US 11,054,302 B2
Event positioning method, device and application in distributed fiber vibration monitoring system
Ying Shang, Ji'nan (CN); Chen Wang, Ji'nan (CN); Chang Wang, Ji'nan (CN); Jiasheng Ni, Ji'nan (CN); Chang Li, Ji'nan (CN); Wenan Zhao, Ji'nan (CN); Bing Cao, Ji'nan (CN); Sheng Huang, Ji'nan (CN); Xiaohui Liu, Ji'nan (CN); and Yingying Wang, Ji'nan (CN)
Assigned to Laser Institute of Shandong Academy of Science, Jining (CN)
Filed by Laser Institute of Shandong Academy of Science, Jining (CN)
Filed on Jun. 17, 2019, as Appl. No. 16/443,397.
Claims priority of application No. 201910389122.7 (CN), filed on May 10, 2019.
Prior Publication US 2020/0355547 A1, Nov. 12, 2020
Int. Cl. G01H 9/00 (2006.01)
CPC G01H 9/004 (2013.01) 7 Claims
OG exemplary drawing
 
1. An event positioning method in a distributed fiber vibration monitoring system, which is applied to the distributed fiber vibration monitoring system based on Rayleigh scattering, wherein the method comprises:
obtaining respective interference field signals corresponding to backward Rayleigh scattering lights that are generated when a pulse light is transmitted in a sensing fiber in the distributed fiber vibration monitoring system;
comparing optical powers of the respective interference field signals to obtain an interference field signal having a maximum optical power;
calculating a sensing location at which the interference field signal having the maximum optical power is generated, according to a time when the interference field signal having the maximum optical power is received and a time when the pulse light is injected into the sensing fiber; and
determining, according to the sensing location and a spatial resolution of the distributed fiber vibration monitoring system calculated according to a pulse width of the pulse light, a location at which an event occurs in the sensing fiber.