Synthetic Spectrum Approach for Brillouin Optical Time-Domain Reflectometry

Sensors

Ken'ichi Nishiguchi²  Che-Hsien Li¹  Artur Guzik¹ 

[1] Neubrex Co., Ltd., Sakaemachi-dori 1-1-24, Kobe 650-0023, Japan; E-Mails:;Office for University-Industry Collaboration, Osaka University, Yamadaoka 2-8, Osaka 565-0871, Japan

关键词: Brillouin scattering;    distributed sensor;    optical fiber sensor;    optical time-domain reflectometry (OTDR);    strain measurement;    synthetic spectrum;    temperature measurement;   

DOI  :  10.3390/s140304731

来源: mdpi

【 摘 要 】

We propose a novel method to improve the spatial resolution of Brillouin optical time-domain reflectometry (BOTDR), referred to as synthetic BOTDR (S-BOTDR), and experimentally verify the resolution improvements. Due to the uncertainty relation between position and frequency, the spatial resolution of a conventional BOTDR system has been limited to about one meter. In S-BOTDR, a synthetic spectrum is obtained by combining four Brillouin spectrums measured with different composite pump lights and different composite low-pass filters. We mathematically show that the resolution limit, in principle, for conventional BOTDR can be surpassed by S-BOTDR and experimentally prove that S-BOTDR attained a 10-cm spatial resolution. To the best of our knowledge, this has never been achieved or reported.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.