scholarly journals An Optical Fiber Liquid Level Sensor Based on Side Coupling Induction Technology

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Yanjun Zhang ◽  
Yingzi Zhang ◽  
Yulong Hou ◽  
Liang Zhang ◽  
Yanjun Hu ◽  
...  

An optical fiber liquid level sensor based on two twisted polymer optical fibers twining around a racetrack column is demonstrated in this study. The side-coupling power of the passive fiber is modulated by the refractive index (RI) of the environment medium and decreases while the liquid level increases. The variation patterns of the side-coupling power in the bent section and the straight section form a step attenuation, which can improve the measurement range with a superior sensitivity and distinguish liquids with different RIs. Furthermore, the cost-effective sensor also shows good reversibility and low temperature-dependent properties.

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Yingzi Zhang ◽  
Yulong Hou ◽  
Yanjun Zhang ◽  
Liang Zhang ◽  
Yanjun Hu ◽  
...  

A multipoint liquid level sensor based on the RI modulation of macrobend polymer optical fiber (POF) couplers is proposed. By twinning two twisted POFs around a race-track column, a series of U-shaped sensing heads are achieved. The output power in the passive fiber declines in a step form while the sensing heads are immersed into liquid in turn. The introduction of UV optical cement in the gap between two POFs improves the side-coupling ratio, increasing the attenuation per step. For the measurement range of 100 cm, the resolution is 2 cm. The sensor can differentiate different liquids with low temperature dependence.


Sensor Review ◽  
2019 ◽  
Vol 39 (4) ◽  
pp. 522-524 ◽  
Author(s):  
Ning Jing

Purpose This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber. Design/methodology/approach The principle of liquid sensing used is based on the leakage of higher modes out of the fiber and repeated regeneration in the following bend sections. Therefore, a propagation loss was introduced in every bend section of the fiber with the loss depending on the refractive index of the environment. Findings Therefore, a continue shift in the liquid level can be detected by observing changes in the propagation loss of the fiber. The sensor features compactness and a flexible resolution. Originality/value Compared with the exited ones, the sensor has capability of continue liquid measurement and a greater measurement range.


Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3111 ◽  
Author(s):  
Chuanxin Teng ◽  
Houquan Liu ◽  
Hongchang Deng ◽  
Shijie Deng ◽  
Hongyan Yang ◽  
...  

A high sensitivity and easily fabricated liquid level sensor based on the V-groove structure plastic optical fiber (POF) was described. In the design, the V-groove structure on the POF is produced by using a die-press-print method, which effectively reduces the complexity of the fabrication process and makes it easier for mass production of liquid level sensors. This greatly enhances the usefulness of the proposed sensor in cost effective liquid level sensing applications. The transmission characteristic of the POF could be changed when the V-groove structure was immerged or emerged by the rising or falling liquid. The liquid level sensing performances for the sensor probes with different structural parameters were investigated, and the sensor performances for the liquids with different refractive indices and the sensor dynamic response were also tested. Experimental results show that the sensor’s sensitivity can reach 0.0698 mm−1, with a resolution of 2.5 mm. Results also show that the sensor has a fast response time of 920 ms.


2005 ◽  
Author(s):  
Sergei N. Khotiaintsev ◽  
Katya Romo-Medrano ◽  
Vladimir A. Svirid

2016 ◽  
Vol 6 (4) ◽  
pp. 312-317 ◽  
Author(s):  
Yulong Hou ◽  
Wenyi Liu ◽  
Huixin Zhang ◽  
Shan Su ◽  
Jia Liu ◽  
...  

2014 ◽  
Vol 26 (16) ◽  
pp. 1613-1616 ◽  
Author(s):  
Xiao Lin ◽  
Yulin Li ◽  
Liyong Ren ◽  
Yiping Xu ◽  
Nana Chen ◽  
...  

2013 ◽  
Vol 52 (1) ◽  
pp. 014402 ◽  
Author(s):  
Chengrui Zhao ◽  
Lin Ye ◽  
Junfeng Ge ◽  
Jianhong Zou ◽  
Xun Yu

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