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Sökning: WFRF:(Abewardhana Ruwan)

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1.
  • Abegunawardana, Sidath, et al. (författare)
  • Sound Source Localization of Lightning Discharges
  • 2018
  • Konferensbidrag (refereegranskat)abstract
    • The lightning channel can be retraced by thunder signature recorded with an array of microphones. Four microphones were arranged to capture thunder sound, and acoustic cross-correlation of captured pressure signals estimated the time lag of each pair of microphones. A wave segment with 0.25 s or 0.5 s of duration was compared with the acoustic signal recorded by other microphones to estimate time lapse. The direction of channel propagation has been estimated by the time difference of arrival of each pair of microphones. Thunder source locations estimated by this method can be extended to investigate the channel propagation inside clouds.
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2.
  • Abewardhana, Ruwan, et al. (författare)
  • Lightning Localization Based on VHF Broadband Interferometer Developed in Sri Lanka
  • 2018
  • Ingår i: 2018 34th international conference on lightning protection (ICLP 2018). - New York : IEEE. - 9781538666357
  • Konferensbidrag (refereegranskat)abstract
    • A basic broadband digital interferometer was developed, which is capable of locating Very High Frequency (VHF) radiation sources in two spatial dimensions and time. Three antennas sensed the time series of broadband electromagnetic (EM) signals and digitized with 4 ns sampling interval for a duration of several milliseconds. A technique based on cross-correlations has been implemented for mapping lightning source locations. A map of the first return stroke (RS) and the preceding stepped leader was mapped successfully, using the system with a time resolution of few milliseconds. The result was compared with the visible events of the ground flash to validate the system.
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konferensbidrag (2)
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refereegranskat (2)
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Abegunawardana, Sida ... (2)
Fernando, Mahendra (2)
Cooray, Vernon, 1952 ... (2)
Abewardhana, Ruwan (2)
Bodhika, J A P (1)
Sonnadara, Upul (1)
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Uppsala universitet (2)
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Engelska (2)
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2018 (2)

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