| Paper Abstract and Keywords |
| Presentation |
2023-11-10 10:35
High-accuracy distributed strain sensing based on low-coherence BOCDR: simulation and experimental validation
Kenta Otsubo, Guangtao Zhu, Takaki Kiyozumi (YNU), Hiroshi Takahashi (YNU/NTT), Yusuke Koshikiya (NTT), Yosuke Mizuno (YNU) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
As a principle of distributed measurement of strain and temperature along an optical fiber, the strain/temperature dependencies of the frequency shift accompanied by Brillouin scattering have been widely utilized. Among various methods already reported, a correlation-domain method has advantages such as random accessibility and relatively high spatial resolution compared to other distributed measurement methods. However, in the method of directly modulating the laser frequency with sinusoidal waves, the amplitude modulation is inevitably accompanied, and the phase difference between amplitude modulation and frequency modulation, called AM-FM phase delay, deteriorates the precision of distributed strain/temperature measurement. In this work, we demonstrate from both simulation and experimental aspects that this effect can be mitigated using low-coherence Brillouin optical correlation-domain reflectometry (LC-BOCDR) based on periodic noise modulation. We investigate the characteristics of signal light modulated by periodic noise modulation and demonstrate through high-precision distributed strain measurements that this method will be an innovative technique with several advantages compared to standard sinusoidal-modulation BOCDR. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
Optical fiber sensors / Brillouin optical correlation-domain reflectometry / low coherence / noise modulation / / / / |
| Reference Info. |
ITE Tech. Rep. |
| Paper # |
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| Date of Issue |
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| ISSN |
Online edition: ISSN 2424-1970 |
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