Recent Advances on Measuring and Modeling ELF-Radiated Emissions for Space Applications

2021 ◽  
pp. 1-38
Author(s):  
Christos D. Nikolopoulos
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
System Level ◽  
Space Applications ◽  
Volume Of Interest ◽  
Highly Sensitive ◽  
Wide Range ◽  
Radiated Emissions ◽  
Early Design Stages

Nowadays, a wide range of space missions accommodate ever-stricter electromagnetic cleanliness requirements arising either from the need for more precise measurements or from the implementation of highly sensitive equipment. Therefore, the establishment of a methodology that ensures the minimization of the electric and/or magnetic field in specific areas inside or outside the spacecraft structure is crucial. Towards this goal, the current chapter proposes that utilizing the results of a process completed during the early design stages of a mission, that is, the measurement and characterization of each implemented device, the desired elimination of the field can be achieved. In particular, the emerged electromagnetic signatures of the units are proven essential for the proposed methodology, which, using a heuristic approach, defines the optimal ordinance of the equipment that leads to system-level electromagnetic field minimization in the volume of interest. The dimensions of the devices and the effect of the conductive surfaces of the spacecraft's hull are also taken into account.

Aspects of Extremely Low Frequency Electric and Magnetic Cleanliness on Space Platforms

2021 ◽  
pp. 127-146
Author(s):  
Alexandra P. Mavropoulou ◽  
Alexandros D. Bechrakis Triantafyllos ◽  
Christos D. Nikolopoulos
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Low Frequency ◽  
System Level ◽  
Extremely Low Frequency ◽  
Volume Of Interest ◽  
Highly Sensitive ◽  
Wide Range ◽  
Early Design Stages

Nowadays, a wide range of space missions accommodate ever-stricter electromagnetic cleanliness requirements arising either from the need for more precise measurements or from the implementation of highly sensitive equipment. Therefore, the establishment of a methodology that ensures the minimization of the electric and/or magnetic field in specific areas inside or outside the spacecraft structure is crucial. Towards this goal, the current chapter proposes that utilizing the results of a process completed during the early design stages of a mission, that is, the measurement and characterization of each implemented device, the desired elimination of the field can be achieved. In particular, the emerged electromagnetic signatures of the units are proven essential for the proposed methodology, which, using a heuristic approach, defines the optimal ordinance of the equipment that leads to system-level electromagnetic field minimization in the volume of interest. The dimensions of the devices and the effect of the conductive surfaces of the spacecraft's hull are also taken into account.

scholarly journals Highly Sensitive Surface Acoustic Wave Magnetic Field Sensor Using Multilayered TbCo2/FeCo Thin Film

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 902 ◽  
Author(s):  
Aurelien Mazzamurro ◽  
Abdelkrim Talbi ◽  
Yannick Dusch ◽  
Omar Elmazria ◽  
Philippe Pernod ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Magnetic Field Sensor ◽  
Nanostructured Thin Film ◽  
Highly Sensitive ◽  
Magnetic Model ◽  
Field Sensor

Over the last decades, the use of Surface Acoustic Waves (SAW) has emerged as a promising technology in many applications such as filters, signal processing but also sensors. We report the fabrication and the characterization of a SAW delay line magnetic field sensor using uniaxial multi-layered 14×[TbCo2(3.7nm)/FeCo(4nm)] nanostructured thin film deposited on Y36° Lithium Niobate (Figure 1a). The sensor shows an interesting dependency to a tunable bias magnetic field with different orientations relative to the easy axis. The obtained results are well explained using an equivalent piezo-magnetic model described in a previous work.

scholarly journals Influence of Pulsed Electromagnetic Field on Plant Growth, Nutrient Absorption and Yield of Durum Wheat

2015 ◽  
Vol 7 (4) ◽  
pp. 505-509 ◽  
Author(s):  
Nikolaos KATSENIOS ◽  
Victor KAVVADIAS ◽  
Sideris THEOCHAROPOULOS ◽  
Dimitrios BILALIS ◽  
Zaharias IOANNOU ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Plant Growth ◽  
Durum Wheat ◽  
Total Nitrogen ◽  
Pulsed Electromagnetic Field ◽  
Enhanced Absorption ◽  
Wide Range ◽  
Pulsed Electromagnetic ◽  
Vigorous Plant

Researchers have adopted the use of magnetic field as a new pre-sowing, environmental friendly technique. Enhancements on plant characteristics with economic impact on producer’s income could be the future of a modern, organic and sustainable agriculture. A field experiment was established at Soil Science Institute of Athens, Lycovrissi, Greece, in the winter of 2014. Two durum wheat cultivars were used. It was a pot experiment with 6 treatments (2 cultivars with 3 magnetic field time exposure). The seeds were treated using a PAPIMI electromagnetic field generator for 0, 30 and 45 minutes one day before planting. The experiment followed a completely randomized design with six treatments and 30 replications. The aim of this study was to evaluate the positive effect of magnetic field pre-sowing treatment in a wide range of plant measurements, including yield. The influence of pulsed electromagnetic field on two varieties of durum wheat seeds showed some statistically significant differences at the 0.05 level in growth measurements, physiological measurements and root growth measurements. Plant tissue analysis showed that magnetic field treatments had higher values than control in total nitrogen, phosphorus, potassium, magnesium, copper (only MF-45), zinc (only MF-30) and boron content, although values showed statistically significant differences only in total nitrogen. The results indicate that this innovative technique can increase the yield of durum wheat, through enhanced absorption of nutrients. Pre-sowing treatment of the seeds leads to vigorous plant growth that are more productive.

Radiated Emissions and Magnetic Field Characterization of a 2-kW Electrothermal Propulsion System

2008 ◽  
Vol 50 (3) ◽  
pp. 466-475 ◽  
Author(s):  
Alexander L. Bogorad ◽  
Justin J. Likar ◽  
Matthew P. Deeter ◽  
Kevin A. August ◽  
Graham P. Doorley ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Propulsion System ◽  
Radiated Emissions ◽  
Electrothermal Propulsion

Thin-skin electromagnetic fields in the neighbourhood of surface-breaking cracks in metals

1991 ◽  
Vol 434 (1892) ◽  
pp. 587-603 ◽  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Free Space ◽  
Skin Depth ◽  
Rectangular Slot ◽  
Numerical Predictions ◽  
First Case ◽  
Wide Range ◽  
Thin Skin ◽  
The Magnetic Field

Electromagnetic non-destructive evaluation techniques are widely used to detect and size surface-breaking cracks in metal structures and components. The precise distribution of the electromagnetic field around such a crack depends on the frequency of the applied field, the material properties of the metal and the crack geometry. In many situations, the skin depth of the electromagnetic field in the metal is small compared with the crack dimensions. If this is the case, the crucial parameter that determines the way the electromagnetic field in air couples to the field in the metal is m = μ 0 l / μδ , where μ and μ 0 are the metal and free space permeabilities respectively and l / δ is the ratio of the crack length scale l to the skin depth δ . If the metal is ferromagnetic, m can take a wide range of values and the distribution of the electromagnetic field around the crack is very different in the two limiting cases m = 0 and m ≫ 1. In the first case, the magnetic flux emerging from the crack is directed into the metal surface whereas in the second case, the flux is directed into free space. In this work, the distribution of the electromagnetic field around a surface-breaking crack is determined for arbitrary values of m . The theory is developed for cracks of general shape and numerical calculations of the free-space components of the magnetic field are made for rectangular and semi-elliptical shaped cracks. The numerical predictions are found to be in good agreement with experimental measurements of the magnetic field above a rectangular slot, cut in a flat plate of mild steel.

Monte Carlo calculation of the energy parameters and spatial distribution of the cathodic arc ions while passing through the macro-particles filters

2018 ◽  
Vol 1 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Alexey Chernogor ◽  
Igor Blinkov ◽  
Alexey Volkhonskiy
Keyword(s):  
Magnetic Field ◽  
Mass Transfer ◽  
Monte Carlo ◽  
Monte Carlo Calculation ◽  
Inhomogeneous Magnetic Field ◽  
Flow Energy ◽  
Wide Range ◽  
Field Concentrator ◽  
Cathodic Arc ◽  
The Magnetic Field

The flow, energy distribution and concentrations profiles of Ti ions in cathodic arc are studied by test particle Monte Carlo simulations with considering the mass transfer through the macro-particles filters with inhomogeneous magnetic field. The loss of ions due to their deposition on filter walls was calculated as a function of electric current and number of turns in the coil. The magnetic field concentrator that arises in the bending region of the filters leads to increase the loss of the ions component of cathodic arc. The ions loss up to 80 % of their energy resulted by the paired elastic collisions which correspond to the experimental results. The ion fluxes arriving at the surface of the substrates during planetary rotating of them opposite the evaporators mounted to each other at an angle of 120° characterized by the wide range of mutual overlapping.

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