Theoretical Studies of Time Dependent/Independent Radiative Transfer Including Inelastic Scattering for both Active and Passive Sources
TEXAS A AND M UNIV COLLEGE STATION DEPT OF PHYSICS
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LONG-TERM GOALS. We wish to develop the theoretical and computational groundwork for a new and innovative program for the remote detection and characterization of both organic and inorganic aerosols using both active lidar and passive techniques. This aerosol study should be very beneficial to the Navy in the areas of communications, high power laser transmission, air-sea interactions, and standoff biological detection methods. We also want to continue our collaborative program in polarimetry with the group in Minsk headed by Dr. Eleonora Zege. OBJECTIVES. We will incorporate the full Mueller matrix formulation in this study to extract everything optically that can be extracted from the scattering and fluorescing aerosols. This study will also include the use of state-of-the-art techniques to calculate the single scattered Mueller matrix SSMM for both single particles as well as ensembles of particles that have different morphology and optical properties. We will show how to extend the SSMM into an effective multiple scattering Mueller matrix MSMM when multiple scattering has to be taken into account. We will also show that by using the MSMM it may be possible to not only determine particle optical properties and number densities but particle morphology as well. We will then determine which Mueller matrix elements or combination of them are most effective for unique aerosol signatures. We are also continuing to explore new and exciting methods for standoff detection of harmful biological aerosols such as anthrax spores. APPROACH. The success of this study for an active system depends on having programs to accurately calculate the complete time-resolved Mueller matrix for a realistic source-receiver geometry for a medium consisting of atmospheric gasses, clouds, and aerosols.
- Nuclear Physics and Elementary Particle Physics