The Investigation Of Thunder For Profiling The Type Of Lightning

Md Jelani, Muhammad Zailan (2016) The Investigation Of Thunder For Profiling The Type Of Lightning. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Cloud-to-ground lightning is one type of lightning which classified as the most dangerous among lightning that destroy properties and harmful to life that may cause injuries and death. Time-to-thunder is one of method to determine the distance of lightning by determine the delay time between lightning radiation and thunder sound as the thunder much slower with speed of 300 m/sec compared to lightning. This concept was adapted by using two measurements techniques: broadband electric radiation field and the acoustic signal recording thunder. The 120db loudness of the thunder sound was detected by omnidirectional electret microphone. The time elapse between sensors was used to calculate the lightning distance. The WaveStudio 7.7.2.3 (Lecroy) and XViewer 1.81 (Yokogawa) software used for analysis work. Based on result, range of distance was between 0.4km and 4km. From this project, it was founded that the data from acoustic channel have some induced voltage which might be from positive streamer at the ground. The data from acoustic sound can be used directly to determine the lightning distance as the first begin time of induced voltage have correlation with standard first return stroke. This useful information can be implemented into a system which can determine the lightning distance automatically for safety purpose.

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