Abstract
With a first application of semiconductor lasers to absorption measurements of seeded atomic Rb in high-enthalpy flow fields, a diagnostic technique for time-resolved determination of flow velocity and gas temperature with a line-shape analysis was developed. In our measurements a GaAlAs diode laser was used to scan repetitively at 15 kHz over 1.3 cm-1 across the D2 resonance transition (5S 1/2 → 5P 3/2, 780.2 nm) of seeded atomic Rb to obtain multiple absorption line shapes. The time-dependent signal contains highly resolved spectral line-shape information, which we interpret by fitting the spectrally resolved line shapes to Voigt profiles. Kinetic temperatures in the range 900–1400 K and gas velocities in the range 3900–6200 ms-1 were obtained from the Doppler-broadened component of the line shape and from the Doppler shift, respectively, of the absorption frequency.
© 1998 Optical Society of America
Full Article | PDF ArticleMore Like This
Wim M. Ruyten, Michael S. Smith, Linwood L. Price, and William D. Williams
Appl. Opt. 37(12) 2334-2339 (1998)
David F. Davidson, Albert Y. Chang, Michael D. DiRosa, and Ronald K. Hanson
Appl. Opt. 30(18) 2598-2608 (1991)
M. P. Arroyo, S. Langlois, and R. K. Hanson
Appl. Opt. 33(15) 3296-3307 (1994)