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Study of photon correlation techniques for processing of laser velocimeter signalsThe objective was to provide the theory and a system design for a new type of photon counting processor for low level dual scatter laser velocimeter (LV) signals which would be capable of both the first order measurements of mean flow and turbulence intensity and also the second order time statistics: cross correlation auto correlation, and related spectra. A general Poisson process model for low level LV signals and noise which is valid from the photon-resolved regime all the way to the limiting case of nonstationary Gaussian noise was used. Computer simulation algorithms and higher order statistical moment analysis of Poisson processes were derived and applied to the analysis of photon correlation techniques. A system design using a unique dual correlate and subtract frequency discriminator technique is postulated and analyzed. Expectation analysis indicates that the objective measurements are feasible.
Document ID
19770012817
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Mayo, W. T., Jr. (Science Applications, Inc. Atlanta, GA, United States)
Date Acquired
September 3, 2013
Publication Date
February 1, 1977
Publication Information
Publisher: NASA
Subject Category
Computer Operations And Hardware
Report/Patent Number
NASA-CR-2780
Accession Number
77N19761
Funding Number(s)
PROJECT: DA PROJ. 1F1-61102-A-35B
CONTRACT_GRANT: NAS1-13737
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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