Accession Number : ADA258855


Title :   Remote Sensing of Turbulence and Transverse Atmospheric Wind Profiles using Optical Reference Sources


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Koeffler, Steven C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258855.pdf


Report Date : Dec 1992


Pagination or Media Count : 116


Abstract : This thesis examines a remote sensing technique for measuring the atmospheric structure constant and the transverse atmospheric wind velocity as a function of altitude by performing temporal and spatial correlations of band pass filtered wave front slope sensor measurements. Two point sources are used to illuminate two pairs-of cc-located wave front slope sensors. The sources and sensors are arranged to give rise to crossed optical paths. For each pair of wave front slope sensors, the output of the larger sensor is subtracted from the output of the smaller sensor. This band pass filters the smaller sensor's output. The filtered outputs are then correlated. The spatial correlation is related to the structure constant by an integral containing a path weighting function. The path weighting function is sharply peaked at the intersection altitude and decays rapidly to zero. The temporal correlation is related to the wind velocity through an integral containing a wind path weighting function which is sharply peaked at the intersection altitude and decays rapidly to zero. The vertical resolution of each path weighting function is calculated. Also, signal-to-noise ratios are calculated using generally accepted models for the structure constant and atmospheric wind profiles.


Descriptors :   *OPTICAL DETECTION , *TURBULENT FLOW , *REMOTE DETECTION , *ATMOSPHERIC MOTION , VELOCITY , RESOLUTION , WEIGHTING FUNCTIONS , WIND SHEAR , NOISE , PHASE DETECTORS , ATMOSPHERICS , TRANSVERSE , ADAPTIVE OPTICS , ATMOSPHERIC REFRACTION , REFRACTION , WIND VELOCITY , PROFILES , SIGNAL TO NOISE RATIO , THESES , STRUCTURES , OPTICS


Subject Categories : Meteorology
      Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE