Brillouin optical correlation domain reflectometry with lock-in detection scheme

被引：12
|
作者：
Yao, Yuguo [1 ]
Kishi, Masato [1 ]
Hotate, Kazuo [1 ]
机构：
[1] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, Tokyo 1138656, Japan
来源：
APPLIED PHYSICS EXPRESS | 2016年 / 9卷 / 07期
关键词：
MEASUREMENT RANGE ENLARGEMENT; STRAIN-MEASUREMENT; FIBER; SCATTERING; MODULATION; PROPOSAL;
D O I：
10.7567/APEX.9.072501
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We propose a Brillouin optical correlation domain reflectometry (BOCDR) technique with a lock-in detection scheme in this paper. By designing a new system using the lock-in detection scheme and amplifying a small spontaneous Brillouin signal with a lock-in amplifier, a Brillouin scattering spectrum with a stable shape is obtained. By further introducing a periodical on/off phase modulation for chopping for lock-in detection, the undesired optical background spectrum is effectively reduced, and a 20 cm section with 7,000 mu epsilon strain is clearly measured. (C) 2016 The Japan Society of Applied Physics
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页数：4
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