scholarly journals AC Magnetic sensor to measure mega-amps current and kilo-tesla magnetic fields up to gigahertz frequencies

2020 ◽  
Vol 1 (1) ◽  
pp. 36-44
Author(s):  
Javier Lopez Segura ◽  
Nicolas Urgoiti
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
High Speed ◽  
High Strength ◽  
Simulation Software ◽  
Alpha Particles ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Design Build ◽  
Z Pinch

An AC magnetic sensor is presented for measuring the high speed and high strength magnetic field generated in Z-pinch fusion machines. The proposed magnetic sensor provides the measurement of magnetic fields across a broadband frequency range. The simulation of magnetic probe is presented using a SPICE simulation software LTspice. The magnetic sensors are installed in a Pulsotron-3 Z-pinch machine and measured performance of the sensor are presented. This sensor also can be used to check the ignition conditions of the Z-Pinch by measuring the magnetic field generated by the output streams of large number of reacted alpha particles. The equations for measuring non-stationary magnetic field due to rapidly varying electric currents and a LTspice simulation file are provided to help the engineers to design, build, and install this kind of sensors.

Shielding of Directional Magnetic Sensor Readings in a Measurement While Drilling Tool for Oil Well Positioning

2005 ◽  
Vol 128 (4) ◽  
pp. 343-345 ◽  
Author(s):  
Per A. Amundsen ◽  
Torgeir Torkildsen ◽  
Arild Saasen
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Materials ◽  
Explicit Solution ◽  
Drilling Fluid ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Oil Well ◽  
Drilling Tool ◽  
Measurement While Drilling

Magnetic materials in the drilling fluid used for drilling a petroleum well can significantly shield the Earth’s magnetic field as measured by magnetic sensors inside the drilling pipe. This has been shown to sometimes cause significant errors in the accuracy of borehole positioning using magnetic surveying. In this paper we present a physical approach for correcting the measured magnetic fields for such shielding. An explicit solution of the shielding problem is derived for the simplest case of a magnetic sensor on the axis of the borehole.

scholarly journals The Effect of Arrive Angle of External Magnetic Field on The Shape of Hysteresis Curve Permalloy Ni80Fe20 By Simulation

2021 ◽  
Vol 4 (2) ◽  
pp. 102
Author(s):  
Merinda Lestari ◽  
Widia Nursiyanto ◽  
Agung Tjahjo Nugroho
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Finite Difference ◽  
Coercive Field ◽  
Incident Angle ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Hysteresis Curve ◽  
Angle Of Incidence ◽  
Angle Variation

Magnetic sensor is a type of sensor that utilizes changes in resistance caused by changes in the magnetic field H or B. One of the suitable magnetic materials to be used as a study material for making magnetic sensors is permalloy Ni80Fe20. The reading error of the magnetic sensor of the Ni80Fe20 permalloy material affects hysteresis curve of the material and requires correction of the angle of incidence of the external magnetic field in order to provide accurate results on the storage media. In this our current research using Finite Difference OOMMF, we investigated the effect of the angle of incidence of the external magnetic field (H) on the hysteresis curve was carried out on an application based on. The research was conducted by reviewing the parameter literature of the Ni80Fe20 permalloy material and then compiling it in a script and simulating it on an application based on Finite Difference OOMMF. The data obtained from the simulation are normalized magnetization (m), external magnetic field H and coercivity field (Hc) which have been influenced by the angle of incidence. The results of the hysteresis curve at a size of 5 nm with a variation of the angle of incidence 0o are indicated by the value of the external magnetic field H of 10000 mT to -10000 mT with a coercive field Hc of 5000 mT to -5000 mT. The normalized magnetization value m is 1 to -1. The variation of the angle of incidence of 30o produces a coercive field Hc of -108.3 mT to 108.3 mT and a normalized magnetization of 0.86 to -0.86. The 45o incident angle variation produces a coercive field Hc -88.4 mT to 88.4 mT and a normalized magnetization of -0.7 to 0.7

scholarly journals Indoor Positioning Using Magnetic Fingerprint Map Captured by Magnetic Sensor Array

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5707
Author(s):  
Ching-Han Chen ◽  
Pi-Wei Chen ◽  
Pi-Jhong Chen ◽  
Tzung-Hsin Liu
Keyword(s):  
Magnetic Field ◽  
Sensor Array ◽  
Probabilistic Neural Network ◽  
Indoor Positioning ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Positioning System ◽  
Positioning Accuracy ◽  
Positioning Method ◽  
The Magnetic Field

By collecting the magnetic field information of each spatial point, we can build a magnetic field fingerprint map. When the user is positioning, the magnetic field measured by the sensor is matched with the magnetic field fingerprint map to identify the user’s location. However, since the magnetic field is easily affected by external magnetic fields and magnetic storms, which can lead to “local temporal-spatial variation”, it is difficult to construct a stable and accurate magnetic field fingerprint map for indoor positioning. This research proposes a new magnetic indoor positioning method, which combines a magnetic sensor array composed of three magnetic sensors and a recurrent probabilistic neural network (RPNN) to realize a high-precision indoor positioning system. The magnetic sensor array can detect subtle magnetic anomalies and spatial variations to improve the stability and accuracy of magnetic field fingerprint maps, and the RPNN model is built for recognizing magnetic field fingerprint. We implement an embedded magnetic sensor array positioning system, which is evaluated in an experimental environment. Our method can reduce the noise caused by the spatial-temporal variation of the magnetic field, thus greatly improving the indoor positioning accuracy, reaching an average positioning accuracy of 0.78 m.

Vehicle Detection and Monitoring Setup Based on Anisotropic Magnetoresistance Sensors

2014 ◽  
Vol 605 ◽  
pp. 625-628
Author(s):  
N. Hadjigeorgiou ◽  
D. Kossivakis ◽  
P. Skafidas
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Vehicle Detection ◽  
Magnetic Sensors ◽  
Anisotropic Magnetoresistance ◽  
The Creation ◽  
The Magnetic Field

The evolution in microelectronics and microarchitecture lead to the creation of cheap and reliable embedded magnetic sensors. Anisotropic Magnetoresistors (AMR), being able to measure one axis magnetic fields, have been employed in many applications so far. In this paper AMR sensor (HMC2003) manufactured by Honeywell Inc. was tested for its ability to detect the magnetic field of a vehicle. Two different sensor topologies were examined regarding their performance in vehicle detection and monitoring.

scholarly journals 21. On the magnetic fields in interstellar space and in nebulae

1958 ◽  
Vol 6 ◽  
pp. 182-192
Author(s):  
G. A. Shajn
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
High Speed ◽  
Interstellar Space ◽  
Galactic Rotation ◽  
High Electrical Conductivity ◽  
Considerable Decrease ◽  
Electrically Conductive ◽  
Filamentary Structure ◽  
The Magnetic Field

Some aspects of the problem of magnetic fields in the interstellar space and in the nebulae are discussed in this paper. Our observational basis are the numerous photographs of the nebulae in Hα and other rays, taken with high-speed 450 and 640 mm cameras.The greatly elongated shape of many emission nebulae is interpreted as a result of three factors, the effect of the magnetic field, the macroscopic motions in these nebulae (including the tendency to expand) and the high electrical conductivity of matter. The expansion of nebulae is to be generally accompanied by the considerable decrease in brightness (roughly about d–5), but if the expansion is only in one direction, owing to the presence of a regular magnetic field, the brightness decreases much more slowly (roughly about d–2) and the nebulae remain visible for a longer time. The filamentary structure, which is very often inherent to the elongated nebulae, is, probably, an additional factor of a longer visibility of the nebulae under consideration. The great lengthening of nebulae may be reached in the period of the order of 106 years.In the dark nebulae the matter seems to be electrically conductive and the macroscopic motions of the order of 1–2 km/sec are present there, so that there are reasons to suggest that the magnetic field is also responsible for the elongated shape of many dark nebulae. One may prove that the observed elongated shape of dark and emission nebulae could not be caused by differential galactic rotation.

Nature-inspired position determination using inherent magnetic fields

TECHNOLOGY ◽  
2014 ◽  
Vol 02 (02) ◽  
pp. 161-170 ◽  
Author(s):  
Saber Taghvaeeyan ◽  
Rajesh Rajamani
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Measurement System ◽  
Internal Combustion Engines ◽  
Magnetic Sensor ◽  
Field Variation ◽  
Position Measurement ◽  
Hydraulic Cylinders ◽  
Accurate Position ◽  
Field Lines

Many creatures in nature, including butterflies, newts, and mole rats, use the Earth's inherent magnetic field for navigation. They use magnetic field lines and variations in field intensity to determine their geographical position. This paper seeks to apply similar techniques to measure the positions of individual ferromagnetic objects found all around us in everyday life. Ferromagnetic objects have inherent magnetic fields around them. We show here that the magnetic field variation around a ferromagnetic object can be modeled using purely the geometry of the object under consideration. By exploiting this model, the position of the object can be measured quite accurately using a small inexpensive magnetic sensor. Further, the use of just one additional redundant magnetic sensor can eliminate the need to calibrate the position measurement system. As demonstrated in the paper through a series of experimental results, the developed measurement system is applicable to accurate position measurement of small and large ferromagnetic objects, including cars on highways, oscillating pistons in internal combustion engines, pneumatic cylinders, hydraulic cylinders, as well as moving parts in many machines.

scholarly journals Imperceptible magnetic sensor matrix system integrated with organic driver and amplifier circuits

2020 ◽  
Vol 6 (4) ◽  
pp. eaay6094 ◽  
Author(s):  
M. Kondo ◽  
M. Melzer ◽  
D. Karnaushenko ◽  
T. Uemura ◽  
S. Yoshimoto ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Real Time ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Shift Register ◽  
Physical Interaction ◽  
Matrix System ◽  
Position Sensing ◽  
The Matrix ◽  
Time Encoding

Artificial electronic skins (e-skins) comprise an integrated matrix of flexible devices arranged on a soft, reconfigurable surface. These sensors must perceive physical interaction spaces between external objects and robots or humans. Among various types of sensors, flexible magnetic sensors and the matrix configuration are preferable for such position sensing. However, sensor matrices must efficiently map the magnetic field with real-time encoding of the positions and motions of magnetic objects. This paper reports an ultrathin magnetic sensor matrix system comprising a 2 × 4 array of magnetoresistance sensors, a bootstrap organic shift register driving the sensor matrix, and organic signal amplifiers integrated within a single imperceptible platform. The system demonstrates high magnetic sensitivity owing to the use of organic amplifiers. Moreover, the shift register enabled real-time mapping of 2D magnetic field distribution.

Biaxial FBAR Magnetic Sensor Based on Fe80Ga20 Anisotropic ΔE Effect

2021 ◽  
Author(s):  
Xiaofan Yun ◽  
Wenkui Lin ◽  
Rui Hu ◽  
Xiaoyi Wang ◽  
Zhongming Zeng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Resonant Frequency ◽  
Acoustic Resonator ◽  
Magnetic Sensor ◽  
Consumer Electronics ◽  
Magnetic Sensors ◽  
Linear Temperature ◽  
Out Of Plane ◽  
Film Bulk ◽  
Δe Effect

Abstract With the increasing application of personal navigation system in consumer electronics, the demand for multi-axis magnetic sensors based on MEMS is growing. We report a biaxial MEMS DC magnetic sensor consisting of an Mo/AlN/Fe80Ga20 film bulk acoustic resonator (FBAR), with anisotropy ΔE effect-based sensing principle. Different from the previously reported one-dimensional magnetic sensor based on the ΔE effect, the anisotropic ΔE effect was used to realize in-plane and out-of-plane two-dimensional magnetic field responses on a discrete sensor, and the sensor had two readout methods: resonant frequency f and return loss S11. The magnetic sensor realized the resonant frequency f shifted by 1.03 MHz and 0.2 MHz in the 567 Oe in-plane magnetic field and 720 Oe out-of-plane magnetic field, respectively, and the S11 changes by -30.2 dB and -0.92 dB. As the applied magnetic field increases, the -3 dB bandwidth quality factor Q3dB of the S11 curve gradually increases, and its maximum values in the in-plane and out-of-plane magnetic fields are 77143 and 1828, respectively, which reduces the detection limit of the magnetic sensor. The resonant magnetic sensor has stable high linear temperature and frequency drift characteristics, and its temperature frequency coefficient is -48.7 ppm/℃.

scholarly journals Multi-axis integrated Hall magnetic sensors

2007 ◽  
Vol 22 (2) ◽  
pp. 20-28 ◽  
Author(s):  
Radivoje Popovic ◽  
Pavel Kejik ◽  
Serge Reymond ◽  
Dragana Popovic ◽  
Marjan Blagojevic ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Flux ◽  
Field Component ◽  
Angular Position ◽  
Magnetic Sensors ◽  
Magnetic Field Component ◽  
The Magnetic Field

Conventional Hall magnetic sensors respond only to the magnetic field component perpendicular to the surface of the sensor die. Multi-axis sensing capability can be provided in the following two ways: (a) by integrating magnetic flux concentrators on the die, and (b) by using vertical Hall devices. Here we review the most important two-and three-axis integrated Hall magnetic sensors based on these concepts. Their applications include mapping of magnetic fields and sensing angular position.

scholarly journals T3073 & T3074 Test report: electric energy recovered and large magnetic field due nuclear fusions measured

2021 ◽  
Vol 1 (1) ◽  
pp. 63-69
Author(s):  
Javier Lopez Segura ◽  
Arpan Pal ◽  
Nicolas Urgoiti
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Energy Recovery ◽  
Nuclear Fusion ◽  
Electric Energy ◽  
Nuclear Fusion Reactor ◽  
Thermonuclear Fuel ◽  
Promising Solution ◽  
First Time ◽  
Z Pinch

The measured results of two tests T3073 and T3074 performed in 28 August, 2020 are presented in this paper. Tests are conducted in the z-pinch type nuclear fusion reactor Pulsotron-3 with the target loaded with Hydrogen-Boron (H+B11) thermonuclear fuel. A group of Energy Recovery Coils (ERCs) were mounted to recover the electric energy directly from the plasma for the first time in the world and ERCs stored the energy in several large capacitors. During the test T3073 and T3074 the energy recovery capacitors recovered 22.59% and 17.74% of the injected energy at the target. A magnetic sensor MAG-4 consisting of inductor coils and dipoles were installed in Pulsotron-3 to measure the Time Of Flight (TOF) of the plasma and the magnetic field generated due to nuclear fusion. Magnetic fields more than 4 megateslas are obtained during the two tests. It is also observed that Pulsotron-3 with the target loaded with thermonuclear fuel generated 20-34 times larger peak magnetic fields and 12-18 times larger stabilized magnetic fields compare to the tests done using unloaded target (dummy loads). In this proposed technology Pulsotron-3 utilizes thermonuclear fuel to generate clean electric power without CO2 footprint and reduce the operational cost. This industrial approach is a promising solution that can reduce world emissions to zero in less than 8 years.

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