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Pilot selection criteria for the AH-64 helicopter.

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Author
Diamond, Richard C.
Date
1982
Advisor
Creighton, J. W.
Henn, James
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Abstract
An experimental study was performed to devise a technique for measuring the volume backscattering from sediments. This experimental technique has never been performed in the laboratory. The volume backscattering was to be determined by comparing the echoes returned from the sediment with the echo returned from the water/air interface. Measurements made on echoes returned from the water/air interface indicated that the apparatus, data acquisition system, and analysis system were performing correctly. Two types of sediments (fine sand and aggregate gravel) were used. The fine sand did not produce measureable volume backscattering and the aggregate showed results that depended on the region of sediment ensonified. It is recommended that a sediment more homogeneous than the aggregate, but with more backscattering than the fine sand be used in future studies.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/20300
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  • 1. Thesis and Dissertation Collection, all items

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Showing items related by title, author, creator and subject.

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    Preliminary studies of a technique for measuring the volume backscattering from sediments 

    Diaz, Federico R. (1986);
    An experimental study was performed to devise a technique for measuring the volume backscattering from sediments. This experimental technique has never been performed in the laboratory. The volume backscattering was to be ...
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    Remote sensing of ocean sediment volume reverberation 

    Chang, Chin-wen (1986-12);
    An experimental study was performed to establish a technique for measuring the volume reverberation from ocean sediments. Two types of sediments (aggregate and fine sand) were used in this study. The inhomogeneity within ...
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    Turbulence-Resolving Coherent Acoustic Sediment Flux Probe Device and Method for Using 

    Stanton, Timothy Peter (The United States of America as represented by the Secretary of the Navy, Washington, DC (US), 2001-07-17);
    This invention describes a new method to estimate the sediment flux in front of a Coherent Acoustic Sediment Probe (CASP) instrument. Also, described is a newly invented Bistatic Doppler Velocity and Sediment Profiler (BDVSP) ...
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