Parallel Fluxgate Magnetometers

Janošek, Michal

doi:10.1007/978-3-319-34070-8_2

Cited by 22 publications

(15 citation statements)

References 48 publications

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“…The height of the hollow cylinders is the same as the height of the wires. The mean radius of the hollow cylinders, R c , is calculated according to Equations (1) and (2), which are based on the assumption that the circle with radius R c has the same area as the red color hexagon/square shown in Figure 11a,b. The red color lines connect the centers of the wires into a single hexagonal/square "shell" of wires.…”

Section: Equivalent 2d Model For Large Wire Arraysmentioning

confidence: 99%

“…The magnetic core of these sensors is typically a permalloy (NiFe) wire with a diameter of 0.2 mm, but some fluxgates and induction sensors use core in the form of rod with length up to 1 m [1]. While wire-core fluxgates usually do not achieve the low noise and the high offset stability of ring-core fluxgate sensors made of thin tape, wire cores of Vacquier type show several fundamental advantages [2]:…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Measurement of Magnetically Soft Nanowire Arrays for Sensor Applications

Ripka

Grim

Mirzaei

et al. 2020

Sensors

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Soft magnetic wires and microwires are currently used for the cores of magnetic sensors. Due to their low demagnetization, they contribute to the high sensitivity and the high spatial resolution of fluxgates, Giant Magnetoimpedance (GMI), and inductive sensors. The arrays of nanowires can be prepared by electrodeposition into predefined pores of a nanoporous polycarbonate membrane. While high coercivity arrays with square loops are convenient for information storage and for bistable sensors such as proximity switches, low coercivity cores are needed for linear sensors. We show that coercivity can be controlled by the geometry of the array: increasing the diameter of nanowires (20 µm in length) from 30 nm to 200 nm reduced the coercivity by a factor of 10, while the corresponding decrease in the apparent permeability was only 5-fold. Finite element simulation of nanowire arrays is important for sensor development, but it is computationally demanding. While an array of 2000 wires can be still modelled in 3D, this is impossible for real arrays containing millions of wires. We have developed an equivalent 2D model, which allows us to solve these large arrays with acceptable accuracy. Using this tool, we have shown that as a core of magnetic sensors, nanowires are efficiently employed only together with microcoils with diameter comparable to the nanowire length.

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Section: Equivalent 2d Model For Large Wire Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling and Measurement of Magnetically Soft Nanowire Arrays for Sensor Applications

Ripka

Grim

Mirzaei

et al. 2020

Sensors

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“…Some of the typical features of the fluxgate sensors are high sensitivity, wide dynamic range, high resolution, low power consumption, and low cost [8][9][10][11]. The contribution of these features to its maintaining popularity is quite big.…”

Section: Local Magnetic Field Distribution Through the Magnetic Cardmentioning

confidence: 99%

Design of Fluxgate Sensors for Different Applications from Geology to Medicine

Topal

Can

Çelik

et al. 2018

J Supercond Nov Magn

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In this study, we have shown that fluxgate sensors can be used for different application areas. Alternative sensor configurations have been developed for three different application areas. These are mainly rod-and ring-type fluxgate sensors. In the first study, a measurement system with the rod-type fluxgate sensor has been developed in order to monitor the local magnetic field distributions on a magnetic tape (e.g., credit card). With this system, the magnetic recording data on the credit card were measured and imaged successfully. The second and the third application areas, which are monitoring the influence of solar storms on the earth field and heartbeat analysis of mankind, were carried out by using a ring-core fluxgate sensor geometry.

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“…This makes it challenging to filter out the second harmonic, obtain its phase and rectify it to obtain voltage proportional to the magnitude of the external field. In order to overcome this challenge two variants of the FGM, a Vacquier-type FGM, shown in Figure 2 (ai), and a ring-core FGM, shown in Figure 2 (aii), are commonly used [ 26 , 30 , 31 , 32 ]. Taking Figure 2 a into account, the wires are wound on both rods in opposite directions to each other in a Vacquier-type FGM and, similarly for a ring-core FGM, the windings are such that on one half of the core they are in the opposite direction to the other half.…”

Section: Downhole Magnetometersmentioning

confidence: 99%

Downhole Applications of Magnetic Sensors

Gooneratne

Moellendick

2017

Sensors

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In this paper we present a review of the application of two types of magnetic sensors—fluxgate magnetometers and nuclear magnetic resonance (NMR) sensors—in the oil/gas industry. These magnetic sensors play a critical role in drilling wells safely, accurately and efficiently into a target reservoir zone by providing directional data of the well and acquiring information about the surrounding geological formations. Research into magnetic sensors for oil/gas drilling has not been explored by researchers to the same extent as other applications, such as biomedical, magnetic storage and automotive/aerospace applications. Therefore, this paper aims to serve as an opportunity for researchers to truly understand how magnetic sensors can be used in a downhole environment and to provide fertile ground for research and development in this area. A look ahead, discussing other magnetic sensor technologies that can potentially be used in the oil/gas industry is presented, and what is still needed in order deploy them in the field is also addressed.

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Parallel Fluxgate Magnetometers

Cited by 22 publications

References 48 publications

Modelling and Measurement of Magnetically Soft Nanowire Arrays for Sensor Applications

Modelling and Measurement of Magnetically Soft Nanowire Arrays for Sensor Applications

Design of Fluxgate Sensors for Different Applications from Geology to Medicine

Downhole Applications of Magnetic Sensors

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