Journal
SENSORS
Volume 22, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/s22124480
Keywords
liquid level; fiber sensor; optical frequency domain reflectometry; no-core fiber; distributed sensing
Funding
- National Natural Science Foundation of China [61975022]
- Chongqing Talents: Exceptional Young Talents Project [CQYC202005011]
- National Science Fund for Distinguished Young Scholars [61825501]
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A distributed liquid-level sensor based on optical frequency domain reflectometry and no-core fiber is proposed in this study. The experimental results show that the method can achieve high resolution, good stability, large measurement range, and high signal-to-noise ratio, making it suitable for intelligent industry and extreme environments.
Liquid-level sensors are required in modern industrial and medical fields. Optical liquid-level sensors can solve the safety problems of traditional electrical sensors, which have attracted extensive attention in both academia and industry. We propose a distributed liquid-level sensor based on optical frequency domain reflectometry and with no-core fiber. The sensing mechanism uses optical frequency domain reflectometry to capture the strong reflection of the evanescent field of the no-core fiber at the liquid-air interface. The experimental results show that the proposed method can achieve a high resolution of 0.1 mm, stability of +/- 15 mu m, a relatively large measurement range of 175 mm, and a high signal-to-noise ratio of 30 dB. The sensing length can be extended to 1.25 m with a weakened signal-to-noise ratio of 10 dB. The proposed method has broad development prospects in the field of intelligent industry and extreme environments.
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