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Traffic Vibration Signal Analysis of DAS Fiber Optic Cables with Different Coupling Based on an Improved Wavelet
Yuhang An1, Jihui Ma1, Tuanwei Xu2,3
1Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, Ministry of Transport, Beijing Jiaotong University, Beijing 100044, China.
Sensors (Basel, Switzerland)
|July 8, 2023
Summary
Distributed Acoustic Sensing (DAS) effectively monitors vibrations. Cement-bonded fiber optic cables on road shoulders provide the best vibration data for practical applications.
Area of Science:
- Geophysics
- Sensor Technology
- Civil Engineering
Background:
- Distributed Acoustic Sensing (DAS) utilizes fiber optic cables as dense arrays of vibration sensors.
- DAS offers high spatial and temporal resolution for real-time vibration monitoring.
- Effective vibration data acquisition with DAS depends on robust fiber-optic-to-ground coupling.
Purpose of the Study:
- To evaluate the effectiveness of different Distributed Acoustic Sensing (DAS) deployment methods for detecting vehicle-induced vibrations.
- To compare vibration signal quality from uncoupled, underground, and cement-bonded fiber optic cable installations.
- To identify the optimal DAS deployment strategy for practical traffic monitoring applications.
Main Methods:
- Vehicle vibrations were monitored using a DAS system on a university campus road.
- Three deployment methods were tested: uncoupled fiber, underground ducts, and cement-bonded cables.
- An improved wavelet threshold algorithm was used to analyze the acquired vibration signals.
Main Results:
- The cement-bonded fixed fiber optic cable on the road shoulder yielded the most effective vibration detection.
- The uncoupled fiber on the road showed moderate effectiveness.
- Underground communication fiber optic cable ducts were found to be the least effective for vibration sensing.
Conclusions:
- The deployment method significantly impacts the quality of vibration data obtained via DAS.
- Cement-bonded fiber optic cables on road shoulders are recommended for practical traffic vibration monitoring using DAS.
- Findings have implications for optimizing DAS implementation in various engineering and research fields.
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