Atmosphere Activity Measurement by LED Raman Mini Lidar

• Published in: EPJ Web of conferences Vol. 237; p. 7002
• Main Author: Shiina, Tatsuo
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 2020
• Subjects: Echoes; Lidar; Mie scattering; Raman spectra; Seawater; Target detection
• DOI: 10.1051/epjconf/202023707002
• EISSN: 2100-014X
• ISSN: 2100-014X; 2101-6275

The LED mini lidar was improved to monitor Raman scattering echoes. The Raman scattering signal indicates a certain gas concentration and it can distinguish the target from the other materials. It is so weak, 1/1000 of Mie scattering echoes, but even enough to be stimulated from the target gas with LED pulsed beam. At first, we developed a compact Raman lidar with micro pulse DPSS laser to detect hydrogen gas quantitatively. We replaced it with the LED pulse module, which was calculated enough potential to stimulate Raman scattering and detect the target gas. The next task is the activity measurement of such a target gas. To validate the potential of the LED Raman lidar, we conducted the sea surface atmosphere measurement. As a result, the unique relationship between the surface atmosphere and sea water echoes was observed. In this report, we state the concrete specification of the LED mini Raman lidar and some results of the activity observations.