CW laser strategies for simultaneous, multi-parameter measurements in high-speed gas flowsStrategies utilizing continuous wave (CW) lasers are considered which are capable of simultaneously measuring the flow parameters of velocity, temperature, and pressure at sampling rates exceeding 3 kHz. Velocity is determined from the Doppler shift of the spectral profile, temperature is extracted from intensity ratios of multiple lines, and pressure is measured from either the collision of broadening or the magnitude of absorption. Distinctions between strategies concern the specifics of probe spacies (NO, OH, O2, and H2O) in terms of nominal probe wavelength, equipment, and detection scheme. CW lasers were applied to path-integrated absorption measurements of transient shock-tube flows and spatially resolved laser-induced fluorescence measurements of underexpanded jets.
Document ID
19920074159
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Di Rosa, M. D. (NASA Ames Research Center Moffett Field, CA, United States)
Philippe, L. C. (NASA Ames Research Center Moffett Field, CA, United States)
Arroyo, M. P. (NASA Ames Research Center Moffett Field, CA, United States)
Hanson, R. K. (Stanford University CA, United States)