Title :
Requirements for temperature measurements in nonequilibrium flows using laser-induced O2 fluorescence
Author :
Grinstead, Jay H. ; Laufer, Gabriel
Author_Institution :
Dept. of Mech. & Aerosp. Eng., Virginia Univ., VA, USA
Abstract :
Conditions for temperature measurements in nonequilibrium flows using O2 laser-induced fluorescence (LIF) are presented. A computer model of the LIF process was developed and used to identify pairs of ro-vibronic transitions originating from a single vibrational level and spectrally isolated from ro-vibronic transitions from adjacent vibrational states. ArF lasers, KrF lasers, and anti-Stokes shifted ArF lasers were considered as excitation sources. It was found that the ArF laser can be used for rotational temperature measurement when the vibrational temperature is below 750 K. KrF lasers are suitable for rotational temperature measurement when the vibrational temperature is above 750 K
Keywords :
argon compounds; excimer lasers; krypton compounds; molecular fluorescence; molecular photoexcitation; molecular rotation-vibration; molecular vibronic states; nonequilibrium flow; oxygen; physics computing; spectral methods of temperature measurement; 750 K; ArF lasers; KrF lasers; O2; anti-Stokes shifted ArF lasers; computer model; laser-induced O2 fluorescence; nonequilibrium flows; ro-vibronic transitions; rotational temperature; temperature measurements; vibrational states; vibrational temperature; Aerospace engineering; Fluorescence; Laser excitation; Laser modes; Laser transitions; Rotation measurement; Shock waves; Temperature distribution; Temperature measurement; Vibration measurement;
Conference_Titel :
Instrumentation in Aerospace Simulation Facilities, 1991. ICIASF '91 Record., International Congress on
Conference_Location :
Rockville, MD
DOI :
10.1109/ICIASF.1991.186248
