Open AccessBrillouin optical correlation domain analysis with more than 1 million effective sensing points based on differential measurement
Author(s) -
Yong Hyun Kim,
Kwanil Lee,
Kwang Yong Song
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.033241
Subject(s) - optics , brillouin zone , modulation (music) , domain analysis , materials science , optical fiber , distributed acoustic sensing , brillouin scattering , time domain , phase modulation , image resolution , noise (video) , intensity modulation , fiber optic sensor , physics , phase noise , computer science , software construction , software , artificial intelligence , software system , acoustics , image (mathematics) , computer vision , programming language
Large increase of effective sensing points in Brillouin optical correlation domain analysis (BOCDA) is achieved by simultaneously applying double modulation and optical time gate based on differential measurement scheme. The noise substructure of Brillouin gain spectrum induced by the double modulation is effectively suppressed by the differential measurement, leading to 2,000 times enlargement of the measurement range. Distributed strain and temperature sensing along a 10.5 km fiber with spatial resolution of less than 1 cm is experimentally demonstrated which corresponds to over 1 million effective sensing points.