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Cross beam wind measuring techniques

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dc.contributor.authorHablutzel, Benjamin C., author
dc.contributor.authorCollege of Engineering, Colorado State University, publisher
dc.date.accessioned2007-01-03T05:58:42Z
dc.date.available2007-01-03T05:58:42Z
dc.date.issued1970
dc.descriptionCER70-71BCH13.
dc.descriptionCET69-70BCH26.
dc.descriptionIncludes bibliographical references.
dc.description.abstractThe usefulness of the cross beam technique for measuring atmospheric wind speeds is discussed. Two remote photodetectors monitor the light scattering mainly from dust, water vapor, and atmospheric pollutants, which serve as tracers for the mean wind speed. The time required for the particles to travel from one beam to another (transit time) is computed by space-time correlations of the two signals. The transit time occurs at the maximum correlation between the fluctuations in the two signals. Since the beam separation is known, the wind speed may be computed, once the transit time is known. Six experimental wind measurements using varying beam separations are discussed. To provide a basis for comparison, the wind speeds were monitored by cup anemometers. Four of the six experiments yielded wind speeds comparable to the dominant speeds obtained from the anemometers. It had been assumed that the common signals yielded positive correlations, but it was suggested that the aerosols might scatter light into one beam and away from the other, making the correlations negative. If there is an equal likelihood of positive and negative correlations by the common signal, the resulting correlation does not have a maximum value at the desired transit time. This may have been the case for the two remaining experiments. The possibility also existed that the beam separations of the two remaining experiments may have been too long, so that there were no signals common to both beams. It is concluded that the cross beam technique for measuring atmospheric winds works some of the time. Although the present setup cannot be used on an operational basis, the concepts may prove successful using artificial light sources or wavelengths other than those in the visual range.
dc.format.mediumreports
dc.identifier.urihttp://hdl.handle.net/10217/52665
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991012768039703361
dc.relationTA7.C6 CER 70/71-13
dc.relation.ispartofCivil Engineering Reports
dc.relation.ispartofCER, 70/71-13
dc.relation.isversionofHablutzel, Benjamin C., Cross Beam Wind Measuring Techniques. (Unpublished thesis (M.S.)). Colorado State University, 1970.
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subject.lcshWinds -- Measurement
dc.titleCross beam wind measuring techniques
dc.typeText
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