期刊
SENSORS
卷 14, 期 3, 页码 4731-4754出版社
MDPI
DOI: 10.3390/s140304731
关键词
Brillouin scattering; distributed sensor; optical fiber sensor; optical time-domain reflectometry (OTDR); strain measurement; synthetic spectrum; temperature measurement
资金
- Japan Oil, Gas and Metals National Corporation (JOGMEC)
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.
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