Understanding lidar returns from complex dust mixtures

Autor:	D. A. Hook, Brandon J. N. Long, Garrett E. Pangle, Hans Hallen, C. R. Philbrick
Rok vydání:	2013
Předmět:	Materials science business.industry Attenuation length Physics::Optics complex mixtures Refraction respiratory tract diseases Lidar Optics Ellipsometry Extinction (optical mineralogy) Absorption (electromagnetic radiation) business Refractive index Quartz
Zdroj:	SPIE Proceedings.
ISSN:	0277-786X
DOI:	10.1117/12.2017698
Popis:	Lidar is a powerful tool for measuring the vertical profiles of aerosols. Dusts are irregularly-shaped particles with varied composition and strong index of refraction variations in the LWIR. We measure dust indices using ellipsometry and transmission through KBr pellets. Milling makes the ellipsometry data less dependent on incidence angle, and the results of measurements on milled materials agree with those from transmission measurements. Measurements show that the spectrum of a milled Arizona Road Dust (ARD) approaches that of pure quartz, indicating a decrease of absorption efficiency for particles larger than the absorption length. These indices of refraction will be used in the future to simulate extinction for the beam of a LWIR lidar.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5ee4c69e0fef6d888f5c0473d9252f6f https://doi.org/10.1117/12.2017698 Zobrazit plný text záznamu