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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 61, Iss. 10 — Oct. 1, 1971
  • pp: 1279–1284

Phase Variations in Atmospheric Optical Propagation

S. F. CLIFFORD, G. M. B. BOURICIUS, G. R. OCHS, and MARGOT H. ACKLEY  »View Author Affiliations


JOSA, Vol. 61, Issue 10, pp. 1279-1284 (1971)
http://dx.doi.org/10.1364/JOSA.61.001279


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Abstract

Temperature structure in the atmosphere, transported by the wind across a laser beam, produces time variations in the optical path length. Using a He—Ne laser (0.6328 µm) on a 70-m propagation path, we measured the optical phase variations at four different spacings, ρ≤30 cm. Simultaneously, a midpath measurement of wind velocity and temperature structure parameter, <i>C<sub>T</sub></i><sup>2</sup>, provided the necessary meteorological measurements to compare the observed phase structure function with Tatarski’s theoretical curve. We obtained excellent agreement between theory and experiment. Direct measurements of the outer scale of turbulence, taken continuously over a 24-h period at a height of 1.6 m, indicated an average outer scale of 1.3 m with diurnal variations of ±20%. The frequency spectrum of the received phase difference at each of the four spacings is plotted and its implications for the data-sampling rate are examined. The curves obtained exhibit excellent agreement with the predicted spherical-wave phase-difference frequency spectrum.

© 1971 Optical Society of America

Citation
S. F. CLIFFORD, G. M. B. BOURICIUS, G. R. OCHS, and MARGOT H. ACKLEY, "Phase Variations in Atmospheric Optical Propagation," J. Opt. Soc. Am. 61, 1279-1284 (1971)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-61-10-1279


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References

  1. V. I. Tatarski, Wave Propagation in a Turbulent Medium (McGraw-Hill, New York, 1960).
  2. A. Consortini and L. Ronchi, Nuovo Cimento 2, 683 (1969).
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  16. S. F. Clifford, J. Opt. Soc. Am. 61, 1285 (1971).

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