Time shifting deviation method enhanced laser interferometry: ultrahigh precision localizing of traffic vibration using a urban fiber link

作     者：Guan Wang Zhongwang Pang Bohan Zhang Pangmin Wang Yufeng Chen Hongfei Dai Bo Wang Lijun Wang GUAN WANG;ZHONGWANG PANG;BOHAN ZHANG;FANGMIN WANG;YUFENG CHEN;HONGFEI DAI;BO WANG;LIJUN WANG

作者机构：State Key Laboratory of Precision Measurement Technology and InstrumentsDepartment of Precision InstrumentTsinghua UniversityBeijing 100084China Key Laboratory of Photonic Control Technology(Tsinghua University)Ministry of EducationBeijing 100084China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2022年第10卷第8期

页      面：433-443页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 0703[理学-化学] 0714[理学-统计学（可授理学、经济学学位）] 0803[工学-光学工程] 0701[理学-数学] 0823[工学-交通运输工程] 

基　　金：National Natural Science Foundation of China(62171249 61971259 91836301) 

主　　题：fiber laser interferometer 

摘      要：Using a fiber network as a huge sensing system will enrich monitoring methods of public infrastructures and geological disasters. With the traditional cross-correlation method, a laser interferometer has been used to detect and localize the vibration event. However, the random error induced by the cross-correlation method limits the localization accuracy and makes it not suitable for ultrahigh precision localizing applications. We propose a novel time shifting deviation(TSDEV) method, which has advantages over the cross-correlation method in practicability and localization accuracy. Three experiments are carried out to demonstrate the novelty of the TSDEV method. In a lab test, vibration localization accuracy of;.5 m is realized. In field tests, TSDEV method enhanced interferometry is applied to monitor the urban fiber link. Traffic vibration events on the campus road and Beijing ring road have been precisely localized and analyzed, respectively. The proposed technique will extend the function of the existing urban fiber network, and better serve the future smart city.