Accession Number : ADA290800

Title :   Path Resolved Optical Sensing of Atmospheric Winds Utilizing Speckle-Turbulence Interaction and Pseudorandum Code Modulation.

Descriptive Note : Final rept. 15 Feb 91-1 Sep 94,

Corporate Author : OREGON GRADUATE INST BEAVERTON

Personal Author(s) : Holmes, J. F.

PDF Url : ADA290800

Report Date : 28 OCT 1994

Pagination or Media Count : 4

Abstract : An innovative new technique for path resolved laser doppler velocimetry is being developed that uses a continuous wave (CW) source. The use of a CW rather than the conventional pulsed laser should result in a light, compact, rugged and more reliable LDV system suitable for use in both spacecraft and aircraft. In addition, the use of multiple CW beams and complimentary pseudo random codes should allow the vector wind to be measured without scanning the beams. Potential applications are global remote sensing of atmospheric winds, wind shear and turbulence detection and primary air instrumentation. In order to obtain range resolved wind and develop the required signal to noise ratio, pseudo random, diphase modulation of the laser and a novel detection scheme has been used. Additional applications for this lidar system are path resolved optical remote sensing of chemical species (DIAL), temperature and pressure.

Descriptors :   *OPTICAL DETECTION, *WIND, *CONTINUOUS WAVE LASERS, OPTICAL RADAR, OPTICAL PROPERTIES, GLOBAL, SPACECRAFT, AIRCRAFT, AIR, CHEMICALS, SIGNAL TO NOISE RATIO, TURBULENCE, PULSED LASERS, LASERS, PHASE, CODING, REMOTE DETECTORS, WIND SHEAR, VECTOR ANALYSIS, INSTRUMENTATION, DOPPLER SYSTEMS, MODULATION, LASER VELOCIMETERS.

Subject Categories : Meteorology
      Lasers and Masers
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE