Temperature measurements in hypersonic air flows using laser-induced O2 fluorescenceAn investigation is reported of the use of laser-induced fluorescence on oxygen for the measurement of air temperature and its fluctuations owing to turbulence in hypersonic wind tunnel flows. The results show that for temperatures higher than 60 K and densities higher than 0.01 amagat, the uncertainty in the temperature measurement can be less than 2 percent if it is limited by photon-statistical noise. The measurement is unaffected by collisional quenching and, if the laser fluence is kept below 1.5 J/sq cm, it is also unaffected by nonlinear effects which are associated with depletion of the absorbing states.
Document ID
19880066605
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Laufer, Gabriel (Analatom, Inc. Sunnyvale, CA, United States)
Mckenzie, Robert L. (NASA Ames Research Center Moffett Field, CA, United States)