arXiv subjects

Nobuaki Shimoji

Publications and source records attributed to Nobuaki Shimoji.

2 recordsLinked to original sources

arXiv2015

Spatial Variation of the Correlated Color Temperature of Lightning Channel

In present work, we propose the analysis method of lightning based on the color analysis. We analyzed the digital still images in which the cloud-to-ground (CG) and intracloud (IC) lightning flashes are shown. Applying some digital image processing techniques, we extracted lightning channels. Then, the correlated color temperature (CCT) of the extracted lightning channels was obtained by mapping digital pixels of the extracted lightning channels to CIE 1931 xy-chromaticity diagram. Our results indicate that the CCT of lightning channels changes spatially. Furthermore, it suggests that the energy of lightning channels changes spatially.

physics.ao-ph↗

arXiv2014

Development of Lightning Simulator

In this work we have developed a lightning simulator. Reproducing the light of lightning, we adopted seven waveforms that contains two light waveforms and five current waveforms of lightning. Furthermore, the lightning simulator can calibrate the color of the simulated light output based on a correlated color temperature (CCT). The CCT of the simulated light can range over from $4269$ K to $15042$ K. It is considered that the lightning simulator is useful for the test light source of the optical/image sensor of the lightning observation. Also for science education (e.g. physics education and/or earth science education etc.), the lightning simulator is available. In particular, the temporal change can be slowly seen by expanding the time scale from microsecond to second.

physics.ins-det↗