<title>Laser transmission through simulated cirrus clouds</title>

Abstract

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, oatherina and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collectior of information, including suqqestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports ^7045)188)7 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.REPORT DATE (DD-MM-YYYY) LASER TRANSMISSION THROUGH SIMULATED CIRRUS CLOUDS AUTHOR(S)CAPT KOLB ILA L DATES COVERED (From -To)5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)COLORADO STATE UNIVERSITY SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) ABSTRACT OF THESIS LASER TRANSMISSION THROUGH SIMULATED CIRRUS CLOUDSSince approximately 20% of the globe is covered with cirrus clouds at any given time, it is clear that any airborne or spaceborne system using a laser will intercept cirrus clouds at some point. Cirrus clouds contain a very complex microphysical structure that will affect laser power by scattering and reflecting it away from the intended target, thus reducing efficiency and possibly even making it ineffective.Using two thin cirrus laser transmission models, a single homogeneous cloud layer model and a multiple cloud layer model, laser transmission profiles are generated from a simulated cirrus cloud case created by the RAMS model.Sensitivity studies are performed on the laser transmission model to examine the effects of aerosols and water vapor, ice crystal orientation, multiple scattering contributions, and the differences between the single and multiple layer models. ABSTRACT OF THESIS LASER TRANSMISSION THROUGH SIMULATED CIRRUS CLOUDSSince approximately 20% of the globe is covered with cirrus clouds at any given time, it is clear that any airborne or spaceborne system using a laser will intercept cirrus clouds at some point. Cirrus clouds contain a very complex microphysical structure that will affect laser power by scattering and reflecting it away from the intended target, thus reducing efficiency and possibly even making it ineffective.Using two thin cirrus laser transmission models, a single homogeneous cloud layer

Oblique laser transmission and scattering characteristics of multilayer ice-water mixed clouds based on the successive scattering method

“…The zonal mean cloud radiative effect of shortwave peaks at 120 W•m −2 in the tropics and drops to −30 W m −2 , which means that multilayer clouds reflect less Sunlight than single-layer clouds. In another study [21], they found the global mean cloud radiative effects are −41.3 and −50.2 W m −2 . In 2019, M Wang et al [22] established the transmission model between the aircraft communication terminal and the UAV (Unmanned Aerial Vehicle) when the laser passed through the cirrus clouds, and analyzed the relative positions of the aircraft, UAV, and cirrus clouds, and the influence of different cirrus cloud physical properties on the laser transmission signal.…”