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Development of a new laser Doppler velocimeter for the Ames High Reynolds Channel No. 2A new two-channel laser Doppler velocimeter developed for the Ames High Reynolds Channel No. 2 is described. Design features required for the satisfactory operation of the optical system in the channel environment are discussed. Fiber optics are used to transmit the megahertz Doppler signal to the photodetectors located outside the channel pressure vessel, and provision is made to isolate the optical system from pressure and thermal strain effects. Computer-controlled scanning mirrors are used to position the laser beams in the channel flow. Techniques used to seed the flow with 0.5-micron-diam polystyrene spheres avoiding deposition on the test-section windows and porous boundary-layer removal panels are described. Preliminary results are presented with a discussion of several of the factors affecting accuracy.
Document ID
19850023164
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Seegmiller, H. L. (NASA Ames Research Center Moffett Field, CA, United States)
Bader, J. B. (NASA Ames Research Center Moffett Field, CA, United States)
Cooney, J. P. (NASA Ames Research Center Moffett Field, CA, United States)
Deyoung, A. (NASA Ames Research Center Moffett Field, CA, United States)
Donaldson, R. W., Jr. (NASA Ames Research Center Moffett Field, CA, United States)
Gunter, W. D., Jr. (NASA Ames Research Center Moffett Field, CA, United States)
Harrison, D. R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1985
Subject Category
Instrumentation And Photography
Report/Patent Number
REPT-85289
NASA-TM-86772
NAS 1.15:86772
Accession Number
85N31477
Funding Number(s)
PROJECT: RTOP 506-51-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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