Effects of Core Dimensions and Manufacturing Procedure on Fluxgate Noise

Janošek, Michal; Vyhnánek, Jan; Zikmund, Ales; Butvin, P.; Butvinová, B.

doi:10.12693/aphyspola.126.104

Cited by 7 publications

(4 citation statements)

References 5 publications

(5 reference statements)

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“…According to the structure, fluxgate magnetometers can be classified into the parallel type and orthogonal type. For the parallel type fluxgate magnetometer, the 1-pT noise for 1 Hz can be only obtained with special arrangements and cross correlation measurements [ 34 , 35 , 36 , 37 , 38 , 39 ]. On the other hand, for the orthogonal type, low noise can be only obtained with the fundamental-mode operated fluxgate.…”

Section: Basic Researchmentioning

confidence: 99%

Recent Progress of Fluxgate Magnetic Sensors: Basic Research and Application

Wei

Liao

Zhang

et al. 2021

Sensors

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Fluxgate magnetic sensors are especially important in detecting weak magnetic fields. The mechanism of a fluxgate magnetic sensor is based on Faraday’s law of electromagnetic induction. The structure of a fluxgate magnetic sensor mainly consists of excitation windings, core and sensing windings, similar to the structure of a transformer. To date, they have been applied to many fields such as geophysics and astro-observations, wearable electronic devices and non-destructive testing. In this review, we report the recent progress in both the basic research and applications of fluxgate magnetic sensors, especially in the past two years. Regarding the basic research, we focus on the progress in lowering the noise, better calibration methods and increasing the sensitivity. Concerning applications, we introduce recent work about fluxgate magnetometers on spacecraft, unmanned aerial vehicles, wearable electronic devices and defect detection in coiled tubing. Based on the above work, we hope that we can have a clearer prospect about the future research direction of fluxgate magnetic sensor.

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Section: Basic Researchmentioning

confidence: 99%

Recent Progress of Fluxgate Magnetic Sensors: Basic Research and Application

Wei

Liao

Zhang

et al. 2021

Sensors

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“…Our experience indicates that f uxgate ring-core sensors with higher effective diameter of the magnetic core provide lower noise [11]. Therefore, we extended the inner volume of the feedback support to maximize the possible ring-core diameter.…”

Section: Two-ring-core Inner Structurementioning

confidence: 99%

Vector Feedback Homogeneity and Inner Layout Influence on Fluxgate Sensor Parameters

Petrucha

Janošek

Azpúrua

2015

IEEE Trans. Instrum. Meas.

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Abstract-Vector feedback is a concept which can significantly improve linearity and stability of a magnetic field sensor. The feedback coils effectively cancel the measured magnetic field in the inner volume of the triaxial sensor. Thus, in case of fluxgates, it suppresses one possible source of nonlinearitycross-field sensitivity error. The triaxial sensor axes orthogonality should be primarily defined by the orientation of the feedback coils, while the sensitivities are defined by feedback coil constants. The influence of the homogeneity of the feedback field and the influence of the sensor inner layout on calibration parameters of a vectorially compensated triaxial fluxgate magnetometer are presented.

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“…Among them, orthogonal fluxgates in fundamental mode [ 13 ] have shown a remarkable low noise due to the mechanism that keeps their magnetization always in a saturated state, reducing the Barkhause noise. For instance, magnetometers based on amorphous CoFeSiB microwire exhibited a noise of only

[ 14 ], which is superior to the best reported noise of any second harmonic fluxgate so far [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

An Improved Composition of CoFeSiB Alloy for Orthogonal Fluxgates

Butta

Janošek

Pařez

et al. 2022

Sensors

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Orthogonal fluxgates in fundamental mode based on (Co0.94Fe0.06)72.5Si12.5B15 cores have recorded very low noise in literature, especially if Joule annealing is performed on the core for a short period of time. However, for annealing time longer than 20–30 min, the noise of the sensor has a tendency to increase. In this work, we investigated this phenomenon, and we have found its origin in a monotonic increase of magnetostriction during the annealing process. We show that the wires with vanishing magnetostriction in their as-cast form exhibit positive magnetostriction after long-time annealing (more than 30 min), which increases the noise of the sensor. After researching the effect of the magnetostriction after annealing on the noise, we propose an alloy with a reduced amount of iron. Less iron leads to a larger as-cast negative magnetostriction, which becomes almost zero after long-time annealing (60 min), bringing further reduction of noise. We prove this effect on two wires from two different manufacturers, although with the same composition. The noise decrease with prolonged annealing is mainly observable in the low-frequency region: at 100 mHz, the noise of a single-wire sensor decreased from 20pT/Hz to 6pT/Hz when the annealing time was prolonged from 10 to 60 min.

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Effects of Core Dimensions and Manufacturing Procedure on Fluxgate Noise

Cited by 7 publications

References 5 publications

Recent Progress of Fluxgate Magnetic Sensors: Basic Research and Application

Recent Progress of Fluxgate Magnetic Sensors: Basic Research and Application

Vector Feedback Homogeneity and Inner Layout Influence on Fluxgate Sensor Parameters

An Improved Composition of CoFeSiB Alloy for Orthogonal Fluxgates

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