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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 9, Iss. 8 — Aug. 1, 1970
  • pp: 1789–1797

The Remote Detection of Clear Air Turbulence by Infrared Radiation

R. W. Astheimer  »View Author Affiliations


Applied Optics, Vol. 9, Issue 8, pp. 1789-1797 (1970)
http://dx.doi.org/10.1364/AO.9.001789


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Abstract

Clear air turbulence (CAT) is frequently associated with horizontal temperature gradients of the atmosphere. An instrument has been developed for detecting such gradients remotely by sensing the infrared radiation emitted by the carbon dioxide in the atmosphere. Three of these instruments have been installed on commercial jet aircraft, to evalute this technique for providing advance warning of CAT. Many light turbulence encounters have been detected as much as 80 miles (130 km) (8 min) in advance. A high false alarm rate was experienced because of temperature gradients not associated with turbulence. No severe turbulence has been encountered to date. It is hoped that the temperature effects associated with severe turbulence will be large enough to permit establishing higher alarm threshold levels which will substantially reduce the false alarm rate. Future plans include evaluation of a vertical scan mode for detection of temperature inversions.

© 1970 Optical Society of America

History
Original Manuscript: January 15, 1970
Published: August 1, 1970

Citation
R. W. Astheimer, "The Remote Detection of Clear Air Turbulence by Infrared Radiation," Appl. Opt. 9, 1789-1797 (1970)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-9-8-1789


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References

  1. P. W. Kadlec, “Exploration of the Relationship between Atmospheric Temperature Change and CAT,” Joint ION–SAE Conference on CAT, Feb. 1966, Washington, D.C.
  2. L. D. Kaplan, J. Opt. Soc. Amer. 49, 1004 (1959). [CrossRef]
  3. D. Q. Wark, H. E. Fleming, Monthly Weather Rev. 94, 351 (1966). [CrossRef]
  4. G. K. Mather, M. Weiss, in Proc. 5th Symp. Remote Sensing Environ., April 1968, University of Michigan.
  5. F. A. Mitchell, D. T. Prophet, in Clear Air Turbulence and Its Detection, Y. H. Pao, A. Goldburg, Eds. (Plenum Press, New York, 1969), pp. 144–82.
  6. W. L. Wolfe, Ed. Handbook of Military Infrared Technology (Office of Naval Research, Washington, D.C., 1965), Chap. 18.
  7. V. R. Stull, P. J. Wyatt, G. N. Plass, Infrared Transmission Studies, Vol. 3, , Space Systems Division, Air Force Systems Command.
  8. R. Jimenez, M. Weiss, “Some Results of Inflight Testing an Infrared Sensor as a CAT Detector,” 6th Symp. Remote Sensing Environ., Oct. 1969, University of Michigan.
  9. E. F. Flint, see Ref. 5, pp. 449–75

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