Infrared image scintillation: comparison of modeling and measurement

Ingmar G. E. Renhorn; Thomas Svensson; Göran Carlsson; Staffan Cronström; Glenn David Boreman

doi:10.1117/1.2158976

1 January 2006 Infrared image scintillation: comparison of modeling and measurement

Ingmar G. E. Renhorn, Thomas Svensson, Göran Carlsson, Staffan Cronström, Glenn David Boreman

Author Affiliations +

Optical Engineering, Vol. 45, Issue 1, 016001 (January 2006). https://doi.org/10.1117/1.2158976

Abstract

Atmospheric scintillation effects on point targets and small targets are studied in the middle-wave infrared (MWIR) band over a 2.5-km horizontal path. Expressions are presented for both exact numerical calculations and for a Gaussian-aperture approximation of scintillation that has an accurate analytic solution. Experimental results show that measurements of C_n² using a commercial NIR scintillometer allow the prediction of average scintillation levels in the MWIR when corrections are made for wavelength and dimensions of the source and receiver. The measured log-irradiance values are approximately lognormal, and are about a factor of 2 higher than would have been expected from theory. Our results are relevant for analysis of detection and false-alarm probabilities over long horizontal paths in the MWIR.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Ingmar G. E. Renhorn, Thomas Svensson, Göran Carlsson, Staffan Cronström, and Glenn David Boreman "Infrared image scintillation: comparison of modeling and measurement," Optical Engineering 45(1), 016001 (1 January 2006). https://doi.org/10.1117/1.2158976

Published: 1 January 2006

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