2 June 2014 High-performance in-line Brillouin optical correlation domain analysis
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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91575X (2014) https://doi.org/10.1117/12.2059168
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain
Abstract
We demonstrate a high-performance single-ended correlation-domain Brillouin sensor based on a phase modulation of Brillouin pump and a differential measurement scheme. Large DC noise induced by direct reflection of Brillouin pump was successfully removed by the phase modulation-based differential measurement as well as additional 4-fold enhancement in the spatial resolution. By applying an intentional loss to the end of a sensing fiber one of two correlation peaks within the fiber is suppressed, leading to double enlargement of the measurement range compared to former in-line reflector based systems. In the experimental confirmation a distributed strain measurement with a range of 100 m and a spatial resolution of 5 cm is presented.
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Ji Ho Jeong, Kwang Yong Song, Sang Bae Lee, Kwanil Lee, "High-performance in-line Brillouin optical correlation domain analysis", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91575X (2 June 2014); doi: 10.1117/12.2059168; https://doi.org/10.1117/12.2059168
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