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14- by 22-Foot Subsonic Tunnel Laser Velocimeter UpgradeA 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.
Document ID
20120016716
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Meyers, James F.
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Lee, Joseph W.
(NASA Langley Research Center Hampton, VA, United States)
Cavone, Angelo A.
(ATK Aerospace Systems Hampton, VA, United States)
Fletcher, Mark T.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 26, 2013
Publication Date
November 1, 2012
Subject Category
Instrumentation And Photography
Report/Patent Number
NF1676L-15530
NASA/TM-2012-217781
L-20201
Funding Number(s)
WBS: WBS 380046.02.07.03.03.01
Distribution Limits
Public
Copyright
Public Use Permitted.
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