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Article

All Fiber Mach–Zehnder Interferometer Based on Intracavity Micro-Waveguide for a Magnetic Field Sensor

by 1,2,*, 1,2 and 1,2,*
1
Hebei Key Laboratory Micro-Nano Precision Optical Sensing and Measurement Technology, Northeastern University, Qinhuangdao 066004, China
2
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Bernhard Wilhelm Roth
Appl. Sci. 2021, 11(23), 11569; https://doi.org/10.3390/app112311569
Received: 2 November 2021 / Revised: 25 November 2021 / Accepted: 3 December 2021 / Published: 6 December 2021
(This article belongs to the Special Issue State-of-the-Art Laser Measurement Technologies)
A magnetic fluid (MF)-based magnetic field sensor with a filling-splicing fiber structure is proposed. The sensor realizes Mach–Zehnder interference by an optical fiber cascade structure consisting of single mode fiber (SMF), multimode fiber (MMF), and single-hole-dual-core fiber (SHDCF). The core in the cladding and the core in the air hole of SHDCF are used as the reference and sensing light path, respectively, and the air hole of SHDCF is filled with magnetic fluid to realize magnetic field measurement based on magnetic controlled refractive index (RI) characteristics. The theoretical feasibility of the proposed sensing structure is verified by Rsoft simulation, the optimized length of SHDCF is determined by optical fiber light transmission experiment, and the SHDCFs are well fused without collapse through the special parameter setting. The results show that the sensitivity of the sensor is −116.1 pm/Gs under a magnetic field of 0~200 Gs with a good long-term operation stability. The proposed sensor has the advantages of high stability, fast response, simple structure, and low cost, which has development potential in the field of miniaturized magnetic field sensing. View Full-Text
Keywords: optical fiber sensor; magnetic field sensor; magnetic fluid; Mach–Zehnder interferometer optical fiber sensor; magnetic field sensor; magnetic fluid; Mach–Zehnder interferometer
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MDPI and ACS Style

Chen, M.; Liu, Q.; Zhao, Y. All Fiber Mach–Zehnder Interferometer Based on Intracavity Micro-Waveguide for a Magnetic Field Sensor. Appl. Sci. 2021, 11, 11569. https://doi.org/10.3390/app112311569

AMA Style

Chen M, Liu Q, Zhao Y. All Fiber Mach–Zehnder Interferometer Based on Intracavity Micro-Waveguide for a Magnetic Field Sensor. Applied Sciences. 2021; 11(23):11569. https://doi.org/10.3390/app112311569

Chicago/Turabian Style

Chen, Maoqing, Qifeng Liu, and Yong Zhao. 2021. "All Fiber Mach–Zehnder Interferometer Based on Intracavity Micro-Waveguide for a Magnetic Field Sensor" Applied Sciences 11, no. 23: 11569. https://doi.org/10.3390/app112311569

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