Brillouin Optical Correlation Domain Analysis Enhanced by Time-Domain Data Processing for Concurrent Interrogation of Multiple Sensing Points
- Authors
- Ryu, Gukbeen; Kim, Gyu-Tae; Song, Kwang Yong; Lee, Sang Bae; Lee, Kwanil
- Issue Date
- 15-12월-2017
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Optical fiber sensors; stimulated Brillouin scattering; time domain analysis
- Citation
- JOURNAL OF LIGHTWAVE TECHNOLOGY, v.35, no.24, pp.5311 - 5316
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF LIGHTWAVE TECHNOLOGY
- Volume
- 35
- Number
- 24
- Start Page
- 5311
- End Page
- 5316
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/81167
- DOI
- 10.1109/JLT.2017.2750174
- ISSN
- 0733-8724
- Abstract
- We propose and experimentally demonstrate a Brillouin optical correlation domain analysis system adopting time-domain data processing and differential measurement for simultaneous interrogation of multiple sensing points. Continuous probe and pulsed pump waves are simultaneously frequency-modulated by a MHz-order sinusoidal RF wave so that multiple correlation peaks are sequentially generated according to the propagation of the pump along a fiber under test (FUT). The Brillouin gain spectrum of each correlation peak is obtained and interrogated by moving window averaging of the probe wave with a span of the period of the RF modulation, leading to the simultaneous monitoring of the multiple sensing points. In experiments, 148 correlation peaks are concurrently interrogated with a spatial resolution less than 3 cm along a 1530 m FUT.
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