ALIGNMENT SURVEYS IN A TURBULENT ATMOSPHERE USING LASER

THERMAL TURBULENCE OF AIR CAUSES RANDOM DEFLECTIONS OF A LASER BEAM AND DESTROYS ITS COHERENCY. THE PRESENT METHODS OF FINDING THE CENTER OF ENERGY OF A LASER SPOT GIVE AN ACCURACY AS HIGH AS 0.2 SEC OF ARC AT SHORT DISTANCES, BUT THEIR ACCURACY DETERIORATES RAPIDLY AFTER DISTANCES LONGER THAN ABOUT 100 M DUE TO THE EFFECT OF TURBULENCE. THE AUTHORS HAVE DEVELOPED, CONSTRUCTED, AND TESTED NEW CENTERING DETECTORS WHICH INTEGRATE THE SCINTILLATING LASER ENERGY OVER A CERTAIN PERIOD OF TIME. THIS ENABLES THE CENTER DETERMINATION WITH THE STANDARD DEVIATION OF 0.2 SEC OF ARC FOR DISTANCES UP TO SEVERAL KILOMETERS. /AUTHOR/

  • Supplemental Notes:
    • pp 494-513, 14 FIG, 2 TAB, 13 REF
  • Authors:
    • Chrzanowski, A
    • Ahmed, F A
  • Publication Date: 1971-3

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Filing Info

  • Accession Number: 00202907
  • Record Type: Publication
  • Report/Paper Numbers: pp 782-785
  • Files: TRIS
  • Created Date: Aug 8 1971 12:00AM