Based on phase-sensitive optical time domain reflectometer (Φ-OTDR), an oil and gas pipeline pre-warning system is demonstrated and applied to monitor products pipeline laying along an optical cable. Theoretically, the longest monitor distance can be as long as the coherent length of light source through connecting repeater optical amplifiers, which can amplify not only pulse light but also Rayleigh scattering light. An appropriate algorithm derived from support vector machine (SVM) is developed to identify and classify different vibration signals along pipeline, including artificial digging, mechanical excavation and vehicles crossing. Field test in Gangzao pipeline shows that the pre-warning system can detect artificial digging within 5m, mechanical excavation and vehicles crossing within 50m.

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91578W (2 June 2014); doi: 10.1117/12.2054698

Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)