Abstract

A technique is described for imaging components of velocity in a gaseous flow field by using pulsed planar laser-induced fluorescence. The technique is based on the fluorescence detection of Doppler-shifted absorption that results when a spectrally narrow absorption line is excited with a broadband laser. Results obtained in a Mach 7 underexpanded supersonic jet, seeded with NO, are presented. The practical extension of this technique to single-shot measurements of two velocity components is discussed.

© 1989 Optical Society of America

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References

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  1. R. M. Measures, J. Appl. Phys. 39, 5232 (1968).
    [CrossRef]
  2. B. Hiller, R. K. Hanson, Appl. Opt. 27, 33 (1988).
    [CrossRef] [PubMed]
  3. R. K. Hanson, in 21st Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1986), p. 1677.
  4. J. C. McDaniel, B. Hiller, R. K. Hanson, Opt. Lett. 8, 51 (1983).
    [CrossRef] [PubMed]
  5. S. Cheng, M. Zimmerman, R. B. Miles, Phys. Fluids 26, 874 (1983).
    [CrossRef]
  6. S. Crist, P. M. Sherman, D. R. Glass, AIAA J. 4, 68 (1966).
    [CrossRef]
  7. H. Askenas, F. S. Sherman, in Rarefied Gasdynamics, J. H. de Leeuw, ed. (Academic, New York, 1966), Vol. II, p. 84.

1988 (1)

1983 (2)

S. Cheng, M. Zimmerman, R. B. Miles, Phys. Fluids 26, 874 (1983).
[CrossRef]

J. C. McDaniel, B. Hiller, R. K. Hanson, Opt. Lett. 8, 51 (1983).
[CrossRef] [PubMed]

1968 (1)

R. M. Measures, J. Appl. Phys. 39, 5232 (1968).
[CrossRef]

1966 (1)

S. Crist, P. M. Sherman, D. R. Glass, AIAA J. 4, 68 (1966).
[CrossRef]

Askenas, H.

H. Askenas, F. S. Sherman, in Rarefied Gasdynamics, J. H. de Leeuw, ed. (Academic, New York, 1966), Vol. II, p. 84.

Cheng, S.

S. Cheng, M. Zimmerman, R. B. Miles, Phys. Fluids 26, 874 (1983).
[CrossRef]

Crist, S.

S. Crist, P. M. Sherman, D. R. Glass, AIAA J. 4, 68 (1966).
[CrossRef]

Glass, D. R.

S. Crist, P. M. Sherman, D. R. Glass, AIAA J. 4, 68 (1966).
[CrossRef]

Hanson, R. K.

B. Hiller, R. K. Hanson, Appl. Opt. 27, 33 (1988).
[CrossRef] [PubMed]

J. C. McDaniel, B. Hiller, R. K. Hanson, Opt. Lett. 8, 51 (1983).
[CrossRef] [PubMed]

R. K. Hanson, in 21st Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1986), p. 1677.

Hiller, B.

McDaniel, J. C.

Measures, R. M.

R. M. Measures, J. Appl. Phys. 39, 5232 (1968).
[CrossRef]

Miles, R. B.

S. Cheng, M. Zimmerman, R. B. Miles, Phys. Fluids 26, 874 (1983).
[CrossRef]

Sherman, F. S.

H. Askenas, F. S. Sherman, in Rarefied Gasdynamics, J. H. de Leeuw, ed. (Academic, New York, 1966), Vol. II, p. 84.

Sherman, P. M.

S. Crist, P. M. Sherman, D. R. Glass, AIAA J. 4, 68 (1966).
[CrossRef]

Zimmerman, M.

S. Cheng, M. Zimmerman, R. B. Miles, Phys. Fluids 26, 874 (1983).
[CrossRef]

AIAA J. (1)

S. Crist, P. M. Sherman, D. R. Glass, AIAA J. 4, 68 (1966).
[CrossRef]

Appl. Opt. (1)

J. Appl. Phys. (1)

R. M. Measures, J. Appl. Phys. 39, 5232 (1968).
[CrossRef]

Opt. Lett. (1)

Phys. Fluids (1)

S. Cheng, M. Zimmerman, R. B. Miles, Phys. Fluids 26, 874 (1983).
[CrossRef]

Other (2)

R. K. Hanson, in 21st Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1986), p. 1677.

H. Askenas, F. S. Sherman, in Rarefied Gasdynamics, J. H. de Leeuw, ed. (Academic, New York, 1966), Vol. II, p. 84.

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Figures (4)

Fig. 1
Fig. 1

Schematic diagram showing the imaging geometry and the velocity-induced Doppler-shift effect.

Fig. 2
Fig. 2

Fluorescence image of a Mach 7.2 underexpanded supersonic jet; S+ image, laser incident at θ = 60° to the flow axis, nozzle diameter 1.65 mm, viewed area 2 cm × 1.6 cm.

Fig. 3
Fig. 3

Velocity image showing the velocity component at θ = 60° to the flow axis. The vertical striations are a laser sheet artifact. White corresponds to 780 m/sec, and black corresponds to −110 m/sec.

Fig. 4
Fig. 4

Measured and calculated axial Mach number along the jet center line with 0.2- and 2.0-mJ/pulse excitation.

Equations (2)

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( S + - S - ) / ( S + + S - ) = Δ ν D ( g / g ) ,
Δ ν D ( g / g ) = - ( 1 - 2 S + / S ± ) ,

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