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Spatially and temporally-resolved multi-parameter interferometric rayleigh scattering
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bivolaru, Daniel Cutler, Andrew D. Danehy, Paul M. |
| Copyright Year | 2011 |
| Description | A novel approach to simultaneously measure the translational temperature, bulk velocity, and density in gases by collecting, referencing, and analyzing nanosecond time-scale Rayleigh scattered light from molecules is described. A narrow-band pulsed laser source is used to probe two largely separated measurement locations, one of which is used for reference. The elastically scattered photons containing information from both measurement locations are collected at the same time and analyzed spectrally using a planar Fabry - Perot interferometer. A practical means of referencing the measurement of velocity using the laser frequency, and the density and temperature using the information from the reference measurement location maintained at constant properties is described. To demonstrate the technique single-shot spectra of elastic scattered light are obtained in a near zero velocity H2-air Hencken burner flame and simultaneously in an N2-filled gas cell. A simplified Gaussian distribution model to the scattered light spectra is used to obtain the flame properties. Corrections to this model are applied at lower gas temperatures when the simplified Gaussian approximation is no longer suitable. The near-zero measured velocity as a function of the measured flame temperature, and a comparison of the measured flame density and temperature with the perfect gas law are presented. |
| File Size | 277543 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110003639 |
| Archival Resource Key | ark:/13960/t3tt9m63b |
| Language | English |
| Publisher Date | 2011-01-04 |
| Access Restriction | Open |
| Subject Keyword | Optics Normal Density Functions Laser Outputs Rayleigh Scattering Hydrogen Flame Temperature Elastic Scattering Gas Temperature Nitrogen Pulsed Lasers Narrowband Molecules Ideal Gas Velocity Measurement Fabry-perot Interferometers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
