Emission and Transmission of Atmospheric Radiation and Their Influence on the Performance of Electro-Optics Systems - Measurement, Analysis and Modelling.

摘要

Measurements were made at visible, infrared (IR) and near millimeter wave (NMMW) wavelengths to determine the effect of various atmospheric conditions including those containing artificially generated dust, on transmission. Results from these tests indicate little or no attenuation at NMMW frequencies (96 GHz, 140 GHz, 220 GHz), while there were appreciable transmittance losses at visible (0.4 - 1.1 um) and IR (3.0 - 5.5 um, 8.0 - 13.0 um) wavelengths. Analysis of the visible and IR transmittance data obtained through vehicle-generated dust clouds indicated a spectral dependency after the fallout of the heavier particles. Extinction coefficients were calculated for each of the bandwidths. The ratio between the IR, NMMW, and visible wavelengths were 0.86 for 3.0 - 5.5 um, 0.78 for 8.0 - 13.0 um, and less than 0.003 for 96 GHz, 140 GHz and 220 GHz. (Author)