Analysis of Field Trial Results for Excavation-Activities Monitoring with φ-OTDR
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View abstract on PubMed
Summary
This summary is machine-generated.Protecting underground fiber optic cables from excavation damage is vital. This study shows intensity-based phase-sensitive optical time-domain reflectometer (φ-OTDR) can detect and differentiate various excavation activities by analyzing vibration signals.
Area Of Science
- Telecommunications Engineering
- Fiber Optic Sensing
- Civil Engineering
Background
- Underground telecommunication cables face significant risks from construction and excavation.
- Accidental damage to these critical infrastructure assets can lead to service disruptions and costly repairs.
Purpose Of The Study
- To evaluate the effectiveness of intensity-based phase-sensitive optical time-domain reflectometer (φ-OTDR) for monitoring excavation activities near underground fiber optic cables.
- To analyze the distinct vibration signatures produced by different types of excavation events.
Main Methods
- Field trials were conducted at five sites to monitor excavation activities.
- Vibration signals from individual events (cutting, hammering, digging, tamping) and mixed events were recorded using φ-OTDR.
- Frequency spectrum analysis was performed on the collected vibration data.
Main Results
- Different excavation activities generate unique vibration signal features.
- Cutting, hammering, and tamping events typically exhibit fundamental peak frequencies between 11-15 Hz and 30-40 Hz.
- Digging events produced broadband frequency spectra without a distinct peak, while environmental factors influenced signal characteristics.
Conclusions
- Intensity-based φ-OTDR is a viable technology for real-time monitoring of excavation activities near underground fiber optic cables.
- Understanding the distinct vibration signatures aids in identifying and preventing potential cable damage.
- The findings support the practical implementation of this technology for infrastructure protection.
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