A high-precision triaxial fluxgate sensor for space applications: layout and choice of materials

Nielsen, Ole-Kenneth; Brauer, Peter; Primdahl, F.; Risbo, T.; Jørgensen, John Leif; C, Boe; Deyerler, Michael; Bauereisen, Stefan

doi:10.1016/s0924-4247(97)80169-0

Cited by 29 publications

(17 citation statements)

References 5 publications

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“…The geometry of the core has also influence on sensitivity and noise of the fluxgate [2]. Another factor is magnetostriction: traditionally it is believed that low magnetostriction is favorable to achieve low noise in fluxgate [3], [4]. Recently, Hsu et al [5] analyzed the influence of magnetostriction on power losses and acoustic noise of cores composed of amorphous tape.…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetostriction of NiFe Electroplated Film on the Noise of Fluxgate

et al. 2014

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One of the sources of fluxgate noise is the noise originating in the magnetic core. Several parameters, such as anisotropy and shape, are traditionally studied and optimized to reduce the noise. In this paper, we show how the magnetostriction influences the noise of the fluxgate. We electroplated NiFe thin-film over a copper layer using different current density. By energy-dispersive X-ray spectroscopy we show that the mutual percentage of Fe and Ni in the film depends on the current density. As a result the magnetostriction is changed from negative to positive values, with minimum magnetostriction found at around Fe 19 Ni 81 composition. When we used these ring cores as base for a fluxgate we observed that the noise rapidly rises as the absolute value of magnetostriction increases, while the minimum noise is achieved at lowest value of magnetostriction. An increase of one order of magnitude of the magnetostriction causes and increment of almost two orders of magnitude in the noise. Therefore, we conclude that it is vital to employ alloys with the lowest possible magnetostriction as core for fluxgates.

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Section: Introductionmentioning

confidence: 99%

Influence of Magnetostriction of NiFe Electroplated Film on the Noise of Fluxgate

et al. 2014

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“…• C (Nielsen et al, 1995(Nielsen et al, , 1997. The resulting thermal linear expansion of the feedback coils is a graduation from approximately 13 ppm/…”

Section: Applicationmentioning

confidence: 99%

“…The principal aim of the Ørsted mission (Neubert et al, 2001) is to accurately map the Earth's magnetic field (Olsen et al, 2000a, b;Olsen, 2002), and high-precision magnetic field measurements spanning three years are now available. The satellite is equipped with a scalar Overhauser magnetometer (OVH) (Duret et al, 1996), a tri-axial fluxgate magnetometer (CSC, for Compact Spherical Coil) (Nielsen et al, 1995(Nielsen et al, , 1997) and a Star Imager (SIM) (Jørgensen, 2000) which determines the attitude of the satellite with high accuracy. The OVH is mounted at the top of an 8 m long boom; the CSC and the SIM are mounted closely together on an optical bench which is located 2 m away from the scalar magnetometer and 6 m away from the satellite body.…”

Section: Introductionmentioning

confidence: 99%

Calibration of the Ørsted vector magnetometer

et al. 2014

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The vector fluxgate magnetometer of the Ørsted satellite is routinely calibrated by comparing its output with measurements of the absolute magnetic intensity from the Overhauser instrument, which is the second magnetometer of the satellite. We describe the method used for and the result obtained in that calibration. Using three years of data the agreement between the two magnetometers after calibration is 0.33 nT rms (corresponding to better than ±1 nT for 98% of the data, and better than ±2 nT for 99.94% of the data). We also report on the determination of the transformation between the magnetometer coordinate system and the reference system of the star imager. This is done by comparing the magnetic and attitude measurements with a model of Earth's magnetic field. The Euler angles describing this rotation are determined in this way with an accuracy of better than 4 arcsec.

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“…Some magnetic sensor types have been shown to be relatively rad-hard, including Hall (Bolshakova 1999;Bolshakova et al 2009), SQUID (Nagaishi et al 2003), magnetoresistive (anisotropic magnetoresistance, AMR (Díaz-Michelena 2009;Sanz et al 2012); giant magnetoresistance, GMR (Carroll 2010); and magnetic tunnel effect magnetoresistance, TMR (Persson et al 2011) type), coils (Nemoto et al 2011), and fluxgate (Nielsen et al 1997) sensors. These effects are, of course, temperature, dose, dose rate, flux, and radiation-type dependent.…”

Section: Magnetic Sensor Materials and In-situ Measurementsmentioning

confidence: 99%