Ryu, Gukbeen Kim, Gyu-Tae Song, Kwang Yong Lee, Sang Bae Lee, Kwanil 2024-01-20T00:00:33Z 2024-01-20T00:00:33Z 2021-09-03 2017-12-15 0733-8724 https://pubs.kist.re.kr/handle/201004/121915 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. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC DIFFERENTIAL MEASUREMENT MEASUREMENT RANGE FIBER SENSOR SCHEME ENLARGEMENT SYSTEM Brillouin Optical Correlation Domain Analysis Enhanced by Time-Domain Data Processing for Concurrent Interrogation of Multiple Sensing Points Article 10.1109/JLT.2017.2750174 1 JOURNAL OF LIGHTWAVE TECHNOLOGY, v.35, no.24, pp.5311 - 5316 JOURNAL OF LIGHTWAVE TECHNOLOGY 35 24 5311 5316 scie scopus 000418769500007 2-s2.0-85040316892 Engineering, Electrical & Electronic Optics Telecommunications Engineering Optics Telecommunications Article DIFFERENTIAL MEASUREMENT MEASUREMENT RANGE FIBER SENSOR SCHEME ENLARGEMENT SYSTEM Optical fiber sensors stimulated Brillouin scattering time domain analysis