Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia

Lightning that generates electric fields is known to have negative consequences. Therefore, the electric field radiated in microwave and characteristics of different types of lightning activities are studied and analysed to better understand lightning based problems. In this study, two types of ligh...

Full description

Saved in:

Bibliographic Details
Main Author:	Zakaria, Zaini
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/78643/1/ZainiZakariaMFKE2016.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.78643
record_format	uketd_dc
spelling	my-utm-ep.786432018-08-29T07:53:15Z Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia 2016-08 Zakaria, Zaini TK Electrical engineering. Electronics Nuclear engineering Lightning that generates electric fields is known to have negative consequences. Therefore, the electric field radiated in microwave and characteristics of different types of lightning activities are studied and analysed to better understand lightning based problems. In this study, two types of lightning electric fields which are Negative Return Strokes (NRS) and Narrow Bipolar Pulses (NBP) are thoroughly analysed. A total of 89 NRS data and 115 NBP data were selected from a set of data recorded during the northeast monsoon period from November to December 2012 in the vicinity of Universiti Teknologi Malaysia (UTM), Johor. For that purpose, flat plate antenna with electronic buffer circuit and a 2.4 GHz monopole antenna were used to measure vertical electric field and microwave radiation. Apart from the electric field characteristics analysis, the measurements of microwave radiation at 2.4 GHz associated with NRS and NBP were also performed and the results are depicted in this study. Nonetheless, the wavelet and the frequency spectrum of both NRS and NBP were examined and the results are discussed inclusively. Furthermore, the number of microwave radiations associated with NBP were notably higher than that of NRS, which indicated that the mechanism of NBP was more distinguished compared to that of NRS. On top of that, the duration of 2.4 GHz emission associated with NBP was discovered to be a factor of a few tens shorter than that of High Frequency (HF) radiation from return strokes. Meanwhile, analysis on the wavelet and frequency spectrum reveals that the energy spectrum for NBP concentrates at high frequency (200 kHz to 500 kHz) with average power spectrum peak of the initial part for NNBP and NPBP to be 76,650 (V/m)2 and 76,309 (V/m)2, respectively. However, the initial part power spectrum peak corresponding to NRS is about 118,931(V/m)2 with lower frequency spectrum (60 kHz). The results suggest that NBP radiates energy at high frequency region compared to NRS. Hence, it can be concluded that electric field pulse for NBP experiences more extensive and rapid ionization process compared to NRS. 2016-08 Thesis http://eprints.utm.my/id/eprint/78643/ http://eprints.utm.my/id/eprint/78643/1/ZainiZakariaMFKE2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:94176 masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Zakaria, Zaini Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia
description	Lightning that generates electric fields is known to have negative consequences. Therefore, the electric field radiated in microwave and characteristics of different types of lightning activities are studied and analysed to better understand lightning based problems. In this study, two types of lightning electric fields which are Negative Return Strokes (NRS) and Narrow Bipolar Pulses (NBP) are thoroughly analysed. A total of 89 NRS data and 115 NBP data were selected from a set of data recorded during the northeast monsoon period from November to December 2012 in the vicinity of Universiti Teknologi Malaysia (UTM), Johor. For that purpose, flat plate antenna with electronic buffer circuit and a 2.4 GHz monopole antenna were used to measure vertical electric field and microwave radiation. Apart from the electric field characteristics analysis, the measurements of microwave radiation at 2.4 GHz associated with NRS and NBP were also performed and the results are depicted in this study. Nonetheless, the wavelet and the frequency spectrum of both NRS and NBP were examined and the results are discussed inclusively. Furthermore, the number of microwave radiations associated with NBP were notably higher than that of NRS, which indicated that the mechanism of NBP was more distinguished compared to that of NRS. On top of that, the duration of 2.4 GHz emission associated with NBP was discovered to be a factor of a few tens shorter than that of High Frequency (HF) radiation from return strokes. Meanwhile, analysis on the wavelet and frequency spectrum reveals that the energy spectrum for NBP concentrates at high frequency (200 kHz to 500 kHz) with average power spectrum peak of the initial part for NNBP and NPBP to be 76,650 (V/m)2 and 76,309 (V/m)2, respectively. However, the initial part power spectrum peak corresponding to NRS is about 118,931(V/m)2 with lower frequency spectrum (60 kHz). The results suggest that NBP radiates energy at high frequency region compared to NRS. Hence, it can be concluded that electric field pulse for NBP experiences more extensive and rapid ionization process compared to NRS.
format	Thesis
qualification_level	Master's degree
author	Zakaria, Zaini
author_facet	Zakaria, Zaini
author_sort	Zakaria, Zaini
title	Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia
title_short	Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia
title_full	Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia
title_fullStr	Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia
title_full_unstemmed	Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia
title_sort	characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in malaysia
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/78643/1/ZainiZakariaMFKE2016.pdf
_version_	1747818035895336960

Characteristics of narrow bipolar pulses and negative return strokes of vertical electric fields generated by lightning recorded in Malaysia

Similar Items