Abstract

Nonintrusive, off-body flow barometry in Mach 2 airflow has been demonstrated in a large-scale supersonic wind tunnel using seedless laser-induced thermal acoustics (LITA). The static pressure of the gas flow is determined with a novel differential absorption measurement of the ultrasonic sound produced by the LITA pump process. Simultaneously, the streamwise velocity and static gas temperature of the same spatially resolved sample volume were measured with this nonresonant time-averaged LITA technique. Mach number, temperature, and pressure have 0.2%, 0.4%, and 4% rms agreement, respectively, in comparison with known free-stream conditions.

© 2007 Optical Society of America

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2004

R. Stevens and P. Ewart, Appl. Phys. B 78, 111 (2004).
[CrossRef]

2002

2000

1999

M. S. Brown and W. L. Roberts, J. Propul. Power 15, 119 (1999).
[CrossRef]

P. Barker, J. H. Grinstead, and R. B. Miles, Opt. Commun. 168, 177 (1999).
[CrossRef]

1998

1993

D. E. Govoni, J. A. Booze, A. Sinha, and F. F. Crim, Chem. Phys. Lett. 216, 525 (1993).
[CrossRef]

Balla, R. J.

Barker, P.

P. Barker, J. H. Grinstead, and R. B. Miles, Opt. Commun. 168, 177 (1999).
[CrossRef]

Bass, H. E.

H. E. Bass, L. C. Sutherland, J. Piercy, and L. Evans, in Physical Acoustics, W.Mason and R.N.Thurston, eds. (Academic, 1984), Vol. 17, p. 157.

Booze, J. A.

D. E. Govoni, J. A. Booze, A. Sinha, and F. F. Crim, Chem. Phys. Lett. 216, 525 (1993).
[CrossRef]

Brown, M. S.

M. S. Brown and W. L. Roberts, J. Propul. Power 15, 119 (1999).
[CrossRef]

Corlett, W. A.

C. M. Jackson, Jr., W. A. Corlett, and W. J. Monta, 'Description and calibration of the Langley Unitary Plan Wind Tunnel,' NASA TP-1905 (NASA, November 1981).

Crim, F. F.

D. E. Govoni, J. A. Booze, A. Sinha, and F. F. Crim, Chem. Phys. Lett. 216, 525 (1993).
[CrossRef]

Cummings, E. B.

Evans, L.

H. E. Bass, L. C. Sutherland, J. Piercy, and L. Evans, in Physical Acoustics, W.Mason and R.N.Thurston, eds. (Academic, 1984), Vol. 17, p. 157.

Ewart, P.

Govoni, D. E.

D. E. Govoni, J. A. Booze, A. Sinha, and F. F. Crim, Chem. Phys. Lett. 216, 525 (1993).
[CrossRef]

Grinstead, J. H.

P. Barker, J. H. Grinstead, and R. B. Miles, Opt. Commun. 168, 177 (1999).
[CrossRef]

Hart, R. C.

Hemmerling, B.

Herring, G. C.

Jackson, C. M.

C. M. Jackson, Jr., W. A. Corlett, and W. J. Monta, 'Description and calibration of the Langley Unitary Plan Wind Tunnel,' NASA TP-1905 (NASA, November 1981).

Kozlov, D. N.

Miles, R. B.

P. Barker, J. H. Grinstead, and R. B. Miles, Opt. Commun. 168, 177 (1999).
[CrossRef]

Monta, W. J.

C. M. Jackson, Jr., W. A. Corlett, and W. J. Monta, 'Description and calibration of the Langley Unitary Plan Wind Tunnel,' NASA TP-1905 (NASA, November 1981).

Piercy, J.

H. E. Bass, L. C. Sutherland, J. Piercy, and L. Evans, in Physical Acoustics, W.Mason and R.N.Thurston, eds. (Academic, 1984), Vol. 17, p. 157.

Roberts, W. L.

M. S. Brown and W. L. Roberts, J. Propul. Power 15, 119 (1999).
[CrossRef]

Schlamp, S.

Sinha, A.

D. E. Govoni, J. A. Booze, A. Sinha, and F. F. Crim, Chem. Phys. Lett. 216, 525 (1993).
[CrossRef]

Sobota, T. H.

Stampanoni-Panariello, A.

Stevens, R.

R. Stevens and P. Ewart, Appl. Phys. B 78, 111 (2004).
[CrossRef]

Sutherland, L. C.

H. E. Bass, L. C. Sutherland, J. Piercy, and L. Evans, in Physical Acoustics, W.Mason and R.N.Thurston, eds. (Academic, 1984), Vol. 17, p. 157.

Walker, D. J. W.

Williams, R. B.

Appl. Opt.

Appl. Phys. B

R. Stevens and P. Ewart, Appl. Phys. B 78, 111 (2004).
[CrossRef]

Chem. Phys. Lett.

D. E. Govoni, J. A. Booze, A. Sinha, and F. F. Crim, Chem. Phys. Lett. 216, 525 (1993).
[CrossRef]

J. Propul. Power

M. S. Brown and W. L. Roberts, J. Propul. Power 15, 119 (1999).
[CrossRef]

Opt. Commun.

P. Barker, J. H. Grinstead, and R. B. Miles, Opt. Commun. 168, 177 (1999).
[CrossRef]

Opt. Lett.

Other

H. E. Bass, L. C. Sutherland, J. Piercy, and L. Evans, in Physical Acoustics, W.Mason and R.N.Thurston, eds. (Academic, 1984), Vol. 17, p. 157.

C. M. Jackson, Jr., W. A. Corlett, and W. J. Monta, 'Description and calibration of the Langley Unitary Plan Wind Tunnel,' NASA TP-1905 (NASA, November 1981).

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Figures (2)

Fig. 1
Fig. 1

Schematic of beam geometry near focal region of laser beams. (a) Two acoustic wave packets (vertical bold) are overlapped just after they are created at time t o by the crossed pump beams (fine solid line). The probe and detector are omitted for clarity. (b) The slower packet at Mach M 1 is shown passing through the probe beam (dashed line) and scattering signal A at time t , after the faster packet at Mach M + 1 has already scattered signal A + (dashed arrow) toward the detector at the Bragg scattering angle, at earlier time t + .

Fig. 2
Fig. 2

Comparison of time-averaged LITA measurements ( 17 s ) and known UPWT flow parameters for (a) Mach number, (b) temperature, and (c) pressure.

Equations (3)

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A A + = exp [ α V s ( t t + ) ] .
α Δ ω 2 T 0.5 P Δ k 2 T 1.5 P ,
P x o T 1.5 { ( M 2 1 ) ln [ ( f + A + f A ) 0.5 ] } ,

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