Abstract
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.
Highlights
The Raman scattering light has an information of the target gas, which is characteristic Raman shift with the target itself, and we can distinguish the target from the other gases [1]-[2]
We have focused on the hydrogen gas detection with a compact Raman lidar with a DPSS laser [5]-[7]
We developed a LED mini Raman lidar, which was replaced the light source of the DPSS laser to a LED pulse module
Summary
The Raman scattering light has an information of the target gas, which is characteristic Raman shift with the target itself, and we can distinguish the target from the other gases [1]-[2]. The leakage detection of hydrogen gas is important for the hydrogen gas station and fuel cell manufacture scene To detect it on site, the lidar should be compact and bring it everywhere. The laser beam is not accepted in certain facilities, for example, in a nuclear power facility Under such backgrounds, we developed a LED mini Raman lidar, which was replaced the light source of the DPSS laser to a LED pulse module. We calculated the adequate optical power to detect the low percentage hydrogen gas and fixed the concrete lidar design. It could have successfully accomplished the quantitative measurement of the hydrogen gas concentration within 1 – 100% [8]-[9]. We state the concrete specification of the LED mini Raman lidar and some results of the atmospheric activity observations
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