Scintillation And Turbulence Measurements; Comparisons Over A Horizontal Path

Edmund A Murphy; Robert R Beland; James H Brown; Peter J Thomas

doi:10.1117/12.945809

10 August 1988 Scintillation And Turbulence Measurements; Comparisons Over A Horizontal Path

Edmund A Murphy, Robert R Beland, James H Brown, Peter J Thomas

Proceedings Volume 0926, Optical, Infrared, Millimeter Wave Propagation Engineering; (1988) https://doi.org/10.1117/12.945809
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

Turbulence parameters are determined from measurements along a 183 m line-of-sight at Palm Bay, Florida and a 300 m path at Sudbury, Massachusetts. A horizontal scintillometer is used to obtain o 2, the variance of log amplitude of the irradiance, and the path-averaged C 2, the atmospheric refractive index structure constant. Thermosondes are also used to obElain Cn₂ at several locations along the optical path. The mean C₂ is determined from three thermosondes and compared to that from the scintillometer. Statistics obtained from processing the 2 sec sampled data over 10 minute periods are presented. Excellent agreement is obtained between the two systems when averaged over 10 minutes. Statistics obtained over shorter periods show a considerable variation in the Cn₂ estimates within the 10 minute period. The range of variation within 10 minute intervals can exceed 50%. Volume averaging, wind speed and direction fluctuations are discussed as possible causes of short time variations in the Cn₂ estimates.

Citation Download Citation

Edmund A Murphy, Robert R Beland, James H Brown, and Peter J Thomas "Scintillation And Turbulence Measurements; Comparisons Over A Horizontal Path", Proc. SPIE 0926, Optical, Infrared, Millimeter Wave Propagation Engineering, (10 August 1988); https://doi.org/10.1117/12.945809

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