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A microcomputer based frequency-domain processor for laser Doppler anemometryA prototype multi-channel laser Doppler anemometry (LDA) processor was assembled using a wideband transient recorder and a microcomputer with an array processor for fast Fourier transform (FFT) computations. The prototype instrument was used to acquire, process, and record signals from a three-component wind tunnel LDA system subject to various conditions of noise and flow turbulence. The recorded data was used to evaluate the effectiveness of burst acceptance criteria, processing algorithms, and selection of processing parameters such as record length. The recorded signals were also used to obtain comparative estimates of signal-to-noise ratio between time-domain and frequency-domain signal detection schemes. These comparisons show that the FFT processing scheme allows accurate processing of signals for which the signal-to-noise ratio is 10 to 15 dB less than is practical using counter processors.
Document ID
19880017250
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Horne, W. Clifton (NASA Ames Research Center Moffett Field, CA, United States)
Adair, Desmond (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1988
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.15:100998
NASA-TM-100998
A-88173
Accession Number
88N26634
Funding Number(s)
PROJECT: RTOP 505-61-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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