NDLI: Interferometric rayleigh scattering measurement system

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Interferometric rayleigh scattering measurement system

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	2008
Description	A method and apparatus for performing simultaneous multi-point measurements of multiple velocity components in a gas flow is described. Pulses of laser light are directed to a measurement region of unseeded gas to produce Rayleigh or Mie scattered light in a plurality of directions. The Rayleigh or Mie scattered light is collected from multiple directions and combined in a single collimated light beam. The Rayleigh or Mie scattered light is then mixed together with a reference laser light before it is passed through a single planar Fabry-Perot interferometer for spectral analysis. At the output of the interferometer, a high-sensitivity CCD camera images the interference fringe pattern. This pattern contains the spectral and spatial information from both the Rayleigh scattered light and the reference laser light. Interferogram processing software extracts and analyzes spectral profiles to determine the velocity components of the gas flow at multiple points in the measurement region. The Rayleigh light rejected by the interferometer is recirculated to increase the accuracy and the applicability of the method for measurements at high temperatures without requiring an increase in the laser energy.
File Size	1045390
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090006537
Archival Resource Key	ark:/13960/t3dz5758w
Language	English
Publisher Date	2008-08-19
Access Restriction	Open
Subject Keyword	Patents Laser Outputs Rayleigh Scattering Ccd Cameras Gas Flow Spectrum Analysis Flow Measurement Flow Velocity Velocity Measurement Interferometers Interferometry Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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