High-Precision Temperature-Compensated Magnetic Field Sensor Based on Optoelectronic Oscillator

A radio frequency (RF)-assisted Sagnac interferometer based on a dual-loop optoelectronic oscillator (OEO) is experimentally demonstrated for high-precision magnetic field measurement, in which the tapered fiber covered with the magnetic fluid (MF) as the magnetic field sensing head is embedded in the Sagnac interferometer. The evanescent field of the tapered fiber can interact with the MF under the external magnetic field to cause the birefringence variation of the fundamental mode, leading to the change in the free spectral range (FSR) of the interferometer, which can be mapped to the oscillation frequency shift of the OEO in the microwave domain. By the above converting, the magnetic field measurement with high interrogation speed and resolution can be realized. In addition, the designed device shows a certain measurement directionality of the magnetic field due to two orthogonally polarized fundamental modes asymmetric to the magnetic field, obtaining a good conformity with the constructed theoretical models. The experimental results show the maximum magnetic field sensitivities of 159.4 Hz/mT in the range of 8.48-27.83 mT, and 350.8 Hz/mT in the range of 0-5.14 mT, corresponding to the light wave vector parallel and perpendicular to the magnetic field, respectively.

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“…temperature and vibration). It can be weaken by the thermostatic and vibration isolation devices or phase compensation methods [25] .…”

Section: Resultsmentioning

confidence: 99%

Highly Precise Magnetic Field Measurement Based RF-Assisted Sagnac Interferometer With Tapered Fiber

Feng

Tang

et al. 2023

IEEE Photonics J.

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“…For instance, an intensity sensitivity of 81 pm/mT based on an elliptical core fiber Bragg grating has been proposed by Gao et al [18]. A temperaturecompensated magnetic field sensor based on incorporating cascaded magnetostrictive alloy-fiber Bragg grating was achieved for the detection of magnetic field and temperature with sensitivities of 250 Hz/Oe and 1.97 or 1.42 kHz/°C [19]. Recently, two magnetic field measurement methods by combining reflective Fabry-Perot interferometer with MF were present to obtain considerable sensitivities (268.81 pm/Gs from 15.5 to 139.7 Gs [20], 1.02602 nm/Gs from 118.768 to 166.261 Gs [21]).…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Based Polydimethylsiloxane Microspheres for Magnetic Field Measurement

Sun

Wang

et al. 2022

IEEE Trans. Instrum. Meas.

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Magnetic-based polydimethylsiloxane microspheres (MPMs) are fabricated and its applications for measurement of magnetic field are investigated. The MPMs are prepared by first incorporating the uniformly sized Mn3O4 nanocrystals into polydimethylsiloxane (PDMS) matrix, and then using a selfassembling method to obtain a chain of microspheres on the fiber taper. The MPMs are regarded as optical resonators, demonstrating whispering gallery modes (WGM) with a high Q factor in the 1310 nm band. Experimental results show that the resonance wavelengths of the WGM spectra depend on the strength of the magnetic field since the change in the applied filed cause the mechanical deformation of the MPMs, leading to a shift in the resonant wavelength of the resonator. Using as magnetic field sensors, the performances of the MPMs in terms of sensitivities and measurement ranges have been optimized. Thus, the sensitivity of 101.9 pm/mT and the measurement range up to 8 mT are achieved with a MPM (~270 μm in diameter). Besides, the performance of the MPM after two-week storage is analyzed, showing the excellent long-term stability.

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“…The oscillating frequency of the OEO is determined by the overall time delay of the loop, which will be affected by the wavelength change of the sensing FBG. According to this concept, another approach to implement an OEO-based FBG sensor has been proposed for position location [15], axial strain detection [16] and magnetic field measure [17]. In [16], an interrogation scheme for normal FBG sensors employing an OEO loop containing a dispersive medium have been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…The sensitivity is about 58 Hz/μɛ, which will not satisfy some requirements of extremely small axial strain measurements. In [17], a magnetic field sensor based on two OEOs incorporating cascaded magnetostrictive alloy-fiber Bragg grating (MA-FBG) and FBG filters have been demonstrated. The second FBG is used to separate two measurands and the sensitivity for magnetic field and temperature are about 250 Hz/Oe and 1.97 or 1.42 Hz/℃.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement for Fiber Bragg Grating Strain Sensing Based on Optoelectronic Oscillator With Vernier Effect

et al. 2021

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Based on a dual-loop optoelectronic oscillator (OEO) with Vernier effect, a scheme of fiber Bragg grating (FBG) interrogation system with an improved scale factor has been proposed and experimentally demonstrated. Functioning as the optical carrier of the OEO, the reflection signal of two cascaded FBGs is divided into two optical beams by using a wavelength division multiplexer (WDM). The two optical beams at different wavelengths travel along single mode fibers with different lengths. After combined together by another WDM, the two optical beams go through a section of dispersion compensation fiber (DCF). The oscillating frequency shift of the OEO is determined by the overall time delay, which is affected by the wavelength change of the sensing FBG. Thus, the wavelength change of the sensing FBG can be converted into the oscillating frequency shift of the OEO. Furthermore, due to the length difference between the two optical beams, an obvious Vernier effect has been generated in the frequency response of the OEO. By detecting the frequency shift of the envelope peak of the frequency response curve, the sensitivity of the sensing interrogation can be enhanced greatly. A proof-of-concept OEO-based FBG sensor for axial strain sensing experiment is performed. The experimental results show that the sensitivity is about 0.31 KHz/μɛ for a single-loop OEO. By employing Vernier effect, the sensitivity can be improved to -11 KHz/μɛ, which is 35 times higher than that of the single-loop OEO.

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High-Precision Temperature-Compensated Magnetic Field Sensor Based on Optoelectronic Oscillator

Cited by 41 publications

References 24 publications

Highly Precise Magnetic Field Measurement Based RF-Assisted Sagnac Interferometer With Tapered Fiber

Highly Precise Magnetic Field Measurement Based RF-Assisted Sagnac Interferometer With Tapered Fiber

Magnetic-Based Polydimethylsiloxane Microspheres for Magnetic Field Measurement

Sensitivity Enhancement for Fiber Bragg Grating Strain Sensing Based on Optoelectronic Oscillator With Vernier Effect

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