Quantitative Nondestructive Evaluation of the Aluminum Alloy Using the Sheet Type Induced Current and the Single Sensor Scanning

2009 ◽  
Vol 417-418 ◽  
pp. 641-644 ◽  
Author(s):  
Jong Woo Jun ◽  
Jin Yi Lee ◽  
Ki Su Shin ◽  
Jung Ho Hong
Keyword(s):  
Magnetic Field ◽  
Aluminum Alloy ◽  
Vertical Direction ◽  
Crack Size ◽  
Induced Current ◽  
Paramagnetic Materials ◽  
Crack Tips ◽  
Single Sensor ◽  
The Magnetic Field ◽  
Testing And Evaluation

Single sensor scanning (hereafter SSS) used to inspect cracks on paramagnetic materials can measure the distribution of the root mean squared value (RMS) of the magnetic field around crack tips quantitatively when sheet type current is induced on the specimen. The vertical direction magnetic field alternates to the surface of the crack tips because the sheet type induced current on the specimen is distorted by the existence of the crack in an SSS system. The RMS distribution of the magnetic field, which can be measured by using SSS, depends on the crack size and shape, so it can be used to evaluate a crack size quantitatively. An algorithm of quantitative nondestructive testing and evaluation of cracks of various shapes and sizes on the aluminum alloy, Al7075 is proposed in this paper.

scholarly journals Non-magnetic generating electricity

2021 ◽  
Author(s):  
Shuai Yang
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Electric Field ◽  
Induced Current ◽  
Current Generation ◽  
Scientific Cognition ◽  
The Past ◽  
Directional Movement ◽  
Voltage Generation ◽  
The Magnetic Field

Abstract In the past scientific cognition, changes in the magnetic field produce electric field, so when there is current and voltage generation, need to have a change in magnetic flux, However, in the process of studying the nature of magnetization, we found that the microscopic formation of a magnetic field is the directional movement of positive and negative charges, under the guidance of this theory, we use other methods, realize the separation of positive and negative charges, observation of induced current generation, this can be used as another way to generate electricity.

Fraction Solid Measurements on Solidifying Melt

2004 ◽  
Vol 126 (2) ◽  
pp. 193-197 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt ◽  
Sorin G. Teodorescu
Keyword(s):  
Magnetic Field ◽  
Aluminum Alloy ◽  
Indirect Method ◽  
Eddy Currents ◽  
Solid Phase ◽  
Molten Metals ◽  
Metal Sample ◽  
Fraction Solid ◽  
The Magnetic Field ◽  
Good Agreement

A new indirect method to measure fraction solid in molten metals is presented. The method is based on the phenomena that when a metal sample (solid or liquid) rotates in a magnetic field (or the magnetic field rotates around a stationary sample), circulating eddy currents are induced in the sample, which generate an opposing torque related to amount of solid phase in a solidifying melt between the liquidus and solidus temperatures. This new technique is applied for measuring fraction solid on commercial A319 aluminum alloy. The solidification curves obtained by the proposed method at different cooling rates are in good agreement with predictions made by the Scheil model.

scholarly journals A hybrid fluxgate and search coil magnetometer concept using a racetrack core

2018 ◽  
Vol 7 (4) ◽  
pp. 265-276 ◽  
Author(s):  
David M. Miles ◽  
B. Barry Narod ◽  
David K. Milling ◽  
Ian R. Mann ◽  
David Barona ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solid Core ◽  
Proof Of Concept ◽  
Noise Performance ◽  
Hardware Complexity ◽  
Search Coil ◽  
Air Core ◽  
Single Sensor ◽  
The Magnetic Field

Abstract. A proof-of-concept hybrid magnetometer is presented, which simultaneously operates as both a fluxgate and a search coil, allowing it to sense the magnetic field from DC to 2 kHz using a single sensor. Historically, such measurements would normally require two dedicated instruments, and each would typically require deployment on its own dedicated boom as the instruments mutually interfere. A racetrack fluxgate core combined with a long solenoidal sense winding is shown to be moderately effective as a search coil magnetometer, and the search coil effect can be captured without introducing significant hardware complexity beyond what is already present in a typical fluxgate instrument. Several methods of optimising the search coil action of the hybrid instrument are compared with the best method providing sensitivity and noise performance between comparably sized traditional air-core and solid-core search coil instruments. This hybrid sensor topology should miniaturise to platforms such as CubeSats for which multiple boom-mounted instruments are generally impractical, so a single hybrid instrument providing modest, but scientifically useful, sensitivity from DC to kHz frequencies would be beneficial.

scholarly journals A Hybrid Fluxgate and Search Coil Magnetometer Concept Using a Racetrack Core

2018 ◽  
Author(s):  
David M. Miles ◽  
B. Barry Narod ◽  
David K. Milling ◽  
Ian R. Mann ◽  
David Barona ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solid Core ◽  
Proof Of Concept ◽  
Noise Performance ◽  
Hardware Complexity ◽  
Search Coil ◽  
Air Core ◽  
Single Sensor ◽  
The Magnetic Field

Abstract. A proof-of-concept hybrid magnetometer is presented which simultaneously operates as both a fluxgate and a search coil allowing it to sense the magnetic field from DC to two kHz using a single sensor. Historically, such measurements would normally require two dedicated instruments and each would typically require deployment on its own dedicated boom as the instruments mutually interfere. A racetrack fluxgate core combined with a long solenoidal sense winding is shown to be moderately effective as a search coil magnetometer and the search coil effect can be captured without introducing significant hardware complexity beyond what is already present in a typical fluxgate instrument. Several methods of optimizing the search coil action of the hybrid instrument are compared with the best providing sensitivity and noise performance between comparably sized traditional air core and solid core search coil instruments. This hybrid sensor topology should miniaturize to platforms such a CubeSats where multiple boom-mounted instruments are generally impractical so a single hybrid instrument providing modest, but scientifically useful, sensitivity from DC to kHz frequencies would be beneficial.

Fraction Solid Measurements on A319 Aluminum Alloy

2002 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt ◽  
Sorin G. Teodorescu
Keyword(s):  
Magnetic Field ◽  
Aluminum Alloy ◽  
Eddy Currents ◽  
Solid Phase ◽  
Molten Metals ◽  
Metal Sample ◽  
Fraction Solid ◽  
A New Technique ◽  
The Magnetic Field ◽  
Good Agreement

A new indirect method to measure fraction solid on molten metals is presented. The method is based on the phenomena that when a metal sample (solid or liquid) rotates in a magnetic field (or the magnetic field rotates around a stationary sample), circulating eddy currents are induced in the sample, which generate an opposing torque proportional to amount of solid phase that precipitates in a solidifying melt between the liquidus and solidus temperatures. A new technique is applied for measuring fraction solid on commercial A319 aluminum alloy. The solidification curves obtained by the proposed method at different cooling rates are in a good agreement with the predictions made by the Scheil model.

SURVEI GEOFISIKA DENGAN METODE MAGNETIK UNTUK MENGETAHUI INTRUSI BATUAN BEKU

2008 ◽  
Vol 5 (2) ◽  
Author(s):  
Khristian Enggar Pamuji
Keyword(s):  
Magnetic Field ◽  
Data Processing ◽  
Diurnal Variation ◽  
Igneous Rock ◽  
Magnetic Data ◽  
Survey Area ◽  
Central Java ◽  
Single Sensor ◽  
The Subject ◽  
The Magnetic Field

<em><span>The magnetic research had been carried out in Karangsambung, Kebumen, Central Java, for eight days. The subject of this research is mapping of the anomaly of magnetic field in the survey area Budjil mountain, that will be proceed in order to interpret the contact of the rock with surroundings area.  This measurement used two units of Proton precision Magnetometer (PPM) Model G-856, PPM with single sensor was used to measure diurnal variation and PPM double sensor (Gradiometer) that was used to measure the magnetic field meanwhile, GPS Garmin was used for the positioning.  Magnetic data processing includes IGRF correction and diurnal variation correction. After this correction has done, contouring was made using Surfer based on the total magnetic field anomaly in order to understand the occurrence of igneous rock</span></em>

scholarly journals Paramagnetic and Diamagnetic Susceptibility of Infinite Quantum Well

2020 ◽  
Vol 3 (2) ◽  
pp. 61-67
Author(s):  
Adam Badra Cahaya
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Quantum Well ◽  
Diamagnetic Susceptibility ◽  
Three Dimensional ◽  
Positive Sign ◽  
Basic Physics ◽  
Paramagnetic Materials ◽  
Quantization Formalism ◽  
The Magnetic Field

Paramagnetism and diamagnetism of a material characterized by its magnetic susceptibility. When a material is exposed to an external magnetic field, magnetic susceptibility is defined as the ratio of the induced magnetization and the magnetic field. A paramagnetic material has magnetic susceptibility with positive sign. On the other hand, a diamagnetic material has magnetic susceptibility with negative sign. Atomically, paramagnetic materials consist of atoms that has orbital with unpaired electrons. Theoretical study of paramagnetic susceptibility and diamagnetic susceptibility are well described by Pauli paramagnetism and Landau diamagnetism, respectively. Although paramagnetism and diamagnetism are among the simplest magnetic properties of material that are studied in basic physics, theoretical derivations of Pauli paramagnetic and Landau diamagnetic susceptibility require second quantization formalism of quantum mechanics. We aim to discuss the paramagnetic and diamagnetic susceptibilities for simple three-dimensional quantum well using first quantization formalism.

Magnetic Field Effect on the Natural Convection of a Liquid Metal in a Horizontal Cylinder

2013 ◽  
Author(s):  
Z. H. Wang ◽  
S. Yang ◽  
H. Chen
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Natural Convection ◽  
Liquid Metal ◽  
Horizontal Cylinder ◽  
Movement Direction ◽  
Liquid Gallium ◽  
Induced Current ◽  
Convection And Heat Transfer ◽  
The Magnetic Field

Magneto-hydrodynamic (MHD) effects are widely exploited in different industrial processes. MHD play an essential role in nuclear fusion, where it is involved in the behavior of the liquid metal alloys employed in some of the currently considered designs of tritium breeding blankets. Results of numerical simulations are presented for the natural convection of a liquid metal placed in a horizontal cylinder in the presence of a vertical magnetic field. When there is an additional magnetic field, an induced current is produced by the movement of the liquid metal in a magnetic field. Induced current and magnetic field interaction produced a Lorentz force which is opposite to the movement direction and inhibits the natural convection and heat transfer intensity. The numerical results show that the magnetic field has a observable effect at the heat transfer process of the liquid metal natural convection in a horizontal cylinder. An interesting effect of the magnetic field during the internal flow is the deceleration of the flow velocity for liquid Gallium. The magnetic field in the horizontal radial direction, which is perpendicular to the natural convection caused by the temperature gradient all the while, has the most significant influence on the natural convection, while the influence on the axial direction is comparatively weak in medium magnetic field. With the increase of the intensity of magnetic field, the inhibition is more obvious.

scholarly journals Ionospheric disturbance caused by artificial plasma clouds under different release conditions

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Xiaoli Zhu ◽  
Yaogai Hu ◽  
Zhengyu Zhao ◽  
Binbin Ni ◽  
Yuannong Zhang
Keyword(s):  
Magnetic Field ◽  
Initial Velocity ◽  
Ionospheric Disturbance ◽  
Fluid Model ◽  
Vertical Direction ◽  
Horizontal Wind ◽  
Expansion Velocity ◽  
Plasma Cloud ◽  
Artificial Plasma ◽  
The Magnetic Field

AbstractThe generation and evolution of artificial plasma clouds is a complicated process that is strongly dependent on the background environment and release conditions. In this paper, based on a three-dimensional two-species fluid model, the evolution characteristics of artificial plasma clouds under various release conditions were analyzed numerically. In particular, the effect of ionospheric density gradient and ambient horizontal wind field was taken into account in our simulation. The results show that an asymmetric plasma cloud structure occurs in the vertical direction when a nonuniform ionosphere is assumed. The density, volume, and expansion velocity of the artificial plasma cloud vary with the release altitude, mass, and initial ionization rate. The initial release velocity can change the cloud's movement and overall distribution. With an initial velocity perpendicular to the magnetic field, an O+ density cavity and two bumps exist. When there is an initial velocity parallel to the magnetic field, the generated plasma cloud is bulb-shaped, and only one O+ density cavity and one density bump are created. Compared to the cesium case, barium clouds expand more rapidly. Moreover, Cs+ clouds have a higher density than Ba+ clouds, and the snowplow effect of Cs+ is also stronger.

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