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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 31 — Nov. 1, 2005
  • pp: 6692–6700

Hydroxyl tagging velocimetry in a supersonic flow over a cavity

Robert W. Pitz, Michael D. Lahr, Zachary W. Douglas, Joseph A. Wehrmeyer, Shengteng Hu, Campbell D. Carter, Kuang-Yu Hsu, Chee Lum, and Manoochehr M. Koochesfahani  »View Author Affiliations

Applied Optics, Vol. 44, Issue 31, pp. 6692-6700 (2005)

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Hydroxyl tagging velocimetry (HTV) measurements of velocity were made in a Mach 2 (M 2) flow with a wall cavity. In the HTV method, ArF excimer laser (193 nm) beams pass through a humid gas and dissociate H2O into H + OH to form a tagging grid of OH molecules. In this study, a 7 × 7 grid of hydroxyl (OH) molecules is tracked by planar laser-induced fluorescence. The grid motion over a fixed time delay yields about 50 velocity vectors of the two-dimensional flow in the plane of the laser sheets. Velocity precision is limited by the error in finding the crossing location of the OH lines written by the excimer tag laser. With a signal-to-noise ratio of about 10 for the OH lines, the determination of the crossing location is expected to be accurate within ±0.1 pixels. Velocity precision within the freestream, where the turbulence is low, is consistent with this error. Instantaneous, single-shot measurements of two-dimensional flow patterns were made in the nonreacting M 2 flow with a wall cavity under low- and high-pressure conditions. The single-shot profiles were analyzed to yield mean and rms velocity profiles in the M 2 nonreacting flow.

© 2005 Optical Society of America

OCIS Codes
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7250) Remote sensing and sensors : Velocimetry
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

Original Manuscript: February 7, 2005
Revised Manuscript: May 19, 2005
Manuscript Accepted: March 17, 2005
Published: November 1, 2005

Robert W. Pitz, Michael D. Lahr, Zachary W. Douglas, Joseph A. Wehrmeyer, Shengteng Hu, Campbell D. Carter, Kuang-Yu Hsu, Chee Lum, and Manoochehr M. Koochesfahani, "Hydroxyl tagging velocimetry in a supersonic flow over a cavity," Appl. Opt. 44, 6692-6700 (2005)

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