Inventors:
James C. Administrator of the National Aeronautics and Space Fletcher
James W. Bilbro - Huntsville AL
Werner K. Dahm - Huntsville AL
Ronald B. Campbell - Sudbury MA
Robert M. Huffaker - Huntsville AL
Harold B. Jeffreys - Decatur AL
Albert V. Jelalian - Bedford MA
Wayne H. Keene - Medfield MA
Michael C. Krause - Huntsville AL
Thomas R. Lawrence - Huntsville AL
Charles M. Sonnenschein - Natick MA
David J. Wilson - Huntsville AL
James A. L. Thomson - Berkeley CA
International Classification:
G01B 902
G01N 2100
Abstract:
A system for remotely measuring velocities present in discrete volumes of air in which a CO. sub. 2 laser beam is focused by a telescope at such a volume, a focal volume, and within the focusable range, near field, of the telescope. The back scatter, or reflected light, principally from the focal volume, passes back through the telescope and is frequency compared with the original frequency of the laser, and the difference frequency or frequencies represent particle velocities in that focal volume.