Improvements on CoFeSiB amorphous ribbon for fluxgate sensor cores

Benyosef, Luiz; Teodósio, J.R; Taranichev, V. E.; Jalnin, B.V.

doi:10.1016/0956-716x(95)00425-u

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…The choice of the alloys used in this work was based on the magnetic properties expected for the development of a sensor providing high sensitivity with a low noise level. Thus, compositions were selected which have low values of coercive force, Curie temperature and near zero magnetostriction, besides selecting options to obtain high values of magnetic permeability 3 ). These alloys were produced by the melt-spinning technique, which consists of ejecting the molten material onto an iron wheel rotating at an angular velocity sufficiently high to prevent the material from crystallizing 13 .…”

Section: Methodsmentioning

confidence: 99%

“…According to previous works 5,3,[15][16][17][18][19][20] , heat treatments were chosen that improved the magnetic characteristics of the ribbons, such as the reduction of coercive force and approximation of the magnetostriction coefficient value to zero for the generation of low noise levels. The procedure employed in this work consisted of a 1-hour thermomechanical treatment at 340 °C in an argon atmosphere, under a longitudinal tension of 300 MPa.…”

Section: Stress Annealing Heat Treatmentmentioning

confidence: 99%

“…where n s is the number of windings of the sensor coil, A is the core cross-sectional area and Φ is the magnetic flux in the coil. It is well known that the characteristics of the core material are fundamental in improving the intensity of the induced signal, which in turn supplies information on the field to be evaluated 3 . However, it is advisable to use materials with high relative permeability (m r ) and demagnetization factor (D), as can be verified by the fundamental fluxgate equation (Equation 2):…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the magnetic properties of materials for fluxgate sensors

2008

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A study was made of the variation of the magnetic properties of cobalt-based alloys using different compositions of CoFeSiB and CoFeSiBCr systems, which were produced by the melt-spinning technique and some of them subjected to a stress annealing treatment. A comparative study of core geometry and supporting material was also performed in order to obtain low noise fluxgate sensor core using amorphous magnetic ribbons of these alloys. The best alloy was a stress annealed Co67.5Fe3.5Si17.4B11.6 sample, which yielded fluxgate sensors with lower noise levels than those of commercial crystalline materials

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Section: Methodsmentioning

confidence: 99%

Section: Stress Annealing Heat Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of the magnetic properties of materials for fluxgate sensors

2008

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“…The right choice of materials and special thermal treatment can produce sensors with very low noise figures. The characteristics of the core material are also fundamental to improve the intensity of the induced signal in the sense coil [2]. There are several new amorphous and crystaline (nanocrystaline) materials available [3,4,5], and deeper investigation would be necessary to see if this class of material has the potential to be used in fluxgate applications.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Aeromagnetic Surveys Using a Fluxgate Magnetometer

Macharet

Perez-imaz

Rezeck

et al. 2016

Sensors

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Recent advances in the research of autonomous vehicles have showed a vast range of applications, such as exploration, surveillance and environmental monitoring. Considering the mining industry, it is possible to use such vehicles in the prospection of minerals of commercial interest beneath the ground. However, tasks such as geophysical surveys are highly dependent on specific sensors, which mostly are not designed to be used in these new range of autonomous vehicles. In this work, we propose a novel magnetic survey pipeline that aims to increase versatility, speed and robustness by using autonomous rotary-wing Unmanned Aerial Vehicles (UAVs). We also discuss the development of a state-of-the-art three-axis fluxgate, where our goal in this work was to refine and adjust the sensor topology and coupled electronics specifically for this type of vehicle and application. The sensor was built with two ring-cores using a specially developed stress-annealed CoFeSiB amorphous ribbon, in order to get sufficient resolution to detect concentrations of small ferrous minerals. Finally, we report on the results of experiments performed with a real UAV in an outdoor environment, showing the efficacy of the methodology in detecting an artificial ferrous anomaly.

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Low-noise permalloy ring cores for fluxgate magnetometers

Miles

Ciurzynski

Barona

et al. 2019

Geosci. Instrum. Method. Data Syst.

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Abstract. Fluxgate magnetometers are important tools for geophysics and space physics, providing high-precision magnetic field measurements. Fluxgate magnetometer noise performance is typically limited by a ferromagnetic element that is periodically forced into magnetic saturation to modulate, or gate, the local magnetic field. The parameters that control the intrinsic magnetic noise of the ferromagnetic element remain poorly understood. Much of the basic research into producing low-noise fluxgate sensors was completed in the 1960s for military purposes and was never publicly released. Many modern fluxgates depend on legacy Infinetics S1000 ring cores that have been out of production since 1996 and for which there is no published manufacturing process. We present a manufacturing approach that can consistently produce fluxgate ring cores with a noise of ∼6–11 pT per square root hertz – comparable to many of the legacy Infinetics ring cores used worldwide today. As a result, we demonstrate that we have developed the capacity to produce the low-noise ring cores essential for high-quality, science-grade fluxgate instrumentation. This work has also revealed potential avenues for further improving performance, and further research into low-noise magnetic materials and fluxgate magnetometer sensors is underway.

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Improvements on CoFeSiB amorphous ribbon for fluxgate sensor cores

Cited by 3 publications

References 2 publications

Optimization of the magnetic properties of materials for fluxgate sensors

Optimization of the magnetic properties of materials for fluxgate sensors

Autonomous Aeromagnetic Surveys Using a Fluxgate Magnetometer

Low-noise permalloy ring cores for fluxgate magnetometers

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