基于马赫-曾德尔干涉仪的光纤扭转传感器
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摘要
提出一种基于马赫-曾德尔干涉仪的扭转传感器,通过实验进行了验证。干涉仪采用无芯光纤-七芯光纤-无芯光纤的结构,当七芯光纤发生扭转时,中心纤芯和外部纤芯的相位差发生变化,使得其透射光谱随之改变。实验结果表明,随着七芯光纤扭转角度的增加,输出光谱的下陷峰向短波长方向偏移,其传感敏感度为0.33nm/(°),角度最小测量精度为0.15°。所提光纤传感器具有成本低、构造简单、制作简便的优点,可以应用于涉及扭转、旋转等的角度测量领域。
A torsion sensor based on Mach-Zehnder interferometer is proposed and demonstrated experimentally.The interferometer is based on the no-core—7-core—no-core structure.When the 7-core fiber is twisted,the phase difference between the central core and the external core changes,which makes the transmission spectrum change accordingly.The results show that the spectra shift towards the short wavelength with the increase of the twist angle of the 7-core fiber.The sensitivity of torsion sensor is 0.33nm/(°),and the minimum measurement accuracy is 0.15°.This torsion sensor has the advantages of low cost,simple structure and simple fabrication.It can be applied to torsion angle or rotation angle measurement fields.
A torsion sensor based on Mach-Zehnder interferometer is proposed and demonstrated experimentally.The interferometer is based on the no-core—7-core—no-core structure.When the 7-core fiber is twisted,the phase difference between the central core and the external core changes,which makes the transmission spectrum change accordingly.The results show that the spectra shift towards the short wavelength with the increase of the twist angle of the 7-core fiber.The sensitivity of torsion sensor is 0.33nm/(°),and the minimum measurement accuracy is 0.15°.This torsion sensor has the advantages of low cost,simple structure and simple fabrication.It can be applied to torsion angle or rotation angle measurement fields.
引文
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[3]Yuan Libo,Dong Yongtao,et al.Loop topology based white light interferometric fiber optic sensor network for application of perimeter security[J].Photonic Sensors,2011,1(3):260—267.
[4]傅海威,闫旭,李辉栋,等.基于纤芯失配型马赫-曾德尔光纤折射率和温度同时测量传感器的研究[J].光学学报,2014,34(11):58—63.Fu Haiwei,Yan Xu,Li Huidong,et al.Study of fiber sensor for simultaneous measurement of refractive and temperature based on a Core-Mismatch Mach-Zehnder interferometer[J].Acta Optica Sinica,2014,34(11):58—63.
[5]Jiang Yinfeng,Wang Sumei,Jiang Lan,et al.Temperature-insensitive refractive index sensor based on Mach–Zehnder interferometer with two microcavities[J].Chinese Optics Letters,2017,15(2):25—29.
[6]Bai Zhiyong,Deng Mi,Liu Shen,et al.Torsion sensor with rotation direction discrimination based on a pre-twisted in-fiber Mach–Zehnder interferometer[J].IEEE Photonics Journal,2017,9(3):1—8.
[7]蒋友华,傅海威,丁继军,等.基于倏逝波的锥形光纤马赫-曾德尔湿度传感器[J].应用光学,2017,38(1):140—146.Jiang Youhua,Fu Haiwei,Ding Jijun et al.Tapered optical fiber Mach-Mehnder interferometer humidity sensor based on evanesce wave[J].Journal of Applied Optics,2017,38(1):140—146.
[8]Li Xia,Li Leching,Li Wei,et al.Novel optical fiber humidity sensor based on a no-core fiber structure[J].Sensors&Actuators A Physical,2013,190(1):1—5.
[9]Lei Ming,Zhang Yanan,Han Bo,et al.in-line Mach-Zehnder interferometer and FBG with smart hydrogel for simultaneous pH and temperature detection[J].IEEE Sensors Journal,2018,18(18):7499—7540.
[10]Luo Jianhua,Zhang Gui,Gu Yanran,et al.Sensing characteristics of in-line Mach-Zehnder interferometer based on magnetic fluid-filled multimode photonic crystal fiber[J].Microwave&Optical Technology Letters,2014,56(7):1721—1724.
[11]路艳芳,楼伟民,申屠锋营,等.基于马赫-曾德干涉的保偏光纤扭曲传感器研究[J].光电子·激光,2018,29(1):34—38.Lu Yanfang,LouWeimin,Shen Tufengying,et al.Polarization-dependent twist sensor based on fiber Mach-Zehnder interferometer[J].Journal of Optoelectronics@laser,2018,29(1):34—38.
[12]Zhao Yong,Xia Feng,Li Jin.Sensitivity-enhanced photonic crystal fiber refractive index sensor with two waist-broadened tapers[J].Journal of Lightwave Technology,2016,34(4):1373—1379.
[13]JoséRafael Guzmánsepúlveda,Rafael Guzmáncabrera,Torrescisneros M,et al.A highly sensitive fiber optic sensor based on Two-core fiber for refractive index measurement[J].Sensors,2013,13(10):14200—14213.
[14]Barrera D,Gasulla I,Sales S.Multipoint Two-dimensional curvature optical fiber sensor based on a nontwisted homogeneous Four-core Fiber[J].Journal of Lightwave Technology,2015,33(12):2445—2450.
[15]Li Chao,Ning Tigang,Li Jing,et al.Simultaneous measurement of refractive index,strain,and temperature based on a four-core fiber combined with a fiber Bragg grating[J].Optics&Laser Technology,2017,90(1):179—184.
[16]Wang Xiaoliang,Chen Daru,Li Haitao,et al.In-line MachZehnder interferometric sensor based on a seven-core optical fiber[J].IEEE Sensors Journal,2017,17(1):100—104.
[17]Ou Zhilong,Yu Yongqin,Yan Peiguang,et al.Ambient refractive index-independent bending vector sensor based on seven-core photonic crystal fiber using lateral offset splicing[J].Optics Express,2013,21(20):23812—23821.
[18]Zhu Tao,Wu Di,Deng Ming,et al.Refractive index sensing based on Mach-Zehnder interferometer formed by three cascaded Single-Mode fiber tapers[J].Applied optics,2011,50(11):1548—1553.