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A Study on Influences of Metal Materials on Electromagnetic Field Generated by Pure DC and Combined DC
(2018-10-15)
Sriratana, Witsarut
;
Kaewnamchai, Vanisara
;
Sriratana, Erdlekha
This paper presents the classification of metals materials by application of Hall Effect sensor based on the eddy current method with non-destructive testing. The electromagnetic field was generated by winding an SWG 22 wire onto the ferrite core to create a solenoid. Two measurement systems are used. One uses a Pure DC supply as the excitation voltage of the electromagnetic field of the Hall Effect sensor system; while the other uses a combination of AC and DC supply, which is amplified through an integrated Class-A amplifier circuit, as the excitation voltage. Three different metal samples, namely, steel, aluminum and stainless steel were used as specimen. Current test conducted to determine the suitable current level revealed that a 0.8 A current is safe to allow tests to be conducted. Results show that the Combined DC system is capable to classify conductive materials, where the Pure DC system lacks in this functionality. The Output voltage of Hall Effect sensor to test with steel, aluminum and stainless steel is 4.68 V, 1.74 V and 3.63 V, respectively. Furthermore, the use of the Combined DC system enables aluminum thickness to be distinguished. The tolerance of the system measuring the materials when using the Pure DC and Combined DC are pm 0.0697% and pm 0.58530% respectively.
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A software tool for induced voltages and currents calculation caused by lightning electromagnetic field in PV systems
(2015-08-17)
Fuangfung, Yuttana
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Sinthusonthishat, Saliltip
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Yutthagowith, Peerawut
This article aims to introduce a software tool for induced voltages and currents calculation inside structure caused by electromagnetic field radiated by lightning strike to PV systems which are installed on the top of the structure. The methodology used in the calculation is accordance with standard IEC 62305 - 4: 2010. This program has been developed to determine electromagnetic field, induced loop voltages and currents in a lightning protection zone 1 (LPZ 1). As a result, the software is very useful in calculation of induced over-voltage and current and helps engineers in lightning protection design.
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Nonlinear optical properties of controlled fabrication of copper nanowires by a shadow deposition
(2013-01-28)
Locharoenrat, Kitsakorn
The strongly geometrical shape, high aspect ratios, and nanoscale cross-section of nanowires is expected to affect optical properties through confinement effects. Herein we have investigated optical properties of Cu nanowires with studies of second harmonic generation (SHG) spectra. These optical properties of Cu nanowires will be one of the most important issues when considering the types of materials used in current applications and development of new applications. © (2013) Trans Tech Publications, Switzerland.
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Characterization, optical, and theoretical investigation of arrays of the metallic nanowires fabricated by a shadow deposition method
(2013-01-28)
Locharoenrat, Kitsakorn
;
Mizutani, Goro
We have fabricated Au, Cu, and Pt nanowires by using a shadow deposition technique. We have then investigated optical properties of these nanowires by studying the second harmonic generation (SHG) spectra. With experimental and theoretical studies, we have discovered that the surface plasmon resonance was served as an origin of the enhancement of the SH response from the metallic nanowires. © (2013) Trans Tech Publications, Switzerland.
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Analysis of heat transfer and specific absorption rate of electromagnetic field in human body at 915 MHz and 2.45 GHz with 3D finite element method
(2012-12-01)
Suwansin, W.
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Phasukkit, P.
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Pintavirooj, C.
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Sanpanich, A.
This paper presents 3D finite element analysis for heat transfer and specific absorption rate of electromagnetic field in human body at 915 MHz and 2.45 GHz. The purpose of this research is to study the effects and harmfulness of leakage electromagnetic field to organ in living tissue. We propose a simulation of microwave radiation by using a finite element method (FEM) to our system for studying heat transfer and specific absorption rate of electromagnetic field in multi-organs living tissue. Electromagnetic wave distribution source in our system was designed as a microstrip type and placed at 5 cm from multi-organs living tissue model. As a preliminary, leakage power was assumed at 100 W and exposure time was 1800 s. The result from finite element method show distribution of electromagnetic field in 3D air space of multi-organs tissue model , specific absorption rate (SAR) and temperature. The SAR value will be followed the standard of ICNIRP (1998) and the results at 915 MHz and 2.45 GHz shown that maximum temperature in organs are different if frequencies different, in 3D model can be obtained every point of view and benefit for development protection system in near future. ©2012 IEEE.

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