23 April 2017 A liquid level sensing system based on high attenuation fiber and DPP-BOTDA
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103236R (2017) https://doi.org/10.1117/12.2263958
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
A novel liquid-level sensing system based on differential pulse-width pair Brillouin optical time domain analysis technology with a self-heated high attenuation fiber (HAF) is proposed and demonstrated in this paper, where the principle is to measure the temperature abruption position at the interface between liquid and air caused by the different thermal diffusion rates of the two kinds of mediums. The sensing optical fiber was glued to a 1-m HAF with an absorption coefficient of 20 dB/m, so that heat can be transmitted from the HAF to the sensing fiber through physical contact, which will cause temperature increase of the latter. The Brillouin frequency shift (BFS) profiles of the sensing fiber when the HAF was heated by different heating optical powers were characterized to find out the optimized heating power. The BFS distributions were measured for different water levels, with the result indicating that liquid-level sensing with a range of 20 cm and a resolution of 1 cm is realized.
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Hongying Zhang, Ziye Liu, Zhijun Yuan, Wei Gao, Yongkang Dong, "A liquid level sensing system based on high attenuation fiber and DPP-BOTDA", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103236R (23 April 2017); doi: 10.1117/12.2263958; https://doi.org/10.1117/12.2263958
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