Lateral positioning of vibration source for underground pipeline monitoring based on ultra-weak fiber Bragg grating sensing array. (February 2021)

• Record Type: Journal Article
• Authors: Jiang, Jinpeng; Liu, Fang; Wang, Honghai; Li, Sheng; Gan, Weibing; Jiang, Ru
• Is Part Of: Measurement. Volume 172(2021)
• Publication Date: 2021-02
• Subjects: Pipeline monitoring -- Source lateral positioning -- Fiber optic cable -- Ultra-weak fiber Bragg grating -- Positioning algorithm; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2020.108892
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Positioning the lateral location of source for underground pipeline helps to reduce the false alarm rate. Double optical cable system based on UWFBG sensing array is deployed. Scanning-based positioning algorithm achieves relatively high precision. The method is suitable for strong heterogeneity of medium in short range. Abstract: Monitoring the underground pipeline to prevent the illegal intrusion is a quite important work for civil infrastructure security management. The distributed fiber optic sensing technology nowadays has been widely used in the monitoring. Meanwhile, it also suffers from a relatively high false alarm rate. To tackle the difficult problem of false alarms, the paper develops a short range lateral positioning method of vibration source based on ultra-weak fiber Bragg grating vibration sensing array. Two parallel fiber optic cables are required to be deployed at the both sides of the pipeline. The positioning algorithm establishes a least square misfit function between the predicted and observed travel time difference based on the double-cable data. By systematically searching through the possible lateral distance in a selected range, an optimal distance can be identified according to the minimal misfit value. The tests on synthetic and field data validate the effectiveness of the proposed method.