Liquid-level sensing method based on differential pulse-width pair Brillouin optical time-domain analysis and a self-heated high attenuation fiber

被引：6
作者：
Zhang, Hongying [1 ]
Cheng, Yifu [1 ]
Wu, Kaiji [1 ]
Yuan, Zhijun [1 ]
Dong, Yongkang [2 ]
机构：
[1] Harbin Univ Sci & Technol, Sch Sci, Heilongjiang Prov Key Lab Quantum Manipulat & Con, Harbin 150080, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Sci & Technol Tunable Laser, Harbin 150001, Peoples R China
来源：
APPLIED OPTICS | 2020年 / 59卷 / 03期
基金：
中国国家自然科学基金;
关键词：
SPATIAL-RESOLUTION; SCATTERING; LIGHT;
D O I：
10.1364/AO.382725
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A liquid-level sensing method based on differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA) combining with a self-heated high attenuation fiber (HAF) is proposed, where the principle is to locate the temperature abruption position at the interface between liquid and air caused by their different thermal diffusion rates. A Panda polarization-maintaining fiber is used as the sensing optical fiber, which is tightly glued alongside a laser-powered HAF. Heated by a high-power laser, the temperature of the HAF can increase and exhibits approximately exponential attenuation with the light propagation direction, which induces a similar temperature distribution over the sensing fiber. By using a 5-cm spatial resolution DPP-BOTDA and a 1.4-W heating light, temperature distributions of the sensing fiber are measured for different water levels, and the results indicate that distributed liquid-level sensing with a range of 20 cm and a resolution of 1 cm is realized using our method. (C) 2020 Optical Society of America
引用
收藏
页码：795 / 799
页数：5
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