combined numerical models and tunnel experiments, updating features through spatial correlation between dense measurement locations before classification. [1]

Research evidence and proposed validation
ItemDescription
Study settingSimulation and actual-tunnel experiments
Research observationNeighboring observations inform vibration classification
Proposed comparisonMap fiber distance to tunnel chainage, structural sections and construction locations.

Validation and integration priorities

Collect separate train, background and documented excitation records with source time and position.

Evaluate independent events and prevent leakage between neighboring channels or windows from the same event.

Reference

[1] Han H et al. Abnormal Vibration Identification of Metro Tunnels on the Basis of the Spatial Correlation of Dynamic Strain from Dense Measurement Points of Distributed Sensing Optical Fibers. Sensors (Basel, Switzerland) (2025). DOI: 10.3390/s25206266.