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Titolo:
Flow field imaging through sharp-edged atomic and molecular 'notch' filters
Autore:
Miles, RB; Yalin, AP; Tang, Z; Zaidi, SH; Forkey, JN;
Indirizzi:
Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA PrincetonUniv Princeton NJ USA 08544 erosp Engn, Princeton, NJ 08544 USA Stanford Univ, HTGL, Stanford, CA 94305 USA Stanford Univ Stanford CA USA94305 rd Univ, HTGL, Stanford, CA 94305 USA Univ Penn, Penn Muscle Inst, Sch Med, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 , Sch Med, Philadelphia, PA 19104 USA
Titolo Testata:
MEASUREMENT SCIENCE & TECHNOLOGY
fascicolo: 4, volume: 12, anno: 2001,
pagine: 442 - 451
SICI:
0957-0233(200104)12:4<442:FFITSA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
VAPOR FILTERS; RAYLEIGH-SCATTERING; VELOCIMETRY; TEMPERATURE; RAMAN; MODEL; LASER; LIDAR;
Keywords:
flow field imaging; atomic filters; molecular filters; velocity; temperature; pressure; background suppression; wide field of view; Rayleigh scattering; 'notch' filters; blocking filters; flow field diagnostics; Thomson scattering; spectroscopy; iodine; mercury; rubidium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Miles, RB Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USAPrinceton Univ Princeton NJ USA 08544 , Princeton, NJ 08544 USA
Citazione:
R.B. Miles et al., "Flow field imaging through sharp-edged atomic and molecular 'notch' filters", MEAS SCI T, 12(4), 2001, pp. 442-451

Abstract

Sharp cut-off atomic and molecular notch filters simultaneously provide high spectral resolution and allow imaging by collecting light over a wide field of view. Many important properties of flow fields can be observed by ima,sing light elastically scattered from small particles, molecules or electrons. In order to extract information about the flow field from elastic scattering, the spectrum of the scattering must be resolved and the backgroundscattering must be suppressed. Very high resolution, on the order of a fewtens of megahertz, is usually required. The spectrum of the scattered light is broadened and shifted by the motion of the scatterers. For particles, which have relatively Little thermal or acoustic motion, the spectral shiftis only a function of the velocity. For molecules, the scattering spectrumis a function of the temperature, velocity and pressure of the gas as wellas its composition. For electrons, the spectrum is a function of the electron temperature and electron number density in a plasma. In this paper, sharp edged notch filters made of rubidium, iodine or mercury vapour are used to image shock wave and boundary layer structure by Rayleigh scattering from particles, to image gas pressure, velocity and temperature by molecular Rayleigh scattering, and to measure electron temperature and electron numberdensity by Thomson scattering. For molecular scattering, filter transmission is generally a function of velocity, temperature and pressure, but, under some circumstances, it is a function of only one or two variables, so a notch filter can provide single-pulse images of a specific flow field parameter.

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Documento generato il 25/11/20 alle ore 00:48:41