scholarly journals Effect of Parasitic Capacitance on GMI Magnetic Sensor Performance

2013 ◽  
Vol 543 ◽  
pp. 261-264 ◽  
Author(s):  
Sebastien Saez ◽  
Basile Dufay ◽  
Christophe Dolabdjian ◽  
Arthur Yelon ◽  
David Ménard
Keyword(s):  
Noise Level ◽  
Resonance Effect ◽  
Parasitic Capacitance ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Magnetic Noise ◽  
System Sensitivity ◽  
Sensor Performance ◽  
Sensor Sensitivity ◽  
Device Sensitivity

Magnetic sensors based on GMI devices are the subject of intensive research, as they appear promising for magnetometry applications. Performances of GMI magnetometers are often limited by the noise of the electronic setup. Thus, the present challenge is to increase the GMI device sensitivity (expressed in V/T) in order to decrease the equivalent magnetic noise of the system. In our previous work, we showed that the use of a pick-up coil in an off-diagonal configuration improves the magnetic sensor sensitivity and offers a promising approach for developing an inexpensive magnetometer with sub-pT/Hz equivalent magnetic noise levels. Ideally, the use of a coil increases the sensitivity linearly as a function of the number of turns. However, this effect is reduced by the parasitic capacitance of the coil. This affects the device sensitivity, noise level and system performance. The parasitic capacitance can degrade all of these, but also induces a resonance effect, which can help to optimize magnetometer sensitivity, and thus, its noise level. We analyze the effects of the parasitic capacitance on the system (sensitivity and noise) and propose optimization routes. We have obtained sensor sensitivity as high as 700 fT/Hz.

Study of GaN Dual-Drain Magnetic Sensor Performance at Elevated Temperatures

2019 ◽  
Vol 66 (4) ◽  
pp. 1937-1941 ◽  
Author(s):  
B. R. Thomas ◽  
S. Faramehr ◽  
D. C. Moody ◽  
J. E. Evans ◽  
M. P. Elwin ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Magnetic Sensor ◽  
Sensor Performance

scholarly journals Recent Progress of Fluxgate Magnetic Sensors: Basic Research and Application

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1500
Author(s):  
Songrui Wei ◽  
Xiaoqi Liao ◽  
Han Zhang ◽  
Jianhua Pang ◽  
Yan Zhou
Keyword(s):  
Recent Progress ◽  
Electronic Devices ◽  
Basic Research ◽  
Research Direction ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Future Research ◽  
Calibration Methods ◽  
Wearable Electronic ◽  
Wearable Electronic Devices

Fluxgate magnetic sensors are especially important in detecting weak magnetic fields. The mechanism of a fluxgate magnetic sensor is based on Faraday’s law of electromagnetic induction. The structure of a fluxgate magnetic sensor mainly consists of excitation windings, core and sensing windings, similar to the structure of a transformer. To date, they have been applied to many fields such as geophysics and astro-observations, wearable electronic devices and non-destructive testing. In this review, we report the recent progress in both the basic research and applications of fluxgate magnetic sensors, especially in the past two years. Regarding the basic research, we focus on the progress in lowering the noise, better calibration methods and increasing the sensitivity. Concerning applications, we introduce recent work about fluxgate magnetometers on spacecraft, unmanned aerial vehicles, wearable electronic devices and defect detection in coiled tubing. Based on the above work, we hope that we can have a clearer prospect about the future research direction of fluxgate magnetic sensor.

Improvement of the>tex<$mu $>/tex<-Hall Magnetic Sensor Sensitivity at Low Frequency

2004 ◽  
Vol 4 (1) ◽  
pp. 160-166 ◽  
Author(s):  
A. Qasimi ◽  
C. Dolabdjian ◽  
D. Bloyet ◽  
V. Mosser
Keyword(s):  
Low Frequency ◽  
Magnetic Sensor ◽  
Sensor Sensitivity

Design and Analysis of the CMOS Compatible Pressure Sensor Using Flip Chip and Flex Circuit Board Technologies

2003 ◽  
Author(s):  
Chih-Tang Peng ◽  
Chang-Chun Lee ◽  
Kuo-Ning Chiang
Keyword(s):  
Pressure Sensor ◽  
Flip Chip ◽  
Circuit Board ◽  
Packaging Design ◽  
System Sensitivity ◽  
Sensor Performance ◽  
Piezoresistive Pressure Sensor ◽  
Flip Chip Packaging ◽  
Novel Design ◽  
Packaging Effect

In this study, a silicon base piezoresistive pressure sensor using flip chip and flex circuit packaging technologies is studied, designed and analyzed. A novel designed pressure sensor using flip chip packaging with spacer is employed to substitute the conventional chip on board or SOP packaging technology. Subsequently, a finite element method (FEM) is adopted for the designing of the sensor performance. Thermal and pressure loading is applied on the sensor to study the system sensitivity as well as the thermal and packaging effect. The performance of novel packaging pressure sensor is compared with that of the conventional one to demonstrate the feasibility of this novel design. The findings depict that this novel packaging design can not only maintain well sensor sensitivity but also reduce the thermal and packaging effect of the pressure sensor.

scholarly journals Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 3001 ◽  
Author(s):  
Minoru Hayashi ◽  
Taisuke Saito ◽  
Yoshihiro Nakamura ◽  
Kenji Sakai ◽  
Toshihiko Kiwa ◽  
...  
Keyword(s):  
Steel Structures ◽  
Magnetic Sensor ◽  
Extraction Technique ◽  
Pickup Coil ◽  
Magnetic Noise ◽  
Flat Plates ◽  
Dual Channel ◽  
Deck Plate ◽  
Signal Fluctuation ◽  
Sensor Probe

Conventional eddy current testing (ECT) using a pickup coil probe is widely employed for the detection of structural cracks. However, the inspection of conventional ECT for steel structures is difficult because of the magnetic noise caused by the nonuniform permeability of steel. To combat this challenge, we have developed a small magnetic sensor probe with a dual-channel tunneling magnetoresistance sensor that is capable of reducing magnetic noise. Applying this probe to a complicated component of steel structures—such as the welds joining a U-shaped rib and deck plate together—requires the reduction of signal fluctuation caused by the distance (liftoff) variations between the sensor probe and the subject. In this study, the fundamental crack signal and the liftoff signal were investigated with the dual-channel sensor. The results showed that the liftoff signals could be reduced and differentiated from the crack signals by the differential parameters of the dual-channel sensor. In addition, we proposed an extraction technique for the crack signal using the Lissajous curve of the differential parameters. The extraction technique could be applied to the inspections not only for flat plates but also for welded angles to detect cracks without the influence of the liftoff signal.

Magnetic Sensors for Navigation Applications: An Overview

2013 ◽  
Vol 67 (2) ◽  
pp. 263-275 ◽  
Author(s):  
Wei Li ◽  
Jinling Wang
Keyword(s):  
Geomagnetic Field ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Global Navigation Satellite Systems ◽  
Satellite Systems ◽  
Current Trends ◽  
Compass Calibration ◽  
Global Navigation Satellite ◽  
Available Information ◽  
Electronic Compass

This paper reviews currently existing electronic magnetic sensor technologies for navigation applications. Magnetic compasses have been used in navigation for centuries. The Earth's geomagnetic field is considered to provide accurate, reliable and economically available information for orientation. Meanwhile, modern magnetometers and compass calibration technologies have allowed the electronic compass to become a crucial navigation tool, even in times of modern satellite navigation using Global Navigation Satellite Systems (GNSS). Magnetic sensor technologies, error modelling and compensating approaches have been reviewed in this paper. Current trends and the outlook for future development of the electronic compass are analysed.

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.

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.

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