New ferromagnetic core shapes for induction sensors

Coillot, Christophe; Moutoussamy, J.; Boda, Mathieu; Leroy, Philippe

doi:10.5194/jsss-3-1-2014

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…Because the effective permeability is integral in determining the sensitivity and noise level of a search coil magnetometer, a number of efforts have been made to develop unique core shape and designs to increase search coil performance [ Coillot et al ., , ]. A recent example of this effort is the search coils flown on the MMS spacecraft [ Le Contel et al ., ], which employ magnetic concentrators at the end of their ferromagnetic core to increase the effective permeability.…”

Section: Search Coil Magnetometer Design Considerationsmentioning

confidence: 99%

“…These allocation limitations and science requirements lead to an optimized search coil design with a triaxial sensor configuration located on a boom 4 m from the spacecraft and the preamplifier box mounted on the spacecraft near the base of the boom. Each sensor consists of a 10 cm long core shaped in a way to produce magnetic amplification [ Coillot et al ., , ]. The coils contain of over 10,000 turns of wire, and a flux feedback winding is used to flatten the output response of the sensor.…”

Section: Examples Of Space‐based Search Coil Magnetometersmentioning

confidence: 99%

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Spaced‐based search coil magnetometers

Hospodarsky

2016

JGR Space Physics

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Search coil magnetometers are one of the primary tools used to study the magnetic component of low‐frequency electromagnetic waves in space. Their relatively small size, mass, and power consumption, coupled with a good frequency range and sensitivity, make them ideal for spaceflight applications. The basic design of a search coil magnetometer consists of many thousands of turns of wire wound on a high permeability core. When a time‐varying magnetic field passes through the coil, a time‐varying voltage is induced due to Faraday's law of magnetic induction. The output of the coil is usually attached to a preamplifier, which amplifies the induced voltage and conditions the signal for transmission to the main electronics (usually a low‐frequency radio receiver). Search coil magnetometers are usually used in conjunction with electric field antenna to measure electromagnetic plasma waves in the frequency range of a few hertz to a few tens of kilohertzs. Search coil magnetometers are used to determine the properties of waves, such as comparing the relative electric and magnetic field amplitudes of the waves, or to investigate wave propagation parameters, such as Poynting flux and wave normal vectors. On a spinning spacecraft, they are also sometimes used to determine the background magnetic field. This paper presents some of the basic design criteria of search coil magnetometers and discusses design characteristics of sensors flown on a number of spacecraft.

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Section: Search Coil Magnetometer Design Considerationsmentioning

confidence: 99%

Section: Examples Of Space‐based Search Coil Magnetometersmentioning

confidence: 99%

Spaced‐based search coil magnetometers

Hospodarsky

2016

JGR Space Physics

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“…Yan et al [6] proposed two different optimization method considering given volume and ferromagnetic core. Coillot et al [7] optimized the magnetometer in aspect of ferromagnetic core. In our optimization system, considering the sensitivity, bandwidth, weight and volume of the inductive coil, the winding diameter, the number of turns and the equivalent diameter of the ferromagnetic core are optimized simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Search Coil Magnetometer Based on Multi-parameter Joint Optimization Design in Ultra Low-Frequency Communication

Li¹,

Jiang²,

Yang³

et al. 2018

JMAG

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In order to design a kind of high-sensitive, narrow-band and portable search coil magnetometer, based on the principle of magnetic measuring, an equivalent model of search coil magnetometer with parallel matched capacitor is established. The formula of the induced coil is derived, low-noise integrated operational amplifier is designed and made as the preamplifier circuit of search coil magnetometer. The parameters of the inductive coil based on multi-parameter joint optimization are obtained under consideration of the sensitivity, bandwidth, weight and volume of the inductive coil simultaneously. The search coil magnetometer test is completed in the electromagnetic shielding room. And the result shows that the sensitivity of the designed search coil magnetometer is 40 fT/ @80 Hz, under the precondition of guaranteeing the weight, volume and bandwidth, which is basically the same as that of the simulation.

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“…Yan et al [2] proposed two different optimization schemes in consideration of the volume of the coil and magnetic core. Coillot et al [3] optimized inductive magnetometer by adopting ferromagnetic cores with different shapes. Besides, Shao et al used high-resistivity laminated magnetic cores and magnetic flux collectors on both sides of the magnetic core to increase the effective area and the effective permeability of the magnetic core so as to improve the sensitivity of the sensor, developing magnetic sensors with a wide range of frequency [4].…”

Section: Introductionmentioning

confidence: 99%

Interference Suppression Algorithm Based on Analog Circuits Combined With Transform Algorithm in Elf Communication

Li¹,

Jiang²,

Liu³

et al. 2018

PIER M

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In order to effectively improve the communication quality in the extremely-low frequency (ELF) communication, a whole model of analog circuits and transform domain algorithm is constructed. Analog circuits include a pair of magnetic antennas, an amplifier and a group of filters. The distributed capacitance of the magnetic antenna is effectively reduced by the segmented winding method. Analog circuits used to amplify and filter received signal are designed. Besides, a magnetic sensor with high sensitivity is produced. The Karhunen-Loève transform (KLT) algorithm applied to the field of interference suppression is deduced in detail. The transform successfully passes the received signal along the basis vector in sub-band, but the interference signal along the vector is attenuated. Therefore, the problem of an optimal filter is converted into the solution of transform factor for each sub-band. Then the relationship between the KLT transform and the time domain algorithm in the interference suppression problem is given. Based on the KLT algorithm, Fourier transform (FT) that makes the correlation matrices of the received signal diagonalized approximately is applied to the interference suppression algorithm. Based on the deduction results, the final optimal filter expressions are basically the same as the KLT algorithm. Finally, the experiments are carried out by using the simulated signal and real collected data in the laboratory, respectively. The schematic diagram of the real collected device is presented. The experimental result shows that, no matter the analog signal or the real collected data, the proposed algorithm can effectively suppress the interference. For the simulation, the performance of KLT algorithm is basically same as that of FT algorithm, but KLT algorithm is obviously better than FT algorithm for real collected data.

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New ferromagnetic core shapes for induction sensors

Cited by 9 publications

References 20 publications

Spaced‐based search coil magnetometers

Spaced‐based search coil magnetometers

Search Coil Magnetometer Based on Multi-parameter Joint Optimization Design in Ultra Low-Frequency Communication

Interference Suppression Algorithm Based on Analog Circuits Combined With Transform Algorithm in Elf Communication

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