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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 60, Iss. 7 — Jul. 1, 1970
  • pp: 925–935

Light Propagation through a Turbulent Atmosphere: Measurements of the Optical-Filter Function


JOSA, Vol. 60, Issue 7, pp. 925-935 (1970)

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Two He—Ne lasers operating at 6328 Å have been utilized to make simultaneous measurements of the effects of scintillation over homogeneous optical paths of 650 and 1300 m to study the transfer of laser radiation through a turbulent medium. At the path terminus, multiple sampling of each laser beam was effected by use of a photo-optical technique that records a 61-cm cross section of an optical beam. Concurrent with the optical data, wind-speed and direction recordings were made at multiple points along the optical path in order to estimate the homogeneity of meteorological conditions. Near the path terminus, measurements of wind shear and temperature lapse were taken. In addition, high-speed-thermometry techniques were utilized to compute one-dimensional temperature spectra as well as the thermal structure coefficient CT. Data were gathered during temperature-lapse, neutral, and inversion conditions. Log-irradiance scans derived from the optical data were used to compute log-irradiance power spectra, variance, and other statistical quantities. From these optical and meteorological data, optical-filter functions were calculated for spatial frequencies above 87 cycles/m and are usedfor comparison with current theories. The saturation of the log-irradiance data is again observed, and the isotropy of the irradiance fluctuations is examined.

PETER M. LIVINGSTON, PAUL H. DEITZ, and ERNEST C. ALCARAZ, "Light Propagation through a Turbulent Atmosphere: Measurements of the Optical-Filter Function," J. Opt. Soc. Am. 60, 925-935 (1970)

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  20. Photometrics, Inc., independently scanned the films and determined the power spectra of the identical exposures. Their results are in direct agreement with those reported here.
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