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Accession Number
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N20120012431
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Title
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Modernization of a Long-Focal Length Fringe-Type Laser Velocimeter.
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Publication Date
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Jul 2012
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Media Count
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11p
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Personal Author
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A. A. Cavone J. F. Meyers J. W. Lee M. T. Fletcher
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Abstract
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A long-focal length laser velocimeter constructed in the early 1980's was upgraded using current technology to improve usability, reliability and future serviceability. The original, free-space optics were replaced with a state-of-the-art fiber-optic subsystem which allowed most of the optics, including the laser, to be remote from the harsh tunnel environment. General purpose high-speed digitizers were incorporated in a standard modular data acquisition system, along with custom signal processing software executed on a desktop computer, served as the replacement for the signal processors. The resulting system increased optical sensitivity with real-time signal/data processing that produced measurement precisions exceeding those of the original system. Monte Carlo simulations, along with laboratory and wind tunnel investigations were used to determine system characteristics and measurement precision.
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Keywords
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Analog to digital converters
Fiber optics
Lasers
Monte Carlo method
Real time operation
Reliability
Signal analyzers
Signal processing
Simulation
Wind tunnels
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Source Agency
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National Aeronautics and Space Administration
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NTIS Subject Category
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46C - Optics & Lasers
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Corporate Author
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National Aeronautics and Space Administration, Hampton, VA. Langley Research Center.
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Document Type
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Conference proceedings
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Title Note
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N/A
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NTIS Issue Number
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1303
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Contract Number
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N/A
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