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Applied Optics

Applied Optics


  • Vol. 38, Iss. 18 — Jun. 20, 1999
  • pp: 3924–3930

Laser-induced fluorescence measurements of translational temperature and relative cycle number by use of optically pumped trace-sodium vapor

Chris C. Dobson  »View Author Affiliations

Applied Optics, Vol. 38, Issue 18, pp. 3924-3930 (1999)

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Sodium fluorescence induced by a narrow-bandwidth tunable laser has been used to measure temperature, pressure, axial velocity, and species concentrations in wind tunnels, rocket engine exhausts, and the upper atmosphere. Optical pumping of the ground states of the sodium, however, can radically alter the shape of the laser-induced fluorescence excitation spectrum, complicating such measurements. Here a straightforward extension of rate equations originally proposed to account for the features of the pumped spectrum is used to make temperature measurements from spectra taken in pumped vapor. Also determined from the spectrum is the relative fluorescence cycle number, which has application to measurement of diffusion rate and transverse flow velocity. The accuracy of both the temperature and the cycle-number measurements is comparable with that of temperature measurements made in the absence of pumping.

© 1999 Optical Society of America

OCIS Codes
(020.2930) Atomic and molecular physics : Hyperfine structure
(020.3690) Atomic and molecular physics : Line shapes and shifts
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6210) Spectroscopy : Spectroscopy, atomic

Original Manuscript: October 26, 1998
Revised Manuscript: January 26, 1999
Published: June 20, 1999

Chris C. Dobson, "Laser-induced fluorescence measurements of translational temperature and relative cycle number by use of optically pumped trace-sodium vapor," Appl. Opt. 38, 3924-3930 (1999)

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  1. R. B. Miles, “Resonant Doppler velocimeter,” Phys. Fluids 18, 751–752 (1975). [CrossRef]
  2. M. Zimmermann, R. B. Miles, “Hypersonic-helium-flow-field measurements with the resonant Doppler velocimeter,” Appl. Phys. Lett. 37, 885–887 (1980). [CrossRef]
  3. S. Cheng, M. Zimmermann, R. B. Miles, “Supersonic-nitrogen flow-field measurements with the resonant Doppler velocimeter,” Appl. Phys. Lett. 43, 143–145 (1983). [CrossRef]
  4. C. W. Braiser, R. G. Porter, “Development of a laser-induced fluorescence system for application to rocket plumes,” (Arnold Engineering Development Center, Arnold Air Force Base, Tenn., 1993).
  5. K. H. Fricke, U. von Zahn, “Mesopause temperatures derived from probing the hyperfine structure of the D2 resonance line of sodium by lidar,” J. Atmos. Terr. Phys. 47, 499–512 (1985). [CrossRef]
  6. R. Walkup, A. Spielfiedel, W. D. Phillips, D. E. Pritchard, “Line-shape changes due to optical pumping of Na in buffer gas,” Phys. Rev. A 23, 1869–1873 (1981). [CrossRef]
  7. W. M. Fairbank, T. W. Hänsch, A. L. Schawlow, “Absolute measurement of very low sodium-vapor densities using laser induced fluorescence,” J. Opt. Soc. Am. 65, 199–204 (1975). [CrossRef]
  8. C. C. Dobson, C. C. Sung, “Laser induced optical pumping measurements of cross sections for fine and hyperfine structure transitions in sodium induced by collisions with helium and argon atoms,” Phys. Rev. A 59, 3402–3407 (1999). [CrossRef]
  9. C. C. Dobson, “Laser induced fluorescence measurements of thermal and statistical properties of a gas using optically pumped sodium vapor,” Ph.D. dissertation (University of Alabama at Huntsville, Huntsville, Ala., 1998).
  10. W. H. Press, B. P. Flannery, S. A. Teukolsky, W. T. Vetterling, Numerical Recipes (Cambridge U. Press, New York, 1986).
  11. M. J. Jongerius, A. R. D. Van Bergen, T. J. Hollander, C. Th. Alkemade, “An experimental study of the collisional broadening of the Na-D lines by Ar, N2, and H2 perturbers in flames and vapor cells. I. The line core,” J. Quant. Spectrosc. Radiat. Transfer 25, 1–18 (1981). [CrossRef]
  12. D. G. McCartan, J. M. Farr, “Collisional broadening of the sodium resonance lines by noble gases,” J. Phys. B 9, 985–994 (1976). [CrossRef]
  13. J. T. Fourkas, T. R. Brewer, H. Kim, M. D. Fayer, “Picosecond polarization-selective transient grating experiments in sodium-seeded flames,” J. Chem. Phys. 95, 5775–5784 (1991). [CrossRef]
  14. L. W. Anderson, A. T. Ramsey, “Study of the spin-relaxation times and the effects of spin-exchange collisions in an optically oriented sodium vapor,” Phys. Rev. 132, 712–723 (1963). [CrossRef]

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