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Demonstration and analysis of filtered rayleigh scattering flow field diagnostic system
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Miles, Richard B. Lempert, Walter R. Forkey, Joseph N. |
| Copyright Year | 1996 |
| Description | Filtered Rayleigh Scattering (FRS) is a diagnostic technique which measures velocity, temperature, and pressure by determining Doppler shift, total intensity, and spectral line shape of laser induced Rayleigh-Brillouin scattering. In the work reported here, this is accomplished by using a narrow line width, injection seeded Nd-YAG laser sheet to induce Rayleigh-Brillouin scattering from a gas flow. This light is passed through an optical notch filter, and transmitted light is imaged onto an intensified charge coupled display (CCD) camera. By monitoring the grayscale value at a particular pixel while the laser frequency is tuned, the convolution between the Rayleigh-Brillouin scattering profile and the filter transmission profile is attained. Since the filter profile can be independently measured, it can be deconvolved from the measuring signal, yielding the Rayleigh-Brillouin scattering profile. From this profile, flow velocity, temperature, and pressure are determined. In this paper the construction and characterization of the optical notch filter and a newly developed frequency apparatus are discussed. |
| File Size | 384936 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960049952 |
| Archival Resource Key | ark:/13960/t6159hs9r |
| Language | English |
| Publisher Date | 1996-08-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Optical Filters Rayleigh Scattering Line Shape Yag Lasers Doppler Effect Spectral Line Width Temperature Measurement Ccd Cameras Gas Flow Brillouin Effect Injection Lasers Flow Velocity Pressure Measurement Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
