Prof. Yu WANG
Taiyuan University of Technology, China
Title: Advanced phase-sensitive optical time-domain reflectometer technology and its applications
Abstract:
Phase-sensitive optical time domain reflectometer (Φ-OTDR) technology can achieve distributed, long-distance and highly sensitive vibration event detection through the demodulation of Rayleigh backward scattering (RBS) signal. But there are still technical bottlenecks in the continuous improvement of performance, and the use of frequency-shift devices to generate multi-frequency RBS signals is an effective way to break through the bottleneck. To solve this problem, a multi-frequency detection Φ-OTDR system based on optical fiber frequency-shift delay loop is proposed, which can reduce the interference fading probability through the aggregation and multiplexing of multi-frequency RBS beat signals. Secondly, a novel method for suppressing crosstalk noise by compressed sensing in multi-frequency detection Φ-OTDR is proposed, which uses electro-optical modulation to generate multiple frequency-shift components. The frequency domain compression is also used to reduce the effect of crosstalk noise in each component. Perturbed signal sensing with an upper frequency limit is realized. Finally, a non-crosstalk frequency division multiplexing Φ-OTDR system is designed. The crosstalk noise between multicarrier probe pulses can be suppressed using cosine roll-off processing algorithm. The frequency bandwidth is extended with multi-channel frequency division multiplexing. The partial discharge ultrasonic detection and the transmission lines galloping detection experiments based on Φ-OTDR are carried out. The above research provides an important solution for the advanced Φ-OTDR system to break through the technical bottleneck and carry out more field applications.
Biography:
Dr. WANG Yu is an associate professor and doctoral supervisor at Taiyuan University of Technology. He got Ph.D. degree from Cergy-Pontoise University of France. His recent research efforts have focused on optical fiber sensing technology. His research has earned a number of international/national recognitions, including one Second Prize and one Third Prize of Shanxi Provincial Science and Technology Award, and one Second Prize of Shanxi Provincial Teaching Achievement Award. He has been selected into the list of the World's Top 2% Scientists, the Shanxi Provincial Outstanding Youth Science Fund Support Program, and the Shanxi Provincial "San Jin Outstanding Talents" Support Program. He has presided more than 20 scientific and technological projects, and holds over 50 authorized invention patents. Dr. Wang has authored/co-authored over 60 SCI-indexed journal papers, and has been also invited to give more than 10 invited talks at international/national conferences.