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14- by 22-Foot Subsonic Tunnel Laser Velocimeter Upgrade
NTRS Full-Text: Click to View  [PDF Size: 27.4 MB]
Author and Affiliation:
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)
Abstract: 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.
Publication Date: Nov 01, 2012
Document ID:
20120016716
(Acquired Dec 10, 2012)
Subject Category: INSTRUMENTATION AND PHOTOGRAPHY
Report/Patent Number: NASA/TM-2012-217781, L-20201, NF1676L-15530
Document Type: Technical Report
Contract/Grant/Task Num: WBS 380046.02.07.03.03.01
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 793p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ANALOG TO DIGITAL CONVERTERS; LASER DOPPLER VELOCIMETERS; SUBSONIC WIND TUNNELS; WIND TUNNEL TESTS; DATA ACQUISITION; MONTE CARLO METHOD; REAL TIME OPERATION; SIGNAL ANALYZERS; SIGNAL PROCESSING
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