Mr. Mitihiro Nakai Profile

Mitihiro Nakai

at OPT Gate Co Ltd

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Proceedings Article | 21 December 2024 Poster + Paper

Visualization and quantitative evaluation of fog and smoke activity by using LD mini-Lidar

Yusuke Shida, Masayuki Tanaka, Michihiro Nakai, Masakazu Hanashima, Tatsuo Shiina

Proceedings Volume 13265, 132650K (2024) https://doi.org/10.1117/12.3043051

KEYWORDS: Fiber optic gyroscopes, LIDAR, Transmittance, Vacuum chambers, Particles, Visualization, Light sources, Receivers, Safety, Mie scattering

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Traffic and health hazards caused by fog and smoke have become a societal problem. Capturing such phenomena in the early stages of their occurrence is expected to be useful for hazard countermeasures and safety planning. The objective of this research is to design and develop a mini-Lidar for atmospheric measurement using a 405 nm LD as a light source with a distance resolution and time acquisition of 0.15 m and 2s, respectively. Specifically, it aims to visualize the initial behavior of fog and smoke in the observation area, and to compare and evaluate the temporal changes of Lidar echoes and transmittance measurements. In the experiment, fog and smoke were generated in a 1m³ chamber positioned 15m away from the Lidar system. A transmittance meter is located at the chamber to visualize and quantitatively evaluate the initial behavior of the fog. It was found that there was a negative linear correlation between transmittance and Lidar counts in the range of transmittance above 90%, which is close to the initial fog density. Furthermore, in the correlation graph between Lidar counts and transmittance, the difference in slopes between fog and smoke indicates that there is a difference in the attenuation of light in each material. We also discussed it under the consideration of each of their extinction coefficients.

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