scholarly journals Novel Giant Magnetoimpedance Magnetic Field Sensor

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 691 ◽  
Author(s):  
Piotr Gazda ◽  
Roman Szewczyk
Keyword(s):  
Amorphous Alloys ◽  
Parameters Optimization ◽  
Zero Field ◽  
The Novel ◽  
Temperature Drift ◽  
Prototype Test ◽  
Measurement Principle ◽  
Field Sensor ◽  
Compensation Field ◽  
Compensation Measurement

The idea, design, and tests of the novel GMI sensor are presented, based on the compensation measurement principle, where the local ‘zero-field’ minimum of the double-peak characteristic was utilized as a sensitive null detector. The compensation field was applied in real-time with the help of microprocessor-based, two-step, quasi-Newtonian optimization. The process of material parameters optimization through Joule-annealing of chosen amorphous alloys is described. The presented results of the prototype test unit show linear output characteristic, low measurement uncertainty, and resistance against time and temperature drift.

scholarly journals Towards the non-zero field cesium magnetic sensor array for magnetoencephalography

2021 ◽  
Author(s):  
Mikhail Petrenko ◽  
Sergei Dmitriev ◽  
Anatoly Pazgalev ◽  
Alex Ossadtchi ◽  
Anton Vershovskii
Keyword(s):  
Information Transfer ◽  
Sensor Array ◽  
Response Speed ◽  
Magnetic Sensors ◽  
Zero Field ◽  
Optically Pumped ◽  
Noise Spectral Density ◽  
Information Transfer Rate ◽  
Field Sensor ◽  
Better Than

Magnetic sensors developed for application in magnetoencephalography must meet a number of requirements; the main ones are compactness, sensitivity and response speed. We present a quantum optically pumped atomic sensor with cell volume of 0.5cm<sup>3</sup> that meets these requirements and is operable in nonzero magnetic fields. The ultimate sensitivity of the sensor was estimated as (using the criteria of the ratio of the slope of the magnetic resonance signal to the shot noise spectral density) to be better than 5 fT/Hz<sup>1/2</sup>. The actual sensitivity, measured in a gradiometric scheme, reaches 13 fT/Hz<sup>1/2 </sup>per sensor. We also present a novel and fast algorithm for optimization of the geometric properties of non-zero field sensor array with respect to maximization of the information transfer rate for cortical sources.<br>

scholarly journals Low-Offset In-Plane Sensitive Hall Arrangement

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 713
Author(s):  
Siya Lozanova ◽  
Ivan Kolev ◽  
Avgust Ivanov ◽  
Chavdar Roumenin
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Output Voltage ◽  
Cross Coupling ◽  
The Novel ◽  
Temperature Drift ◽  
Low Offset ◽  
First Time ◽  
Single Configuration ◽  
Hall Elements

A novel in-plane sensitive Hall arrangement consisting of two identical n-Si three-contact (3C) elements and realized in a common technological process, is presented. In the solution, the minimization of the offset and its temperature drift is achieved by cross-coupling of the outer device contacts. This terminals’ connection provides equalizing currents between the two substrates which strongly compensate the inevitable difference in the electrical conditions in the two parts of the arrangement. As a result, the residual offset of both integrated Hall elements at the output Vout(0) and its temperature drift are strongly minimized. The residual offset is about 160 times smaller than the single-configuration one. The obtained output voltage-to-residual offset ratio at sensitivity of SRI ≈ 98 V/AT is very promising, reaching 6 × 103 at temperature T = 40 °C and induction 1 T. As a result, increased metrological accuracy for numerous applications is achieved. For a first time through the novel arrangement a suppression of sensitivity in the presence of external magnetic field could be achieved in order to obtain permanent offset information. This is one of the key results in the Hall device investigation.

scholarly journals Investigation of a low-cost magneto-inductive magnetometer for space science applications

2017 ◽  
Author(s):  
Leonardo H. Regoli ◽  
Mark B. Moldwin ◽  
Matthew Pellioni ◽  
Bret Bronner ◽  
Kelsey Hite ◽  
...  
Keyword(s):  
Power Consumption ◽  
Linear Response ◽  
Low Cost ◽  
Magnetic Sensors ◽  
Low Power Consumption ◽  
The Novel ◽  
Noise Floor ◽  
Recent Developments ◽  
Measurement Principle ◽  
Low Amplitude

Abstract. A new sensor for measuring low-amplitude magnetic fields that is ideal for small spacecraft is presented. The novel measurement principle enables the fabrication of a low-cost sensor with low power consumption and with measuring capabilities that are comparable to recent developments for CubeSat applications. The current magnetometer, a software-modified version of a commercial sensor, is capable of detecting fields with amplitudes as low as 8.7 nT at 40 Hz and 2.7 nT at 1 Hz, with a noise floor of 500 pT/√(Hz) @ 1 Hz. The sensor has a linear response to less than 3 % over a range of ±100 000 nT. All of these features make the magneto-inductive principle a promising technology for the development of magnetic sensors for both space-borne and ground-based applications to study geomagnetic activity.

Characterization and Quick Screening Methodology of Novel Alloys for Biomedical Applications Using Filtered Cathodic Vacuum Arc Deposited Thin Film

2018 ◽  
Vol 283 ◽  
pp. 78-87
Author(s):  
Saran Tantavisut ◽  
Boonrat Lohwongwatana ◽  
Atchara Khamkongkaeo ◽  
Suparat Bootchai ◽  
Pairat Tangpornprasert ◽  
...  
Keyword(s):  
Thin Film ◽  
Amorphous Alloys ◽  
Biomedical Applications ◽  
Toxic Elements ◽  
Vacuum Arc ◽  
Induction Melting ◽  
The Novel ◽  
Cover Glass ◽  
Glass Slides ◽  
Filtered Cathodic Vacuum Arc

Ti-based amorphous alloys containing no harmful elements are desired. However, many Ti-based amorphous alloys contain toxic elements such as Al, Ni, V and Be. The presence of toxic elements within amorphous alloys is a concern when they are intended for use as a biomaterial. This problem has steered many researchers toward the development of Ti-based amorphous alloys without toxic elements. Our novel amorphous alloys were developed based on this principle. A series of Ti44Zr10Pd10Cu6+xCo23-xTa7 (x = 0, 4, 8) amorphous alloys were developed for biomedical application. A series of protocol tests were performed to check for biocompatibility and potential use of the novel alloys in humans. First, alloy ingots were alloyed by induction melting and then cast into copper molds. The cast rod was then used as the plasma cathode in a filtered cathodic vacuum arc deposition chamber to coat the 25-nm amorphous alloy thin film on the cover glass slides. These coated cover glass slides were then examined for biocompatibility. Cell proliferation and cell differentiation were investigated using Methylthiazol Tetrazolium assay test and by alkaline phosphatase assay on osteoblast like cells (SaOS-2), respectively. Field emission scanning electron microscopy was performed to evaluate the thin film surface characteristics. The thickness of thin film was analyzed using a Stylus profilometer. An adhesion scratch test was administered to evaluate the thin film adhesive strength and indirect hardness comparison. Electron Dispersive X-ray Spectrometry was performed to study the elemental composition. Lastly, a medical grade Ti-6Al-4V alloy was studied in parallel as a control material. Results indicated that all investigated Ti-based amorphous alloys were non-cytotoxic and were comparable to the Ti-6AL-4V. They also demonstrated an ability to support differentiation of osteoblast like cells. The adhesion and the hardness of the thin films on the substrates were superior to that of Ti-6Al-4V. The results suggested that the novel alloys in this study could be potentially utilized in biomedical applications.

scholarly journals Method for Localization Aerial Target in AC Electric Field Based on Sensor Circular Array

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1585
Author(s):  
Wenbin Zhang ◽  
Peng Li ◽  
Nianrong Zhou ◽  
Chunguang Suo ◽  
Weiren Chen ◽  
...  
Keyword(s):  
Electric Field ◽  
Localization Error ◽  
Circular Array ◽  
Distance Error ◽  
Electric Field Sensors ◽  
Safety Distance ◽  
Electric Field Sensor ◽  
Ac Electric Field ◽  
Measurement Principle ◽  
Field Sensor

The traditional method of using electric field sensors to realize early warning of electric power safety distance cannot measure the distance of dangerous sources. Therefore, aiming at the electric field with a frequency of 50 to 60 Hz (AC electric field), a new method for localization of aerial AC target by the capacitive one-dimensional spherical electric field sensor circular array is studied. This method can directly calculate the distance, elevation, and azimuth of the detector from the dangerous source. By combining the measurement principle of the spherical electric field sensor and the plane circular array theory, a mathematical model for the localization of aerial targets in an AC electric field is established. An error model was established using Gaussian noise and the effects of different layout parameters on the localization error were simulated. Based on mutual interference between sensors, minimum induced charge, and localization error, an optimal model for sensor layout was established, and it was solved by using genetic algorithms. The optimization results show that when the number of sensors is 4, the array radius is 20 cm, and the sensor radius is 1.5 cm, the ranging error is 8.4%. The detector was developed based on the layout parameters obtained from the optimization results, and the localization method was experimentally verified at 10 and 35 kV alarm distances. The experimental results show that when the detector is located at 10 kV alarm distance, the distance error is 0.18 m, the elevation error is 6.8°, and the azimuth error is 4.57°, and when it is located at 35 kV alarm distance, the distance error is 0.2 m, the elevation error is 4.8°, and the azimuth error is 5.14°, which meets the safety distance warning requirements of 10 and 35 kV voltage levels.

Structural Modification in Amorphous Magnetic Alloys Under Thermotreatment

1995 ◽  
Vol 400 ◽  
Author(s):  
Leonid V. Poperenko ◽  
Mykola V. Vinnichenko ◽  
Vasyl’ V. Vovchak ◽  
Iryna V. Yurgelevych ◽  
Sergei G. Zaichenko
Keyword(s):  
Amorphous Alloys ◽  
Angle Of Incidence ◽  
The Novel ◽  
Structural Anisotropy ◽  
Magnetic Alloys ◽  
Structural Modifications ◽  
Principal Angle ◽  
Observed Behaviour ◽  
The Relationship ◽  
Atomic And Electronic Structure

AbstractThe experimental results of research of structural modifications in amorphous magnetic alloys (AMAs) under thermotreatment obtained by angular and spectroellipsometric methods are presented and discussed. The ductile-brittle transition was observed for the ribbons of some 3d-metal-based amorphous alloys. The relationship between the principal angle of incidence φ0 and annealing temperature Ta of alloys was obtained for the ribbons of AMAs. The observed behaviour of φ0 is connected with appearance of the novel amorphous phase’s clusters inside the surface’s layers of alloys.The influence of melt’s overheating on the atomic and electronic structure of AMAs was studied. It was found that the increase of melt’s overheating temperature leads to the decrease of absorption index within the whole spectral range (ħω=0.5–4.38 eV). The structural anisotropy of AMAs and its changes after annealings were determined by reflectometric and ellipsometric measurements.

Development of a compact double-disk magneto-rheological fluid brake

Robotica ◽  
2007 ◽  
Vol 25 (4) ◽  
pp. 493-500 ◽  
Author(s):  
Wei Zhou ◽  
Chee-Meng Chew ◽  
Geok-Soon Hong
Keyword(s):  
Circuit Design ◽  
Simple Structure ◽  
Structural Parameters ◽  
Parameters Optimization ◽  
The Novel ◽  
Element Analysis ◽  
Mr Fluid ◽  
Torque Transmission ◽  
Radial Dimension ◽  
Magneto Rheological

SUMMARYThis paper describes the development of a novel compact magneto-rheological (MR) fluid brake with high transmitted torque and a simple structure. The MR fluid brake has two shearing disks with an electromagnetic coil located between them. Such a structure enables the brake to have a small radial dimension and a large torque transmission capacity. In the design process, a Bingham viscoplastic model is used to predict the transmitted torque. Electromagnetic finite element analysis (FEA) is performed to assist the magnetic circuit design and structural parameters' optimization. The novel brake design is prototyped and studied. Experimental results show that a compact MR fluid brake with high transmitted torque is successfully achieved.

scholarly journals Towards the non-zero field cesium magnetic sensor array for magnetoencephalography

2021 ◽  
Author(s):  
Mikhail Petrenko ◽  
Sergei Dmitriev ◽  
Anatoly Pazgalev ◽  
Alex Ossadtchi ◽  
Anton Vershovskii
Keyword(s):  
Information Transfer ◽  
Sensor Array ◽  
Response Speed ◽  
Magnetic Sensors ◽  
Zero Field ◽  
Optically Pumped ◽  
Noise Spectral Density ◽  
Information Transfer Rate ◽  
Field Sensor ◽  
Better Than

Magnetic sensors developed for application in magnetoencephalography must meet a number of requirements; the main ones are compactness, sensitivity and response speed. We present a quantum optically pumped atomic sensor with cell volume of 0.5cm<sup>3</sup> that meets these requirements and is operable in nonzero magnetic fields. The ultimate sensitivity of the sensor was estimated as (using the criteria of the ratio of the slope of the magnetic resonance signal to the shot noise spectral density) to be better than 5 fT/Hz<sup>1/2</sup>. The actual sensitivity, measured in a gradiometric scheme, reaches 13 fT/Hz<sup>1/2 </sup>per sensor. We also present a novel and fast algorithm for optimization of the geometric properties of non-zero field sensor array with respect to maximization of the information transfer rate for cortical sources.<br>

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