Magnetic Field Sensor Based on Microfiber Sagnac Loop Interferometer and Ferrofluid

Lv, Fangxing; Han, Chunyang; Ding, Hui; Wu, Zhongying; Li, Xianli

doi:10.1109/lpt.2015.2462749

Cited by 28 publications

(10 citation statements)

References 17 publications

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“…5(b and c) . The maximum sensitivity to a magnetic field achieved in the experiments is estimated to be −100 pm/mT in the range from 0 to 200 mT, for the sample with MF of IO-A10-1, and PMF length of 75 cm, which is much better than the sensitivity of 0.5 pm/Oe for a magnetic sensor using a similar MFC-Sagnac loop without PMF, reported in reference 12 in 2015. Similarly for the sample with the PMF length of 20 cm, the maximum sensitivity is estimated as −488 pm/mT in the magnetic field range from 0 to 200 mT.…”

Section: Resultsmentioning

confidence: 57%

“… 11 reported a magnetic field sensor with an MFC surrounded with a magnetic fluid, with a sensitivity of 191.8 pm/Oe in a narrow range of weak magnetic fields of up to ~300 Oe. Several researchers 12 , 13 reported experimental and theoretical studies of fiber sensors where an MFC was combined with a Sagnac loop for sensing of refractive index or magnetic field, showing that a very high sensitivity is achievable with such structures.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field sensor based on a combination of a microfiber coupler covered with magnetic fluid and a Sagnac loop

Wei¹,

Mallik²,

Liu³

et al. 2017

Sci Rep

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This paper proposes a novel magnetic field sensor based on a microfiber coupler (MFC) combined with a magnetic fluid (MF) in a Sagnac loop formed from a polarization maintaining fiber (PMF). Thanks to the small (~2.6 μm) waist diameter of the MFC, the resulting interference is strongly influenced by the presence of the MF and this leads to the desirable high sensitivity of the structure to the applied magnetic field. The maximum magnetic field sensitivities of −100 pm/mT and −488 pm/mT have been experimentally demonstrated with the PMF lengths of 75 cm and 20 cm respectively in the range of magnetic field strengths from 0 to 200 mT. The dependence of the magnetic field orientation on the performance of the proposed sensor was also examined. The proposed magnetic field sensor is advantageous for applications requiring higher sensitivity over a wide magnetic field range.

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Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Magnetic field sensor based on a combination of a microfiber coupler covered with magnetic fluid and a Sagnac loop

Wei¹,

Mallik²,

Liu³

et al. 2017

Sci Rep

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show abstract

“…The sensitivities of 8.16nmN -1 , 11.22nmN -1 , and 16.32nmN -1 are obtained respectively when the force is varied from 0 to 0.392N. Lv et al [11] designed and fabricated a Sagnac interferometer that consists of microfiber of singlemode and ferrofluid. The Sagnac interferometer is employed for a magnetic field sensor.…”

Section: Introductionmentioning

confidence: 99%

Microring Distributed Sensors Using Electron Cloud Generated by Four-point Probe Sagnac Interferometer

Garhwal¹,

Arumona²,

Ray³

et al. 2021

Preprint

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A micro Sagnac interferometer integration is proposed for electron cloud distributed sensors. The Sagnac interferometer consists of four microring probes integrated into a Sagnac loop. Each of the microring probes is embedded with the silver bars to form the plasmonic wave oscillation. At the center microrings, electrons are trapped and oscillated by the whispering gallery modes (WGMs), where the plasmonic antennas are established and applied for wireless fidelity (WiFi) and light fidelity (LiFi) transmissions for distributed sensors. The antenna gains are 2.59dB, 0.93dB, 1.75dB, and 1.16dB respectively for the four antennas formed at the center microrings. The polarized light of 1.50µm wavelength is fed into the interferometer input, which is polarized randomly into upstream and downstream directions. The polarization components can be obtained by the space-time modulation control. By controlling the electron cloud spin orientation, the space-time projection can be applied, and the ultra-high measurement resolution can be obtained in terms of fast switching time (change in phase). In manipulation, the applied stimuli are substituted by the change in input source power. The light input power variation causes a change in electron cloud density. Similarly, when the electron cloud is excited by the microscopic medium, which can be employed as the microscopic sensors. The WGM sensors have sensitivities of 1.35µm-2, 0.90µm-2, 0.97µm-2 and, 0.81µm-2, respectively. The WGMs behave as a four-point probe for the electron cloud distributed sensors, where the electron cloud sensitivities of 2.31 prads-1mm3 (electrons)-1, 2.27prads-1mm3 (electrons)-1, 2.22 prads-1mm3(electrons)-1, 2.38prads-1mm3(electrons)-1 are respectively obtained.

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“…Microfiber-based magnetic field sensors show higher sensitivity to surrounding refractive index (RI) than traditional optical structures utilizing interference, because their much smaller diameter means that a larger proportion of the evanescent field surrounding the microfiber can interact with the local environment. Examples of such structures include an optical microfiber mode interferometer coated with a magnetic fluid (MF) [7,8], an MFC combined with a Sagnac loop [9], and an MFC surrounded with MF [10]. Several researchers reported experimental and theoretical studies of fiber sensors where an asymmetric taper for sensing of RI or magnetic field showed that a very high sensitivity is achievable with such structures [11].…”

Section: Introductionmentioning

confidence: 99%

Temperature-compensated magnetic field sensing with a dual-ring structure consisting of microfiber coupler-Sagnac loop and fiber Bragg grating-assisted resonant cavity

et al. 2019

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A novel temperature-compensated magnetic field sensor based on a ring erbium-doped fiber laser combined with a fiber Bragg grating (FBG) and a Sagnac loop containing a microfiber coupler (MFC) and magnetic fluid is proposed and investigated. Thanks to the dual-ring structure of the MFC-Sagnac loop and the FBG-assisted resonant cavity, the output of the structure has two distinct laser peaks. In addition to the magnetic field sensing capability, the proposed structure can simultaneously provide temperature information. The maximum experimentally demonstrated sensitivity to a magnetic field determined from the spectral shift of one laser peak is 102 pm/mT in the magnetic field range from 0 to 60 mT. The spectral position of the other laser peak is independent of the magnetic field but shifts toward longer wavelengths with temperature with a sensitivity of 18 pm/°C. The proposed magnetic field sensor is advantageous for applications requiring measurement accuracy over a wide magnetic field range with a compensating of temperature information.

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Magnetic Field Sensor Based on Microfiber Sagnac Loop Interferometer and Ferrofluid

Cited by 28 publications

References 17 publications

Magnetic field sensor based on a combination of a microfiber coupler covered with magnetic fluid and a Sagnac loop

Magnetic field sensor based on a combination of a microfiber coupler covered with magnetic fluid and a Sagnac loop

Microring Distributed Sensors Using Electron Cloud Generated by Four-point Probe Sagnac Interferometer

Temperature-compensated magnetic field sensing with a dual-ring structure consisting of microfiber coupler-Sagnac loop and fiber Bragg grating-assisted resonant cavity

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