Injection Locking in Coupled Core Fluxgate Magnetometers: Exploiting Nonlinearity to Enhance Sensitivity to Weak, Low Frequency, Target Magnetic Fields

Antoci, Fabio; Andò, B.; Trigona, Carlo; Bulsara, Adi R.; Nikitin, Alexander P.; Stocks, Nigel G.; Baglio, Salvatore

doi:10.1109/jsen.2013.2283579

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…The first use of IL in a magnetometer was reported in a superconducting DC SQUID [7] and then more recently applied to a novel coupled-core fluxgate magnetometer (CCFG) [8]. We review these two systems and also propose a new magnetometer based on a circuit originally proposed by Takeuchi and Harada [9].…”

Section: Magnetometersmentioning

confidence: 99%

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Injection locking in self-oscillating magnetometers

Nikitin

Stocks

2020

IEEE Instrum. Meas. Mag.

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Section: Magnetometersmentioning

confidence: 99%

“…The SNR improvement has previously been reported in experiments and numerical simulations of Eq. (6) [8,18]. The CCFM has been studied theoretically [17] but, similar to the DC SQUID, no closed form solution for the SNR exists.…”

Section: Ccfmmentioning

confidence: 99%

Injection locking in self-oscillating magnetometers

Nikitin

Stocks

2020

IEEE Instrum. Meas. Mag.

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“…The nonzero magnetic field can give rise to output nonlinearity, sensitivity limitation, and frequency change. These undesired effects will cause sensor accuracy degradation [16] and increase the complexity of injection locking, which can effectively reduce the sensor noise floor [17,18] If the CCFM is working at a zero magnetic field during its operation, these degradations will vanish. Based on this fact, the feedback system with modified RTD detection method to achieve a zero magnetic field running regime of CCFM.…”

Section: Optimization Based On Feedback Technologymentioning

confidence: 99%

Design and Implementation of Close-loop Detection for Coupled Core Fluxgate Magnetic Sensors

Wang

Shi

et al. 2020

2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)

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This paper presents a closed-loop detection strategy with significant potential to solve the detection defects existed in the residence-times difference (RTD) method of the coupled core fluxgate magnetic sensors. The external magnetic field (e.g. Earth's magnetic field), as the main source of these detection defects, has been analyzed by the theoretical investigation. To overcome such deficiencies, the close-loop detection method based on the analog-type RTD readout method and magentic flux-balance detection is utilized to implement external magnetic field real-time compensation and achieve a near-zero-field working state of the magnetic material. The fluxgate with the optimized detection strategy and vertical arrangement structure has been designed, fabricated and examined, and the preliminary results showed steady operation and a detection resolution of ±0.10 nT. The optimized detection method based on the balance detection concept proposed in this manuscript demonstrated a great potential to obtain the optimal detection performances which are embedded in the couplinginduced oscillation of nonlinear dynamics.

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“…Present CCFM probe is horizontal arrangement (HA) as shown in Fig. 1(a), and the fluxgate elements are placed on the surface of triangular support [7][8][9]. The huge volume waste mainly caused by the triangular support puts forward higher requirements for the spatial uniformity of the target magnetic field [13].…”

Section: A Vertical Arrangement For Ccfm Probementioning

confidence: 99%

“…However, the bulky probe containing at least 3 elements constrains the sensor spatial resolution. And the magnetic crosstalk among adjacent elements inducing spurious signal makes CCFM far worse than its detection limit [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Crosstalk Suppression and Probe Miniaturization of Coupled Core Fluxgate Sensors

Heidari

Shi

et al. 2019

2019 Ieee Sensors

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This paper demonstrates the probe structure optimization of coupled core fluxgate magnetic sensors through finite element analysis. The obtained modelling results have been used to optimize the probe structures from horizontal-to vertical-arrangements for magnetic crosstalk suppression and probe miniaturization. The finite element analysis show that with the same distance between each adjacent fluxgate elements, the magnetic crosstalk is suppressed by 6 times and the volume is reduced by 2 times after the optimization. Furthermore, the miniaturized probes with low magnetic crosstalk have been designed and implemented. The experimental results which showed more than 5 times suppression of magnetic crosstalk verified the simulation results. Therefore, the results provide detailed reference to cope with the contradiction between volume miniaturization and magnetic crosstalk suppression in magnetic sensor-array design.

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Injection Locking in Coupled Core Fluxgate Magnetometers: Exploiting Nonlinearity to Enhance Sensitivity to Weak, Low Frequency, Target Magnetic Fields

Cited by 7 publications

References 26 publications

Injection locking in self-oscillating magnetometers

Injection locking in self-oscillating magnetometers

Design and Implementation of Close-loop Detection for Coupled Core Fluxgate Magnetic Sensors

Magnetic Crosstalk Suppression and Probe Miniaturization of Coupled Core Fluxgate Sensors

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