Analytical Optimization of Low-Frequency Search Coil Magnetometers

Grosz, Asaf; Paperno, E.

doi:10.1109/jsen.2012.2202179

Cited by 41 publications

(29 citation statements)

References 15 publications

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“…|e n | and |i n | denote the effective values of e n and i n respectively. When we set (9) to be equal to (1), the sensitivity threshold [12] (also called the noise equivalent magnetic induction [20]) B st can be obtained as .…”

Section: Analysis Of the Scm Response And Its Noisementioning

confidence: 99%

“…Thus, the optimization problem becomes the optimization of d w and N that minimizes the bandwidth for the primary receiving SCM, which is subjected to a given volume and sensitivity threshold as (14) For reference SCMs, the optimization goal is to minimize the volume, which is subjected to a given bandwidth and sensitivity threshold as (15) Both r s and L s in (6), (7), and (8) are dependent variables of d w and N according to (11) and (12). This is the same as the case for…”

Section: Solution To the Scm Optimization Problemmentioning

confidence: 99%

“…Adopting a ferromagnetic core effectively increases air coil sensitivity without enlarging the coil size [10]. Currently, most ferromagnetic-cored coil designs focus on their wideband performance [11][12][13]. However, TEC requires very narrow bandwidth, i.e., a few hundred Hertz in VLF and a few Hertz in super-low frequency (SLF, 30 Hz-300 Hz).…”

Section: Introductionmentioning

confidence: 99%

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Design of the Magnetic Field Sensing System for Downlink Signal Reception and Interference Cancelling for Through-the-Earth Communication

Zhao¹,

Jiang²,

Zhang³

et al. 2016

Journal of Magnetics

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A magnetic field sensing system with a single primary sensor and multiple reference sensors deployed locally and orthogonally, was proposed for downlink signal reception and interference cancelling for Through-theEarth Communication (TEC). This paper mathematically analyzes a design optimization process for a search coil magnetometer (SCM), and applies that process to minimize the bandwidth of the primary SCM for TEC signal reception and the volume of reference SCMs for multiple distributions. The primary SCM achieves a 3-dB bandwidth of 7 Hz, a sensitivity threshold of 120 fT/√Hz, and a volume of 2.32 × 10 −4 m 3 . The entire sensing system volume is as small as 10 −2 m 3. Experiments with interference from industrial frequency harmonics demonstrated an average of 36 dB and 18 dB improvements in signal-to-interference ratio and signal-tointerference plus noise ratio, respectively, using multichannel recursive-least-squares algorithm. Thus, the proposed sensing system can reduce the interference effectively and allows reliable downlink signal reception.

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Section: Analysis Of the Scm Response And Its Noisementioning

confidence: 99%

Section: Solution To the Scm Optimization Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of the Magnetic Field Sensing System for Downlink Signal Reception and Interference Cancelling for Through-the-Earth Communication

Zhao¹,

Jiang²,

Zhang³

et al. 2016

Journal of Magnetics

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“…Some analytical formulae are proposed in order to dimension the system in very limited cases. In Grosz and Paperno (2012), the authors present the design of a low-frequency induction magnetometer, their assumption being that the impedance of the coil is simply equal to its resistance.…”

Section: Introductionmentioning

confidence: 99%

New ferromagnetic core shapes for induction sensors

Coillot

Moutoussamy

Boda

et al. 2014

J. Sens. Sens. Syst.

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Abstract. Induction sensors are used in a wide range of scientific and industrial applications. One way to improve these is rigorous modelling of the sensor combined with a low voltage and current input noise preamplifier aiming to optimize the whole induction magnetometer. In this paper, we explore another way, which consists in the use of original ferromagnetic core shapes of induction sensors, which bring substantial improvements. These new configurations are the cubic, orthogonal and coiled-core induction sensors. For each of them we give modelling elements and discuss their benefits and drawbacks with respect to a given noise-equivalent magnetic induction goal. Our discussion is supported by experimental results for the cubic and orthogonal configurations, while the coiled-core configuration remains open to experimental validation. The transposition of these induction sensor configurations to other magnetic sensors (fluxgate and giant magneto-impedance) is an exciting prospect of this work.

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“…The waveguide techniques significantly reduce the path loss, and hence increases the communication range compared to ordinary MI systems and EM wave systems [18]. The additional method to increase the communication range, without increasing transmitting power, is improving the sensitivity of the receiver [19][20][21][22][23][24]. These works focus on general search coil magnetometers, but their results can be employed in optimal design of MI communication receivers as well.…”

mentioning

confidence: 99%

Magnetic Induction Antenna Arrays for Mimo and Multiple-Frequency Communication Systems

Tal¹,

Morag²,

Levron³

2017

PIER C

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Abstract-In magnetic induction communication systems, channel capacity is often a major bottleneck that limits the system performance. This paper proposes a method to increase the channel capacity in such systems by means of an antenna array. A central challenge in the design of magnetic antenna arrays is to achieve low intra-array coupling along with high gain. These two properties are essential for increasing the channel capacity in comparison to single antenna communication systems of comparable volume.The method proposed in this paper utilizes circular loop antennas to reduce the intra-array coupling using magnetic flux cancellation.The mathematic approach employed in this paper considers each coil as a system of coupled inductors, where each inductor is a single turn loop, and the total coil self and mutual inductances are computed by summing the appropriate single turn loop inductances. Volume efficient coil topologies are identified, and an optimization method is proposed to minimize the intra-array coupling, subject to a required inductance. The proposed method allows to design volume efficient, up to 3 × 3, array, or pyramidal shaped 4 × 4 arrays. The results are verified experimentally using the multiple-frequency communication mode.

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Analytical Optimization of Low-Frequency Search Coil Magnetometers

Cited by 41 publications

References 15 publications

Design of the Magnetic Field Sensing System for Downlink Signal Reception and Interference Cancelling for Through-the-Earth Communication

Design of the Magnetic Field Sensing System for Downlink Signal Reception and Interference Cancelling for Through-the-Earth Communication

New ferromagnetic core shapes for induction sensors

Magnetic Induction Antenna Arrays for Mimo and Multiple-Frequency Communication Systems

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