Abstract

A new full-field technique for mapping lines of constant velocity in a fluid flow is demonstrated. The technique utilizes light scattered from scattering sites within a selected plane of interest of the flow field. The laser-speckle pattern thus formed is used with the established methods of speckle photography and interferometry to determine the velocity field. A double pulsed ruby laser is used to measure the velocity profile in a circular pipe. Turbulent flow fields will place a limitation on the technique; this limit is primarily a function of available equipment.

© 1977 Optical Society of America

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References

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  1. J. A. Leendertz, “Interferometric displacement measurement on scattering surfaces utilizing speckle effect,” J. Phys. E 3, 214–218 (1970).
    [CrossRef]
  2. E. Archbold, J. M. Burch, A. E. Ennos, “Recording of in-plane surface displacement by double exposure speckle photography,” Opt. Acta 17, 883–898 (1970).
    [CrossRef]
  3. E. Archbold, A. E. Ennos, “Displacement measurement from double-exposed laser photographs,” Opt. Acta 19, 253–271 (1972).
    [CrossRef]
  4. D. B. Barker, M. E. Fourney, “Displacement measurements in the interior of 3-D bodies using scattered light speckle patterns,” Exp. Mech. 16:6, 209–214 (1976).
    [CrossRef]
  5. D. B. Barker, M. E. Fourney, “Three-dimensional speckle interferometric investigation of the stress-intensity factor along a crack front” Exp. Mech. 17:7, 241–247 (1977).
    [CrossRef]
  6. M. E. Fourney, J. H. Matkin, A. P. Waggoner, “Aerosol size and velocity determination via holography,” Rev. Sci. Instrum. 40, 205–2131969.
    [CrossRef]
  7. H. Schlichting, Boundary Layer Theory (McGraw-Hill, New York, 1962).

1977 (1)

D. B. Barker, M. E. Fourney, “Three-dimensional speckle interferometric investigation of the stress-intensity factor along a crack front” Exp. Mech. 17:7, 241–247 (1977).
[CrossRef]

1976 (1)

D. B. Barker, M. E. Fourney, “Displacement measurements in the interior of 3-D bodies using scattered light speckle patterns,” Exp. Mech. 16:6, 209–214 (1976).
[CrossRef]

1972 (1)

E. Archbold, A. E. Ennos, “Displacement measurement from double-exposed laser photographs,” Opt. Acta 19, 253–271 (1972).
[CrossRef]

1970 (2)

J. A. Leendertz, “Interferometric displacement measurement on scattering surfaces utilizing speckle effect,” J. Phys. E 3, 214–218 (1970).
[CrossRef]

E. Archbold, J. M. Burch, A. E. Ennos, “Recording of in-plane surface displacement by double exposure speckle photography,” Opt. Acta 17, 883–898 (1970).
[CrossRef]

1969 (1)

M. E. Fourney, J. H. Matkin, A. P. Waggoner, “Aerosol size and velocity determination via holography,” Rev. Sci. Instrum. 40, 205–2131969.
[CrossRef]

Archbold, E.

E. Archbold, A. E. Ennos, “Displacement measurement from double-exposed laser photographs,” Opt. Acta 19, 253–271 (1972).
[CrossRef]

E. Archbold, J. M. Burch, A. E. Ennos, “Recording of in-plane surface displacement by double exposure speckle photography,” Opt. Acta 17, 883–898 (1970).
[CrossRef]

Barker, D. B.

D. B. Barker, M. E. Fourney, “Three-dimensional speckle interferometric investigation of the stress-intensity factor along a crack front” Exp. Mech. 17:7, 241–247 (1977).
[CrossRef]

D. B. Barker, M. E. Fourney, “Displacement measurements in the interior of 3-D bodies using scattered light speckle patterns,” Exp. Mech. 16:6, 209–214 (1976).
[CrossRef]

Burch, J. M.

E. Archbold, J. M. Burch, A. E. Ennos, “Recording of in-plane surface displacement by double exposure speckle photography,” Opt. Acta 17, 883–898 (1970).
[CrossRef]

Ennos, A. E.

E. Archbold, A. E. Ennos, “Displacement measurement from double-exposed laser photographs,” Opt. Acta 19, 253–271 (1972).
[CrossRef]

E. Archbold, J. M. Burch, A. E. Ennos, “Recording of in-plane surface displacement by double exposure speckle photography,” Opt. Acta 17, 883–898 (1970).
[CrossRef]

Fourney, M. E.

D. B. Barker, M. E. Fourney, “Three-dimensional speckle interferometric investigation of the stress-intensity factor along a crack front” Exp. Mech. 17:7, 241–247 (1977).
[CrossRef]

D. B. Barker, M. E. Fourney, “Displacement measurements in the interior of 3-D bodies using scattered light speckle patterns,” Exp. Mech. 16:6, 209–214 (1976).
[CrossRef]

M. E. Fourney, J. H. Matkin, A. P. Waggoner, “Aerosol size and velocity determination via holography,” Rev. Sci. Instrum. 40, 205–2131969.
[CrossRef]

Leendertz, J. A.

J. A. Leendertz, “Interferometric displacement measurement on scattering surfaces utilizing speckle effect,” J. Phys. E 3, 214–218 (1970).
[CrossRef]

Matkin, J. H.

M. E. Fourney, J. H. Matkin, A. P. Waggoner, “Aerosol size and velocity determination via holography,” Rev. Sci. Instrum. 40, 205–2131969.
[CrossRef]

Schlichting, H.

H. Schlichting, Boundary Layer Theory (McGraw-Hill, New York, 1962).

Waggoner, A. P.

M. E. Fourney, J. H. Matkin, A. P. Waggoner, “Aerosol size and velocity determination via holography,” Rev. Sci. Instrum. 40, 205–2131969.
[CrossRef]

Exp. Mech. (2)

D. B. Barker, M. E. Fourney, “Displacement measurements in the interior of 3-D bodies using scattered light speckle patterns,” Exp. Mech. 16:6, 209–214 (1976).
[CrossRef]

D. B. Barker, M. E. Fourney, “Three-dimensional speckle interferometric investigation of the stress-intensity factor along a crack front” Exp. Mech. 17:7, 241–247 (1977).
[CrossRef]

J. Phys. E (1)

J. A. Leendertz, “Interferometric displacement measurement on scattering surfaces utilizing speckle effect,” J. Phys. E 3, 214–218 (1970).
[CrossRef]

Opt. Acta (2)

E. Archbold, J. M. Burch, A. E. Ennos, “Recording of in-plane surface displacement by double exposure speckle photography,” Opt. Acta 17, 883–898 (1970).
[CrossRef]

E. Archbold, A. E. Ennos, “Displacement measurement from double-exposed laser photographs,” Opt. Acta 19, 253–271 (1972).
[CrossRef]

Rev. Sci. Instrum. (1)

M. E. Fourney, J. H. Matkin, A. P. Waggoner, “Aerosol size and velocity determination via holography,” Rev. Sci. Instrum. 40, 205–2131969.
[CrossRef]

Other (1)

H. Schlichting, Boundary Layer Theory (McGraw-Hill, New York, 1962).

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Figures (3)

Fig. 1
Fig. 1

Schematic diagram of experimental arrangement.

Fig. 2
Fig. 2

Young’s fringe pattern for various fluid velocities.

Fig. 3
Fig. 3

Velocity distribution across diameter of circular pipe.

Tables (1)

Tables Icon

Table 1 Comparison of Optically Measured Maximum Velocity with Average Velocities (mm/sec)

Equations (3)

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α = arc sin ( λ / υ m t ) ,
s = 1 . 2 λ f ( m + 1 m ) .
υ x = λ / 2 n t ,

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