CO2 Raman lidar design for marine drone

Tatsuo Shiina; Ken-ichi Suzuki; Koichi Tezuka

doi:10.1117/12.2680568

17 October 2023 CO₂ Raman lidar design for marine drone

Tatsuo Shiina, Ken-ichi Suzuki, Koichi Tezuka

Proceedings Volume 12728, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023; 1272807 (2023) https://doi.org/10.1117/12.2680568
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Abstract

In this study, CO₂ Raman lidar for marine drone installation is focused. Greenhouse gases such as CO₂, CH₄, N₂O, CFC cause serious global warning. Greenhouse gas mission trading is undergoing, while the new technology of Carbon Dioxide Capture and Storage; CCS is expected. CO₂ gases comes for human activity is stored in the seabed. There, gas leakage becomes problem. It will seriously influence to the surrounding ecosystem. To examine and evaluate the CO₂ concentration in seawater, Drone-based CO₂ Raman lidar is designed. Raman shift of CO₂, 1383/cm, is utilized for this purpose. To install the lidar optics into a marine drone, we designed the fiber-delivered transmitting and receiving optics. The laser system and receiving devices includes all electronics are on a vessel and the transmitting beam and receiving light are delivered to the drone via optical fibers. We conducted the fundamental experiment of Raman scattering signal detection under pure water and seawater with CO₂ gas of 100 – 5000 ppm concentration. The 3rd harmonic Nd:YAG laser of 355nm wavelength is used for incident beam. Its intensity changed from 1mJ to 60mJ. The detector is the spectrometer with electrically cooled ICCD camera. We get the successful linear relationship between Raman signal intensity and CO₂ gas concentration. Under the acknowledge of this fundamental experiment, we designed the drone-based CO₂ Raman lidar. The optics design is followed to the restriction of the casing of the marine drone. The output optical power is estimated with the coupling efficiency 70% of multi-mode UV optical fiber.

Conference Presentation

Citation Download Citation

Tatsuo Shiina, Ken-ichi Suzuki, and Koichi Tezuka "CO₂ Raman lidar design for marine drone", Proc. SPIE 12728, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023, 1272807 (17 October 2023); https://doi.org/10.1117/12.2680568

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