scholarly journals Study on the Shielding Effectiveness of an Arc Thermal Metal Spraying Method against an Electromagnetic Pulse

Materials ◽  
2017 ◽  
Vol 10 (10) ◽  
pp. 1155 ◽  
Author(s):  
Han-Seung Lee ◽  
Hong-Bok Choe ◽  
In-Young Baek ◽  
Jitendra Singh ◽  
Mohamed Ismail
Keyword(s):  
Electromagnetic Pulse ◽  
Shielding Effectiveness ◽  
Metal Spraying ◽  
Spraying Method

scholarly journals Optically transparent and very thin structure against electromagnetic pulse (EMP) using metal mesh and saltwater for shielding windows

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Duy Tung Phan ◽  
Chang Won Jung
Keyword(s):  
Electromagnetic Pulse ◽  
Low Cost ◽  
High Energy ◽  
Metal Plate ◽  
Optical Transparency ◽  
Shielding Effectiveness ◽  
Concrete Wall ◽  
Metal Mesh ◽  
Wide Range ◽  
Optically Transparent

AbstractAn electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers. Generally, a metal plate placed inside a thick concrete wall is used against an EMP, but it is not suitable for an EMP shielding window, which requires not only strong shielding effectiveness (SE) but also optical transparency (OT). In this paper, we propose a very thin and optically transparent structure with excellent SE for EMP shielding window application. The proposed structure consists of a saltwater layer held between two glass substrates and two metal mesh layers on the outside of the glass, with a total thickness of less than 1.5 cm. The SE and OT of the structure are above 80 dB and 45%, respectively, which not only meet the requirement of EMP shielding for military purposes but also retain the procedure of good observation. Moreover, the OT of the structure can be significantly improved using only one metal mesh film (MMF) layer, while the SE is still maintained high to satisfy the required SE for home applicants. With the major advantages of low cost, optical transparency, strong SE, and flexible performance, the proposed structure can be considered a good solution for transparent EMP shielding windows.

Electromagnetic pulse shielding effectiveness of nickel-plated carbon fiber composites

2014 ◽  
Vol 26 (7) ◽  
pp. 73203
Author(s):  
王富强 Wang Fuqiang ◽  
闫丽丽 Yan Lili ◽  
王东红 Wang Donghong ◽  
谷建宇 Gu Jianyu
Keyword(s):  
Carbon Fiber ◽  
Electromagnetic Pulse ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Shielding Effectiveness

Simulation Study on Coupling Effect under HEMP of Shielding Control Box

2014 ◽  
Vol 551 ◽  
pp. 309-314
Author(s):  
Long Dou ◽  
Bin Chen ◽  
Hai Lin Chen ◽  
Fei Guo
Keyword(s):  
Complex System ◽  
Field Distribution ◽  
Simulation Study ◽  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Calculation Model ◽  
Shielding Effectiveness ◽  
Coupling Field ◽  
Depth Direction ◽  
Energy Pulse

The coupling effect under HEMP calculation model of the shielding control box is established with the CST software. The shielding effectiveness of the shielding control box with different incidence directions of HEMP were studied on, and the field distribution of the shielding control box was analyzed. The results show that incidence direction of HEMP in the depth direction of the gap and perpendicular to the long side of the gap can provide the worst electromagnetic pulse protection of shielding control box. The coupling field of the complex system box has resonant characters. The gap filled with conductive rubber can effectively reduce the coupling of electromagnetic energy pulse.

Effects of Aperture Amount and Offset on Couplings of Strong Electromagnetic Pulse

2011 ◽  
Vol 130-134 ◽  
pp. 1387-1390
Author(s):  
Xin Ping Zhu ◽  
Bing Cao ◽  
Cheng Long Liu
Keyword(s):  
Field Strength ◽  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Fdtd Method ◽  
Shielding Effectiveness ◽  
Actual Structure ◽  
Aperture Coupling ◽  
Coupling Mode ◽  
Aperture Arrays ◽  
Difference Time

Aperture coupling is a main coupling mode through which strong electromagnetic pulse can disturb and even damage electronic equipments. The amount, offset and mixed shape of aperture arrays can affect the coupling effect, which is analyzed using finite-difference time-domain (FDTD) method. The field strength coupled increases with the decrease of the slot amount when the total area of aperture is unchanged. The shielding effectiveness is the smallest when the electromagnetic pulse reaches the resonant frequency, which is only affected by the actual structure size of the shielding cavity. Comparing to two direction offset, the single achieved much larger field strength, which is symmetrical about offset center. The coupled field strength is the smallest when the shape of aperture arrays contains round and rectangular.

scholarly journals Electromagnetic Shielding Performance of Carbon Black Mixed Concrete with Zn–Al Metal Thermal Spray Coating

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 895 ◽  
Author(s):  
Han-Seung Lee ◽  
Jin-ho Park ◽  
Jitendra Kumar Singh ◽  
Hyun-Jun Choi ◽  
Soumen Mandal ◽  
...  
Keyword(s):  
Carbon Black ◽  
Thermal Spray ◽  
Spray Coating ◽  
Concrete Specimen ◽  
Thermal Spray Coating ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Al Coating ◽  
Metal Spraying ◽  
Spraying Method

The electromagnetic pulse (EMP) is a destructive phenomenon which harms the building, telecommunication, and IT based infrastructure. Thus, it is required to reduce the effect of EMP using shielding materials. In the present study, we have used different thickness of concrete walls by incorporating 1 and 5 wt% of carbon black, as well as 100 µm thick Zn–Al coating using the arc thermal metal spraying method (ATMSM). The EMP was evaluated using waveguide measurement fixture for shielding performance of the concrete wall in the range of 0.85 to 1 GHz frequency. The results reveal that the maximum value, i.e., 41.60 dB is shown by the 5-300-N specimen before application of Zn–Al coating where the thickness of concrete wall was 300 mm and 5% carbon black. However, once the 100 µm thick Zn–Al coating was applied on concrete specimen, this value was increased up to 89.75 dB. The increase in shielding values around 48 dB after using the Zn–Al coating is attributed to the reflection loss of the metal thermal spray coating. Thus, the Zn–Al coating can be used for EMP application instead of metallic plate.

Anti-Corrosion Performance of Zn-Al Thermal Metal Spraying Method Using Steel Structures

2007 ◽  
Vol 348-349 ◽  
pp. 453-456
Author(s):  
Sang Hyun Lee ◽  
Han Seung Lee ◽  
Je Woon Kyung ◽  
Chang Soo Kang ◽  
Man Hae Han
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Current Density ◽  
Steel Structures ◽  
Corrosion Current ◽  
Corrosion Performance ◽  
Base Materials ◽  
Resistance Reaction ◽  
Resistance Performance ◽  
Metal Spraying ◽  
Spraying Method

This study performs an electrochemical experiment to quantitatively evaluate the corrosion resistance performance in a Zn-Al thermal metal spraying method and produces corrosion current density according to the type of corrosion resistance methods. In the results of the calculation, the corrosion membrane produced in a Zn-Al thermal metal spraying method showed voltage differences more than 300 mV and that demonstrated enough corrosion performance with the corrosion resistance reaction of base materials and proper Zn-Al ratio, such as 50:50. Also, the results exhibited that the corrosion speed in a Zn-Al thermal metal spraying method was 0.66 time faster than that of the zinc galvanizing method in the estimation based on the standard of corrosion resistance service years in a zinc galvanizing method (JIS H 8641).

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