Focused laser Doppler velocimeter

Details Focused laser Doppler velocimeter Focused laser Doppler velocimeter

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976msfc.reptw....b&link_type=abstract

Patent National Aeronautics and Space Administration. Marshall Space Flight Center, Huntsville, AL.

Computer Science

Atmospheric Turbulence, Laser Doppler Velocimeters, Remote Sensors, Wind Measurement, Carbon Dioxide Lasers, Frequency Distribution, Light Scattering, Optical Radar, Patents, Telescopes, Wave Reflection

Scientific paper

A system for remotely measuring velocities present in discrete volumes of air is described. A CO2 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.

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