Journal
OPTICS EXPRESS
Volume 26, Issue 17, Pages 21656-21663Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.021656
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Funding
- National Natural Science Foundation of China [61605170]
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A novel optical fiber liquid level sensor based on a hollow core Bragg fiber (HCBF) was proposed and demonstrated. The HCBF was first designed and successfully fabricated with periodic transmission band in the spectrum and a transmission loss of similar to 3.48 dB/cm. An inline optical fiber liquid-level sensor was fabricated by simply sandwiching a piece of HCBF between two single mode fibers. The sensing performance was experimentally tested. A linear liquid-level sensitivity of similar to 1.1 dB/mm, and fast response time less than 3s was obtained by the intensity demodulation measurement. The temperature and refractive index cross-sensitivities were also investigated. The experimental results indicate that our proposed structure has tiny temperature and RI dependence, which makes it a promising liquid level sensing platform for different liquids. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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