Date of Award
Master of Science
Department of Engineering Physics
Steven T. Fiorino, PhD.
The High Energy Laser End-to-End Operational Simulation (HELEEOS) off-axis scattering algorithm is designed to predict the irradiance that will be detected at a given off-axis location due to atmospheric scattering of a high-energy laser. The HELEEOS system models the propagation of the laser through the atmosphere, accounting for such effects as turbulence, thermal blooming, and atmospheric absorption. The HELEEOS off-axis scattering algorithm uses the scattering phase functions of the Mie scattering models to predict the amount of radiation that will be scattered toward a particular observation location from each point along the beam path, and the total irradiance that will be received at that location. Algorithm outputs were compared with data from a laser test conducted at Wright-Patterson Air Force Base using 1.53-1.59 μm communications lasers operating at 0.6 W of power. The off-axis irradiance was measured using an Indium Gallium Arsenide (InGaAs) camera. A software application was developed to assist in camera calibration and the analysis of the collected images. The application was used to reduce the data from each image to a single irradiance value which could be compared with HELEEOS predictions. Preliminary results show an agreement within 1-2 orders of magnitude between the HELEEOS algorithm and the measured off-axis irradiance, although the potential exists for improving this result through more detailed analysis of the same data set.
DTIC Accession Number
Haiducek, John D., "Experimental Validation Techniques for the HELEEOS Off-Axis Laser Propagation Model" (2010). Theses and Dissertations. 2168.