False Alarms Mitigation in Φ-OTDR System Using Multicore Fiber with Correlation Algorithms

Yvtian Liu1; Huanhuan Liu1; Yihong Xiao1; Xingliang Shen2; Jialong Li2; Hong Dang2; Jinna Chen2; Perry Ping Shum1

10.1109/OGC59456.2023.10314590

2023

979-8-3503-2533-1

2023 IEEE 8th Optoelectronics Global Conference (OGC)

81-85

5-8 Sept. 2023

Shenzhen, China

Phase-sensitive optical-time domain reflectometry (Φ-OTDR) is able to detect vibrations effectively with high sensitivity. It achieves by interrogating coherent Rayleigh backscattering (RBS) light in sensing fiber. However, backscattering light in sensing fiber undergoes fading caused by phase extinction interference or polarization mismatching. Fading will result in serious false alarms when locating real vibration events, especially in weak vibration signal detection. In order to suppress interference fading and exclude false alarms to improve localization accuracy, we propose a multi-core fiber-based Φ-OTDR system. Two cores of the multicore fiber are utilized for sensing, which detect the same vibration event simultaneously. Their backscattering signals will be demodulated for locating respectively and the locating result will pass through a mutual correlation algorithm to eliminate false alarm. As a proof of the concept, experimental results confirm a very successful false alarm reduction effect. It shows great potential in smart detection of acoustic signal, such as partial discharge detection in grid.

Φ-OTDR correlation algorithms multicore fiber false-alarm rate reduction

第一

EI

20235015217390

Alarm systems ; Backscattering ; Errors ; Location ; Partial discharges ; Signal detection

Electricity: Basic Concepts and Phenomena:701.1 ; Information Theory and Signal Processing:716.1

IEEE

1.State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Southern University of Science and Technology, Shenzhen, China
2.Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China

Yvtian Liu,Huanhuan Liu,Yihong Xiao,et al. False Alarms Mitigation in Φ-OTDR System Using Multicore Fiber with Correlation Algorithms[C],2023:81-85.