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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 30 — Oct. 20, 1998
  • pp: 7070–7075

Application of a diode-laser absorption technique with the D2 transition of atomic Rb for hypersonic flow-field measurements

Ole Trinks and Walter H. Beck  »View Author Affiliations


Applied Optics, Vol. 37, Issue 30, pp. 7070-7075 (1998)
http://dx.doi.org/10.1364/AO.37.007070


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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 (5S1/2 → 5P3/2, 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

OCIS Codes
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(300.1030) Spectroscopy : Absorption
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6260) Spectroscopy : Spectroscopy, diode lasers

History
Original Manuscript: March 4, 1998
Revised Manuscript: June 22, 1998
Published: October 20, 1998

Citation
Ole Trinks and Walter H. Beck, "Application of a diode-laser absorption technique with the D2 transition of atomic Rb for hypersonic flow-field measurements," Appl. Opt. 37, 7070-7075 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-30-7070

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