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Applied Optics

Applied Optics


  • Vol. 32, Iss. 21 — Jul. 20, 1993
  • pp: 4074–4087

Continuous wave dye-laser technique for simultaneous, spatially resolved measurements of temperature, pressure, and velocity of NO in an underexpanded free jet

Michael D. Di Rosa, Albert Y. Chang, and Ronald K. Hanson  »View Author Affiliations

Applied Optics, Vol. 32, Issue 21, pp. 4074-4087 (1993)

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Gas dynamic quantities within an underexpanded nitrogen free jet, seeded with 0.5% NO, were measured nonintrusively by using an intracavity-doubled, rapid-tuning, cw ring dye laser. The UV beam passed obliquely through the jet axis, and its frequency repetitively scanned across adjacent rotational lines in the NO gamma band near 225 nm at a rate of 4 kHz. Spatially resolved excitation scans were obtained by monitoring the induced broadband fluoresence. Modeling the Doppler-shifted excitation scans with Voigt profiles permitted simultaneous determinations of NO velocity, rotational temperature, and pressure. Zero Doppler shift was referenced to an absorption trace obtained across a static cell and recorded concurrently with the excitation scan. Typically, the measured and predicted axial distributions agreed within 10%. At high Mach numbers there was evidence of rotational freezing of NO.

© 1993 Optical Society of America

Original Manuscript: March 20, 1992
Published: July 20, 1993

Michael D. Di Rosa, Albert Y. Chang, and Ronald K. Hanson, "Continuous wave dye-laser technique for simultaneous, spatially resolved measurements of temperature, pressure, and velocity of NO in an underexpanded free jet," Appl. Opt. 32, 4074-4087 (1993)

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