A molecular Rayleigh scattering technique is developed to measure gas velocity, temperature, and density in unseeded gas flows at sampling rates up to 32 kHz. A high-power continuous-wave laser beam is focused at a point in an air flowfleld, and Rayleigh scattered light is collected and fiber-optically transmitted to a Fabry-Perot interferometer for spectral analysis. Photomultiplier tubes operated in the photon-counting mode allow highfrequency sampling ofthe total signal level and the circular interference pattern to provide density, temperature, and velocity measurements. Mean and root-mean-square fluctuation measurements in both an electrically heated jet facility with a 10-mm-diam nozzle and in a hydrogen-combustor-heated-jet facility with a 50.8-mm-diam nozzle at NASA John H. Glenn Research Center at Lewis Field are presented. Measurements are compared with hot-wire anemometry, cold-wire thermometry, and temporally resolved particle image velocimetry to validate the Rayleigh technique.
Multiproperty measurements at high sampling rates using Rayleigh scattering
Messung mehrerer Eigenschaften mit hoher Abtastfrequenz mit Hilfe der Rayleigh-Streuung
AIAA Journal ; 47 , 4 ; 850-862
2009
13 Seiten, 23 Bilder, 34 Quellen
Article (Journal)
English
Rayleigh-Streuung , Geschwindigkeitsmessung , Temperaturverteilung , Dichtemessung , Strömungsfeld , Luftströmung , Fabry-Perot-Interferometer , Faseroptik , Photomultiplier , Photonenzähler , Abtastfrequenz , Dichtefluktuation , Strahlausfluss , Testanlage , Vergleichsanalyse , Anemometrie , Thermometrie , Teilchenabbildgeschwindigkeitsmessung
Multiproperty Measurements at High Sampling Rates Using Rayleigh Scattering
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