A modal interferometer based on single mode fiber-hollow core fiber-single mode fiber structure filled with alcohol and magnetic fluid for simultaneously measuring magnetic field and temperature

Zhao Yong; Cai Lu; Li Xue-Gang; Lü Ri-Qing

doi:10.7498/aps.66.070601

Abstract

In many fields, such as aerospace and marine environmental monitoring, magnetic field measurement is an important link. In recent years, optical fiber magnetic field sensor has received much attention because of its advantages such as small size, electromagnetic immunity, resistance to erosion and capability of remote sensing. In that case, magnetic fluid as a kind of medium between photons and magnetic field is widely used in optical fiber magnetic field sensors. Moreover, in the process of magnetic field measurement, disturbance introduced by temperature fluctuation always happens and brings uncertainty to the sensor. Temperature is also an important parameter in production process and needs to be measured. Therefore, designing a high-sensitive optical fiber sensor for simultaneously measuring magnetic field and temperature is a valuable work. In this paper, we present a high-sensitive hollow core fiber (HCF) interferometer for simultaneously measuring magnetic field and temperature. A segment of HCF filled with alcohol is inserted into single mode fiber (SMF) with 50 m offset at two splicing joints to guide light into the wall of HCF. And then this SMF-HCF-SMF structure is packaged by a capillary tube with full magnetic fluid (MF) inside it. Since the modal field area is large enough, the silica wall can support a series of guiding modes among which modal interference occurs and the interference spectrum can be recorded by an optical spectrum analyzer. Besides thermo-optic effect and thermal expansion effect of silica itself, the RI variations caused by thermo-optic effect of alcohol and MF as well as the magneto-optic effect of MF can also cause the phase difference of the guiding modes to change, thereby rendering interference dips movable. Thus, the sensitivity of temperature or magnetic field is higher than those given in some other previous studies. In addition, it is calculated that the effective RI sensitivities of guiding modes for inside and outside liquid are different because of the peculiar non-circular symmetry structure of HCF. So there is a possibility to find two dips in interference spectrum, which are formed with different modes and have various sensitivities to the variations of temperature and magnetic field. Finally, a sensitivity matrix can be built to demodulate those two parameters simultaneously. Experimental results show that within 20-58℃, the temperature sensitivities are 112 pm/℃ and 468 pm/℃ for dip1 and dip 2 whose magnetic field sensitivities are 37 pm/Oe and 82 pm/Oe within 0-169 Oe, respectively. The proposed sensor possesses high sensitivity and good mechanical strength, and can effectively eliminate the cross disturbances between temperature and magnetic field.

Keywords:

Authors and contacts

1.
School of Information Science and Engineering, Northeastern University, Shenyang 110819, China;
2.
State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China

Corresponding author: Zhao Yong, zhaoyong@ise.neu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China(Grant Nos. 61425003, 61273059, 51607028).

References

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[24]	Nguyen L V, Hwang D, Moon S, Moon D S, Chung Y 2008Opt. Express 16 15
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Cited By

[1]	Zhao Y, Hu T 2010Sensors and Detection Technology (Beijing:China Machine Press) p106(in Chinese)[赵勇, 胡涛2010传感器与检测技术(北京:机械工业出版社)第106页]
[2]	Zhao Y, L R Q, Wang D, Wang Q 2015IEEE Photon. Techn. Lett. 27 1
[3]	Layeghi A, Latifi H, Frazao O 2014 IEEE Photon. Technol. Lett. 2619
[4]	Zhao Y, Wu D, L R Q 2015 IEEE Photon. Techn. Lett. 271
[5]	Lin W, Miao Y, Zhang H, Liu B, Liu Y, Song B 2015IEEE Photon. Techn. Lett. 27 4
[6]	Tripathi S M, Kumar A, Varshney R K, Kumar Y B P, Marin E, Meunier J P 2009 J. Lightwave Technol. 2713
[7]	Li E, Wang X, Zhang C 2006 Appl. Phys. Lett. 899
[8]	Wu Q, Semenova Y, Wang P, Farrell G 2011 Opt. Express 199
[9]	Liu Y, Liu Z, Chen S, Han M 2015 IEEE Photon. Techn. Lett. 274
[10]	Yang R, Yu Y S, Chen C, Xue Y, Zhang X, Guo J, Wang C, Zhu F, Zhang B, Chen Q, Sun H 2013Opt. Lett. 38 19
[11]	Wang H, Pu S, Wang N, Dong S, Huang J 2013 Opt. Lett. 3819
[12]	Dong S, Pu S, Wang H 2014IEEE Photon. Technol. Lett. 26 22
[13]	Song B, Miao Y, Lin W, Zhang H, Liu B, Wu J, Liu H, Yan D 2014 IEEE Photon. Technol. Lett. 2622
[14]	Liu T, Chen Y, Han Q, Lu X 2014IEEE Photon. J. 6 6
[15]	Zhao Z, Tang M, Gao F, Zhang P, Duan L, Zhu B, Fu S, Ouyang J, Wei H, Li J, Shum P P, Liu D 2014Opt. Express 22 22
[16]	Wu J, Miao Y, Song B, Lin W, Zhang H, Zhang K, Liu B, Yao J 2014Appl. Phys. Lett. 104 25
[17]	Zu P, Chan C C, Wen S L, Hu L, Jin Y, Liew H F, Chen L H, Wong W C, Dong X 2012IEEE Photon. J. 4 2
[18]	Dong S, Pu S, Huang J 2013Appl. Phys. Lett. 103 11
[19]	Pu S, Dong S 2014IEEE Photon. J. 6 4
[20]	Deng M, Liu D, Li D 2014Sens. Actuat. A:Phys. 211 5
[21]	Miao Y, Wu J, Lin W, Song B, Zhang H, Zhang K, Liu B, Yao J 2014J. Lightwave Technol. 32 23
[22]	Li L, Li X, Xie Z, Liu D 2012Opt. Express 20 10
[23]	Geng Y, Li X, Tan X, Deng Y, Yu Y 2011IEEE Sens. J. 11 11
[24]	Nguyen L V, Hwang D, Moon S, Moon D S, Chung Y 2008Opt. Express 16 15
[25]	Zhao Y, Cai L, Li X G 2015IEEE Photon. Technol. Lett. 27 12
[26]	Coelho L, Frazo O, Kobelke J, Schuster K, Santos J L 2011Opt. Eng. 50 10
[27]	Zhao Y, Wu D, Lv R Q, Ying Y 2014IEEE Trans. Magn. 50 8

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Vol. 66, Issue 7 - 2017-04-05

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