13 August 1997 Correlation between intensity fluctuations in the mid- and long-IR bands for near-sea transmission paths
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Abstract
This paper describes the results of an experiment to measure the correlation between the atmospheric turbulence induced intensity fluctuations in the mid and long IR bands for transmission paths appropriate to the IRS&T. A DF laser operating at 3.8 microns and a carbon-dioxide laser operating at 9.24 microns served as the mid and long IR sources. The experiments were conducted on a 16 km transmission path over the Chesapeake Bay. Data was obtained under a variety of turbulence strengths including the transition between weak and strong turbulence. The experimental correlations values were compared to the predictions of a weak turbulence model. Dispersion between the indices of refraction at 3.8 microns and 9.24 microns appears to be responsible for significant disagreement between the measured and predicted results. Possible applications of the correlation for the IRS&T are briefly discussed.
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Charles S. Bendall, Charles S. Bendall, T. Bull, T. Bull, D. D. Wallin, D. D. Wallin, J. T. Caulfield, J. T. Caulfield, } "Correlation between intensity fluctuations in the mid- and long-IR bands for near-sea transmission paths", Proc. SPIE 3061, Infrared Technology and Applications XXIII, (13 August 1997); doi: 10.1117/12.280364; https://doi.org/10.1117/12.280364
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