Characteristics of acoustic signals from lightning using a microphone array observation system

Conference on Innovation in Technology and Engineering Science

工业技术（总论）

Hazmi, A.^1 ; Emeraldi, P.^1 ; Hamid, M.I.^1

Electrical Engineering Department, Universitas Andalas, Padang, Indonesia^1

关键词: Acoustic signals;    Four microphones;    Frequency variation;    Lightning channel;    Microphone arrays;    Observation systems;    Power spectra density;    Short time Fourier transforms;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/602/1/012026/pdf
DOI  :  10.1088/1757-899X/602/1/012026

学科分类：工业工程学

来源: IOP

【 摘 要 】

The acoustic signals of thunder provide information on the lightning channel, such as frequency, power spectra density, and images. In this study, to analyze the frequency variation in acoustic signals of thunder and to reconstruct the 3D lightning channel imaging, the short time Fourier transform (STFT) and differential time of arrival (DTOA) methods were used. The results showed that the frequency for four microphones varied from 4.88 Hz to 175.78 Hz. Furthermore, the range of power spectra density values for the four microphones was between -0.59 dB/Hz and -28.31 dB/Hz. This system can reconstruct 3D lightning channel imaging.