Affiliation:
1. National Pipe Network Group, Chongqing Natural Gas Pipeline Co., Ltd.
Abstract
We propose and demonstrate a high-performance distributed dynamic absolute strain sensing technique by synthesizing φ-OTDR and BOTDR. The technique synthesizes the relative strain obtained by the φ-OTDR part and the initial strain offset estimated by fitting the relative strain with the absolute strain signal from the BOTDR part. As a result, it provides not only the characteristics of high sensing accuracy and high sampling rate like φ-OTDR, but also the absolute strain measurement and the large sensing dynamic range like BOTDR. The experiment results indicate the proposed technique can realize the distributed dynamic absolute strain sensing with a sensing dynamic range of over 2500 µɛ, a peak-to-peak amplitude of 1165 µɛ, and a wide frequency response range from 0.1 to over 30 Hz over a sensing range of about 1 km.
Funder
National Natural Science Foundation of China
National Science Fund for Distinguished Young Scholars
Chongqing Natural Science Foundation of Innovative Research Groups
Chongqing Natural Science Foundation of Postdoctoral Fellowship
Subject
Atomic and Molecular Physics, and Optics