Micro-structured optical fiber magnetic field sensor based on magnetic fluid filling

A novel micro-structured fiber magnetic field sensor based on magnetic fluid (MF) filling is proposed. The air hole radius in the cladding of fiber is reduced from inner layer to outer layer, and the numerical analysis is performed by the finite element method (FEM). For the [Formula: see text]-pol mode, the proposed sensor has an average sensitivity of 960.61 pm/Oe, and for the [Formula: see text]-pol mode, the average sensitivity can reach 884.85 pm/Oe. The sensor has the advantages of small size and high sensitivity and is competitive in magnetic field sensors.

Download Full-text

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

Applied Sciences ◽

10.3390/app112311569 ◽

2021 ◽

Vol 11 (23) ◽

pp. 11569

Author(s):

Maoqing Chen ◽

Qifeng Liu ◽

Yong Zhao

Keyword(s):

Magnetic Field ◽

Optical Fiber ◽

Magnetic Fluid ◽

Light Transmission ◽

Magnetic Field Sensor ◽

Magnetic Field Measurement ◽

Term Operation ◽

The Core ◽

Field Sensor ◽

Air Hole

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.

Download Full-text

High sensitivity magnetic field sensor based on a Mach-Zehnder interferometer and magnetic fluid

Optik ◽

10.1016/j.ijleo.2021.168234 ◽

2021 ◽

pp. 168234

Author(s):

Li Zeng ◽

Xiaoyan Sun ◽

Limu Zhang ◽

Youwang Hu ◽

Ji’an Duan

Keyword(s):

Magnetic Field ◽

Magnetic Fluid ◽

High Sensitivity ◽

Magnetic Field Sensor ◽

Zehnder Interferometer ◽

Field Sensor ◽

Mach Zehnder Interferometer

Download Full-text

A Highly Sensitive Intensity-Modulated Optical Fiber Magnetic Field Sensor Based on the Magnetic Fluid and Multimode Interference

Journal of Sensors ◽

10.1155/2017/9573061 ◽

2017 ◽

Vol 2017 ◽

pp. 1-7 ◽

Cited By ~ 4

Author(s):

Yi Huang ◽

Tingyun Wang ◽

Chuanlu Deng ◽

Xiaobei Zhang ◽

Fufei Pang ◽

...

Keyword(s):

Magnetic Field ◽

Optical Fiber ◽

Magnetic Fluid ◽

High Sensitivity ◽

Single Mode ◽

Magnetic Field Sensor ◽

Modulation Method ◽

High Modulation ◽

Compact Size ◽

Field Sensor

Fiber-optic magnetic field sensing is an important method of magnetic field monitoring, which is essential for the safety of civil infrastructures, especially for power plant. We theoretically and experimentally demonstrated an optical fiber magnetic field sensor based on a single-mode-multimode-single-mode (SMS) structure immersed into the magnetic fluid (MF). The length of multimode section fiber is determined based on the self-image effect through the simulation. Due to variation characteristics of the refractive index and absorption coefficient of MF under different magnetic fields, an effective method to improve the sensitivity of SMS fiber structure is realized based on the intensity modulation method. This sensor shows a high sensitivity up to 0.097 dB/Oe and a high modulation depth up to 78% in a relatively linear range, for the no-core fiber (NCF) with the diameter of 125 μm and length of 59.8 mm as the multimode section. This optical fiber sensor possesses advantages of low cost, ease of fabrication, high sensitivity, simple structure, and compact size, with great potential applications in measuring the magnetic field.

Download Full-text

Magnetic Field Sensor Based on a Tri-Microfiber Coupler Ring in Magnetic Fluid and a Fiber Bragg Grating

Sensors ◽

10.3390/s19235100 ◽

2019 ◽

Vol 19 (23) ◽

pp. 5100 ◽

Cited By ~ 1

Author(s):

Wei ◽

Liu ◽

Mallik ◽

Farrel ◽

Wu ◽

...

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Fiber Bragg Grating ◽

Magnetic Fluid ◽

High Sensitivity ◽

Spectral Shift ◽

Magnetic Field Sensor ◽

Bragg Grating ◽

Low Field ◽

Field Sensor

In this paper we propose and investigate a novel magnetic field sensor based on a Tri-microfiber coupler combined with magnetic fluid and a fiber Bragg grating (FBG) in a ring. A sensitivity of 1306 pm/mT was experimentally demonstrated in the range of magnetic fields from 0 to 15 mT. The reflection peak in the output spectrum associated with the FBG serves as a reference point allowing to avoid ambiguity in determining the spectral shift induced by the magnetic field. Due to its high sensitivity at low magnetic fields, the proposed structure could be of high interest in low field biosensing applications that involve a magnetic field, such as magnetic manipulation or separation of biomolecules.

Download Full-text

Magnetic-field sensor with self-reference characteristic based on a magnetic fluid and independent plasmonic dual resonances

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.10.23 ◽

2019 ◽

Vol 10 ◽

pp. 247-255 ◽

Cited By ~ 9

Author(s):

Kun Ren ◽

Xiaobin Ren ◽

Yumeng He ◽

Qun Han

Keyword(s):

Magnetic Field ◽

Refractive Index ◽

Magnetic Fluid ◽

High Sensitivity ◽

Magnetic Sensors ◽

Magnetic Field Sensor ◽

Plasmonic Waveguides ◽

Coupled Mode ◽

Field Sensor ◽

Self Reference

A magnetic-field sensor with self-reference characteristic based on metal–dielectric–metal (MDM) plasmonic waveguides and a magnetic fluid (MF) is proposed and theoretically investigated. Independent dual resonances are supported by the coupled resonator–waveguide system. The physical mechanisms of dual resonances are analyzed by the temporal coupled-mode theory. The transmission response to an external magnetic field is explored by using the remarkable tunability of the refractive index of the MF. Based on the different dependence of two resonances on the external field, a magnetic-field sensor with self-reference characteristic is achieved. The magnetic-field nanosensor shows an excellent performance with a high sensitivity of 27 pm/Oe, i.e., 270 pm/mT. The proposed sensor takes advantage of the refractive-index tunability of the MF and the compactness of the MDM waveguide structure. This research may open new opportunities to design nanoscale magnetic sensors with good performance.

Download Full-text