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Setting up a rayleigh scattering based flow measuring system in a large nozzle testing facility
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gomez, Carlos R. Panda, Jayanta |
| Copyright Year | 2002 |
| Description | A molecular Rayleigh scattering based air density measurement system has been built in a large nozzle testing facility at NASA Glenn Research Center. The technique depends on the light scattering by gas molecules present in air; no artificial seeding is required. Light from a single mode, continuous wave laser was transmitted to the nozzle facility by optical fiber, and light scattered by gas molecules, at various points along the laser beam, is collected and measured by photon-counting electronics. By placing the laser beam and collection optics on synchronized traversing units, the point measurement technique is made effective for surveying density variation over a cross-section of the nozzle plume. Various difficulties associated with dust particles, stray light, high noise level and vibration are discussed. Finally, a limited amount of data from an underexpanded jet are presented and compared with expected variations to validate the technique. |
| File Size | 1202821 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030005479 |
| Archival Resource Key | ark:/13960/t6353m51d |
| Language | English |
| Publisher Date | 2002-11-01 |
| Access Restriction | Open |
| Subject Keyword | Environment Pollution Optical Fibers Rayleigh Scattering Test Facilities Density Measurement Light Scattering Photons Continuous Wave Lasers Plumes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
