Influence of atmospheric turbulence on imaging quality of electro-optical sensors in different climates

Karin R. Weiss-Wrana

doi:10.1117/12.511801

6 February 2004 Influence of atmospheric turbulence on imaging quality of electro-optical sensors in different climates

Karin R. Weiss-Wrana

Proceedings Volume 5237, Optics in Atmospheric Propagation and Adaptive Systems VI; (2004) https://doi.org/10.1117/12.511801
Event: Remote Sensing, 2003, Barcelona, Spain

Abstract

During long-term experiments FGAN-FOM measured C_n² values over land with identical scintillometers in two different climates, in moderate climate in mid-Europe and in arid climate. Since C_n² usually changes as a function of time-of-day and of season its influence on electro-optical systems can only be expressed in a statistical way. The cumulative frequencies of occurrence were calculated for a time period of one month for different times of the day. The statistical analysis was applied to calculate the effects of atmospheric turbulence on sensor performance like turbulence MTF, the resolution limit due to turbulence and intensity fluctuation. The calculations were performed for a SWIR sensor (active imaging system) and for typical MWIR and LWIR warning sensors. Turbulence MTF were calculated for a slant path of 5 km from the ground to a height of 100 m for upward and downward looking cases. For horizontal paths at a height of 2 m and 30 m the resolution limits due to turbulence were compared with the corresponding diffraction-limited ones. Calculations of the normalized intensity fluctuations were carried out for two slant propagation paths (zenith angle β = 30° and 80°).

Citation Download Citation

Karin R. Weiss-Wrana "Influence of atmospheric turbulence on imaging quality of electro-optical sensors in different climates", Proc. SPIE 5237, Optics in Atmospheric Propagation and Adaptive Systems VI, (6 February 2004); https://doi.org/10.1117/12.511801

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