Scintillation characterization under diverse conditions

Patrick T. Ryan; Dustin C. Johnston; Robert Q. Fugate

doi:10.1117/12.283889

23 September 1997 Scintillation characterization under diverse conditions

Patrick T. Ryan, Dustin C. Johnston, Robert Q. Fugate

Proceedings Volume 3125, Propagation and Imaging through the Atmosphere; (1997) https://doi.org/10.1117/12.283889
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The Starfire Optical Range (SOR) has measured scintillatjon at 1 .5microns over a wide range of elevation angles. Comparison of measured results with theoretical expectations revealed widespread agreement. Increasing zenith angle produced increased spatial correlation distances and loss of high spatial frequency content. The magnitude of the increase in correlation distance agreed with accepted theory which predicts dependence on the distance to the turbulence, which is at the tropopause in this case. The bandwidth ofthe collected signal had no discernible effect on correlation distance nor on the amount of scintillation. For the experimental bandwidths used, none were expected. Aperture averaging followed Yura and McKinley's prediction of a diameter to the 716th dependence. Using spatially separated apertures was also shown to be effective at decreasing the amount of scintillation beyond total area effects. Increasing the aperture dimensions had an even larger effect on the number of fades below a given threshold. For optical communication applications, this should be considered closely.

Citation Download Citation

Patrick T. Ryan, Dustin C. Johnston, and Robert Q. Fugate "Scintillation characterization under diverse conditions", Proc. SPIE 3125, Propagation and Imaging through the Atmosphere, (23 September 1997); https://doi.org/10.1117/12.283889

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