Precise Scalar Calibration of a Tri-Axial Braunbek Coil System

Zikmund, Ales; Ripka, Pavel; Ketzler, Rainer; Harcken, Hans; Albrecht, M.

doi:10.1109/tmag.2014.2357783

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…The most accurate calibrations can be provided by a scalar calibration of the coil system [13] [14] which can provide also its non-orthogonalities. Another option is using NMR, mainly with flowing water [15][16] which allows for very small measurement volume of the pickup-coil.…”

Section: A Available Methodsmentioning

confidence: 99%

Magnetic Calibration System With Interference Compensation

et al. 2019

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The article describes a novel method for calibrating dc-precise magnetometers in the low field range (± 100 μT), which gives acceptable results even in laboratory conditions with significant magnetic interference. By introducing a closely mounted reference magnetometer and a specific calibration procedure, it is possible to compensate for the external magnetic field disturbances caused e.g. by local transportation operated with dc power supplies. The field compensation occurs only shortly after the calibrating coils are energized. In this case, the leakage of coils magnetic flux to the reference sensor due to the cancellation of the time-varying compensating field was negligible. When using 60-cm coils and reference sensor in 2.5-m distance, we were able to calculate magnetometer gains with a standard deviation of 91 ppm. We show that an overall uncertainty of 0.1% can be achieved.

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Section: A Available Methodsmentioning

confidence: 99%

Magnetic Calibration System With Interference Compensation

et al. 2019

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“…For calibration measurements, the entire setup described above was operated in PTB's earth field compensation facility [4]. Inside this three-axis coil system, the earth magnetic field was actively compensated in such a way that the remaining environmental field was kept at a constant flux density below 300 nT with variations below 10 nT during the measurements.…”

Section: Measurement Proceduresmentioning

confidence: 99%

“…The orthogonality of these sensors can be determined in a constant field via rotation and a scalar fit procedure [1], [2]. It is also possible to determine the orthogonality of a tri-axial coil system via scalar flux measurements [4]. Such measurements are suitable for an intrinsic calibration of the orthogonality but do not yield the orientation of the sensor with respect to an external coordinate system.…”

Section: Introductionmentioning

confidence: 99%

Orientation of a Vector Magnetometer Optically Referenced to an External Coordinate System

et al. 2020

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We present a new method to realize a vector magnetometer that has been optically referenced to an external coordinate system. The vector magnetometer is made up of three Hall sensors attached to orthogonal faces of a glass cube. When placed in a homogeneous magnetic field, rotating the vector magnetometer around two axes allows the orientation of each sensor to be determined with respect to the glass cube. The orientation of the glass cube is detected by an autocollimator and optically referenced to an external coordinate system. A direction uncertainty below 130 µrad (which is traceable to angle standards) is achieved.

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“…However, since the alignment of many coils is difficult, large coil systems mostly use four coils for one axis [22]. So, we adopt the design of a four-coil system for one axis.…”

Section: Coil Designmentioning

confidence: 99%

Optimization of a Coil System for Generating Uniform Magnetic Fields inside a Cubic Magnetic Shield

Cao

Pan

et al. 2018

Energies

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Ultra-low magnetic fields have drawn lots of attention due to their important role in scientific and technological research. The combination of a magnetic shield and an active compensation coil is adopted in most high performance magnetically shielded rooms. Special consideration needs to be taken in the coil design since the magnetic shield significantly affects the uniformity of the magnetic field that is generated by the coil. An analytical model for the magnetic field calculation of the coil inside a cubic magnetic shield is proposed based on the generalized image method, which is validated by finite element analysis. A novel design method of the coil used in a cubic magnetic shield with a large homogeneous volume is proposed. The coil parameters are optimized to obtain a large cubic uniform volume with desired total deviation rate by discretizing the central volume in the coil. In the desired total deviation rate, the normalized usable volume of the new coil increases by 70% when compared with the Merritt coil. A coil system is developed according to the parameters obtained based on this method. The magnetic flux density and practical deviation rate of the coil are measured to validate the accuracy of this model and the feasibility of the design method. The experimental magnetic flux density agrees well with the analytical value. The maximum practical deviation rate of uniform volume of 0.8 × 0.8 × 0.8 m is in good agreement with the theoretical design value, taking into account the experiment errors.

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Precise Scalar Calibration of a Tri-Axial Braunbek Coil System

Cited by 11 publications

References 3 publications

Magnetic Calibration System With Interference Compensation

Magnetic Calibration System With Interference Compensation

Orientation of a Vector Magnetometer Optically Referenced to an External Coordinate System

Optimization of a Coil System for Generating Uniform Magnetic Fields inside a Cubic Magnetic Shield

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