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

2019 ◽  
Vol 10 ◽  
pp. 247-255 ◽  
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.

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

2019 ◽  
Vol 33 (31) ◽  
pp. 1950380
Author(s):  
Jie Wang ◽  
Zhen Zhang ◽  
Shuguang Li ◽  
Shun Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
High Sensitivity ◽  
Magnetic Field Sensor ◽  
The Finite Element Method ◽  
Average Sensitivity ◽  
Magnetic Field Sensors ◽  
Hole Radius ◽  
Field Sensor ◽  
Air Hole

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.

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

Optik ◽  
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

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

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
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.

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

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5100 ◽  
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.

scholarly journals A Magnetic Field SPR Sensor Based on Temperature Self-Reference

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6130
Author(s):  
Xinwei Mo ◽  
Jiangtao Lv ◽  
Qiang Liu ◽  
Xiaoxiao Jiang ◽  
Guangyuan Si
Keyword(s):  
Magnetic Field ◽  
Refractive Index ◽  
Magnetic Fluid ◽  
Resonance Theory ◽  
Crystal Fiber ◽  
Field Sensitivity ◽  
Sensitivity Problem ◽  
Field Sensor ◽  
Self Reference ◽  
The Magnetic Field

In this paper, a novel D-shaped photonic crystal fiber sensor for simultaneous measurements of magnetic field and temperature is proposed and characterized. Based on the surface plasmon resonance theory, the D-shaped flat surface coated with a gold layer is in direct contact with magnetic fluid to detect magnetic field, and one of the relatively small air holes near the fiber core is filled with polydimethylsiloxane (PDMS) to sense temperature. The realization of measuring the magnetic field and temperature separately through two channels depends on the fact that the magnetic field only changes the refractive index of the magnetic fluid, but has no effect on the refractive index of PDMS. The refractive index of the magnetic fluid and PDMS can be affected by temperature at the same time. The sensor designed in this work can separate the variations of the magnetic field and temperature simultaneously, therefore solving the cross-sensitivity problem to further improve the magnetic field sensitivity. When the thickness of the gold film is 50 nm and the radius of the filling hole is 0.52 µm, the magnetic field sensitivity and the temperature sensitivity of magnetic field sensor based on temperature self-reference can reach 0.14274 nm/Oe and −0.229 nm/°C, respectively.

High-sensitivity fiber optic magnetic field sensor based on lossy mode resonance and hollow core-offset structure

2021 ◽  
pp. 1-12
Author(s):  
Xue-Peng Jin ◽  
Hong-Zhi Sun ◽  
Shuo-Wei Jin ◽  
Wan-Ming Zhao ◽  
Jing-Ren Tang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Magnetic Field Sensor ◽  
Hollow Core ◽  
Field Sensor

Fiber loop ring-down magnetic field sensor using frequency-shifted interferometry and D-shaped fiber coated with magnetic fluid

2021 ◽  
pp. 1-1
Author(s):  
Chunfu Cheng ◽  
Jiaxuan Chen ◽  
Yiwen Ou ◽  
Wenjia Chen ◽  
Li Fang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Magnetic Field Sensor ◽  
Field Sensor ◽  
Loop Ring ◽  
Fiber Loop

Research on performance of vector magnetic field sensor based on side-polished hollow-core fiber coated with magnetic fluid

2021 ◽  
Author(s):  
Ronghui Xu ◽  
Guozhen Niu ◽  
Yipu Xue ◽  
Chengran Ke ◽  
Shijie Deng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Magnetic Field Sensor ◽  
Hollow Core ◽  
Vector Magnetic Field ◽  
Field Sensor ◽  
Core Fiber
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