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  • 1
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    Time-average measurement of velocity, density, temperature, and turbulence velocity fluctuations using Rayleigh and Mie scattering (2005)
    Springer
    Details
    Publication Date: 2005-05-24
    Print ISSN: 0723-4864
    Electronic ISSN: 1432-1114
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 2
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    Effect of collisions on thomson scattering in a magnetic field with unequal electron and ion temperatures and electron drift (1971)
    American Geophysical Union
    Details
    Publication Date: 1971-03-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 3
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    Rayleigh-Brillouin scattering to determine one-dimensional temperature and number density profiles of a gas flow field (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Rayleigh-Brillouin spectra for heated nitrogen gas were measured by imaging the output of a Fabry-Perot interferometer onto a CCD array. The spectra were compared with the theoretical 6-moment model of Rayleigh-Brillouin scattering convolved with the Fabry-Perot instrument function. Estimates of the temperature and a dimensionless parameter proportional to the number density of the gas as functions of position in the laser beam were calculated by least-squares deviation fits between theory and experiment.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 31; 15, M
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Zoom lens compensator for a cylindrical window in laser anemometer uses (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In laser anemometer systems, the flow fields under study are typically enclosed by a window. Aberration of a flat window can be corrected by a shift of the object distance. A zooming correction lens elimates the astigmatism caused by a thick cylindrical window and yields diffraction-limited performance for a monochromatic laser anemometer system. The effects of residual anamorphic distortion are discussed, and procedures for correcting these effects are presented.
    Keywords: OPTICS
    Type: Applied Optics (ISSN 0003-6935); 26; 4603-461
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Rayleigh-Brillouin scattering for high-pressure gas temperature measurements (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An experiment was set up to evaluate the feasibility of using Rayleigh-Brillouin scattering as a diagnostic technique for measuring gas temperature in high pressure environments, such as the Space Shuttle Main Engine (SSME) Preburner. A high pressure furnace is used as the scattering chamber. Either nitrogen or hydrogen may be used. An argon ion laser beam is focused into the furnace. Light backscattering from the gas in the furnace is collected and analyzed with a 5-pass scanning Fabry-Perot interferometer and photon counting electronics. The multi-pass configuration provides the high frequency selectively needed to measure the Brillouin peaks in the presence of large amounts of spuriously scattered light at the laser frequency. Preliminary measurements were made at room temperature in nitrogen at pressures up to 2000 psia. The free spectral range of the interferometer and frequency separation of the Brillouin peaks are determined from measured spectra. Temperature measurements are then obtained using the simple continuum theory with low frequency values of specific heat ratio and shear viscosity. The measured temperatures are within 10 percent of the true value.
    Keywords: LASERS AND MASERS
    Type: Structural Integrity and Durability of Reusable Space Propulsion Systems; p 21-27
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Gas temperature and density measurements based on spectrally resolved Rayleigh-Brillouin scattering (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The use of molecular Rayleigh scattering for measurements of gas density and temperature is evaluated. The technique used is based on the measurement of the spectrum of the scattered light, where both temperature and density are determined from the spectral shape. Planar imaging of Rayleigh scattering from air using a laser light sheet is evaluated for ambient conditions. The Cramer-Rao lower bounds for the shot-noise limited density and temperature measurement uncertainties are calculated for an ideal optical spectrum analyzer and for a planar mirror Fabry-Perot interferometer used in a static, imaging mode. With this technique, a single image of the Rayleigh scattered light can be analyzed to obtain density (or pressure) and temperature. Experimental results are presented for planar measurements taken in a heated air stream.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, The 1992 NASA Langley Measurement Technology Conference: Measurement Technology for Aerospace Applications in High-Temperature Environments; p 355-374
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Laser anemometry: A status report (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A laser anemometer system is being developed for the warm turbine facility as part of the HOST program. The system will be built using results obtained from the analytical and experimental research program. The status report of the laser anemometry applications research effort is presented. The designs for the turbine casing, the windows, and the positioning system were completed. A block diagram of the laser anemometer system, signal processing scheme, and computer system is given.
    Keywords: LASERS AND MASERS
    Type: Turbine Engine Hot Section Technology 1986; p 61-68
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Combined fringe and Fabry-Perot laser anemometer for 3 component velocity measurements in turbine stator cascade facility (1986)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A laser anemometer is described that was developed for use in a 508 mm diameter annular turbine stator cascade facility. All three velocity components are measured through a single restricted optical port, both within the stator vane row and downstream of the vanes. The measurements are made through a cylindrical window in the casing that matches the tip radius of the cascade. The stator tested has a contoured hub endwall that results in a large radial flow near the hub. The anemometer uses a standard fringe configuration (LFA) with a fluorescent aerosol seed to measure the axial and circumferential velocity components. The radial component is measured with a confocal Fabry-Perot interferometer. The two configurations are combined in a single optical system and can operate simultaneously. Data are presented to illustrate the capabilities of the system.
    Keywords: ENGINEERING (GENERAL)
    Type: AGARD Advanced Instrumentation for Aero Engine Components; 15 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Screech Noise Generation From Supersonic Underexpanded Jets Investigated (2000)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: Many supersonic military aircraft and some of the modern civilian aircraft (such as the Boeing 777) produce shock-associated noise. This noise is generated from the jet engine plume when the engine nozzle is operated beyond the subsonic operation limit to gain additional thrust. At these underexpanded conditions, a series of shock waves appear in the plume. The turbulent vortices present in the jet interact with the shock waves and produce the additional shock-associated noise. Screech belongs to this noise category, where sound is generated in single or multiple pure tones. The high dynamic load associated with screech can damage the tailplane. One purpose of this study at the NASA Glenn Research Center at Lewis Field was to provide an accurate data base for validating various computational fluid dynamics (CFD) codes. These codes will be used to predict the frequency and amplitude of screech tones. A second purpose was to advance the fundamental physical understanding of how shock-turbulence interactions generate sound. Previously, experiments on shock-turbulence interaction were impossible to perform because no suitable technique was available. As one part of this program, an optical Rayleigh-scattering measurement technique was devised to overcome this difficulty.
    Keywords: Acoustics
    Type: Research and Technology 1999; NASA/TM-2000-209639
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Molecular Rayleigh Scattering Techniques Developed for Measuring Gas Flow Velocity, Density, Temperature, and Turbulence (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: Nonintrusive optical point-wise measurement techniques utilizing the principles of molecular Rayleigh scattering have been developed at the NASA Glenn Research Center to obtain time-averaged information about gas velocity, density, temperature, and turbulence, or dynamic information about gas velocity and density in unseeded flows. These techniques enable measurements that are necessary for validating computational fluid dynamics (CFD) and computational aeroacoustic (CAA) codes. Dynamic measurements allow the calculation of power spectra for the various flow properties. This type of information is currently being used in jet noise studies, correlating sound pressure fluctuations with velocity and density fluctuations to determine noise sources in jets. These nonintrusive techniques are particularly useful in supersonic flows, where seeding the flow with particles is not an option, and where the environment is too harsh for hot-wire measurements.
    Keywords: Quality Assurance and Reliability
    Type: Research and Technology 2004; NASA/TM-2005-213419
    Format: application/pdf
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