2016-Coherent Φ-OTDR based on I/Q demodulation and homodyne detection

2018-12-07 Hits:

Teaching and Research Group:光纤传感与器件

Journal:Optics Express

Key Words:Fiber optics;Fiber optics sensors; Scattering Rayleigh

Abstract:We demonstrate a novel distributed acoustic sensing (DAS) system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR). Both the phase and the amplitude of the Rayleigh scattering (RS) light can be demodulated in real-time. The technique is based on I/Q demodulation and homodyne detection using a 90° optical hybrid. The theoretical analysis is given, and as a proof of the concept, the dynamic strain sensing is experimentally demonstrated, with a sensing range of 12.566 km and a spatial resolution of 10 m.

All the Authors:Yunjiang Rao, Jiarui Rao, Xianyang Qian, Wei Sun, Mengqiu Fan, Fei Peng, Naitian Xue, Song Wang, Li Zhang,Zinan Wang

First Author:Zinan Wang

Indexed by:Unit Twenty Basic Research

Correspondence Author:Zinan Wang

Discipline:Engineering

First-Level Discipline:Optical engineering

Volume:24

Issue:2

Page Number:853-858

Translation or Not:no

Date of Publication:2016-01-25

Date of Publication:2016-01-25