7 November 2012 Resolution enhancement in Brillouin optical correlation domain analysis by differential lock-in detection
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 8421BB (2012); doi: 10.1117/12.974973
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
Abstract
We newly propose and experimentally demonstrate a differential lock-in detection scheme for the enhancement of Brillouin optical correlation domain analysis (BOCDA), where additional phase modulation is applied to the Brillouin pump wave and the on-off control on which is used for data acquisition. The theoretical model and the experimental results show that at least three-fold improvement is obtained in the spatial resolution of the distributed measurements and the Brillouin gain spectrum (BGS) with much narrower 3dB bandwidth than that of conventional BOCDA systems is acquired by the differential lock-in detection.
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Ji Ho Jeong, Kwanil Lee, Kwang Yong Song, Je-Myung Jeong, Sang Bae Lee, "Resolution enhancement in Brillouin optical correlation domain analysis by differential lock-in detection", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 8421BB (7 November 2012); doi: 10.1117/12.974973; https://doi.org/10.1117/12.974973
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KEYWORDS
Spatial resolution

Phase modulation

Modulation

Resolution enhancement technologies

Signal detection

Data acquisition

Fiber optics sensors

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