CW laser strategies for multi-parameter measurements of high-speed flows containing either NO or O2Measurements of gasdynamic quantities were performed using a rapid-tuning CW dye laser to resolve Doppler-shifted spectral features in either the O2 Schumann-Runge bands or the NO gamma band near 225 nm. With the rapid-tuning capability, spectral features were acquired at a repetition rate of 4 kHz. Monitoring O2 transitions provided estimates of velocities while monitoring collision-broadened NO line pairs provided simultaneous measurements of velocity, temperature and pressure. Experiments were first performed in absorption within the transient one-dimensional flows generated in a shock tube. Agreement between measured and theoretical values, as calculated from one-dimensional shock relations, was typically better than 5 percent. The method was extended to fluorescence detection of NO in a static cell. Temperature and pressure were extracted from recorded profiles, and the results agreed well with expected values.
Document ID
19910036846
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dirosa, M. D. (Stanford Univ. CA, United States)
Chang, A. Y. (Stanford Univ. CA, United States)
Davidson, D. F. (Stanford Univ. CA, United States)
Hanson, R. K. (Stanford University CA, United States)