Abstract

A novel method of rapid three-dimensional optical metrology that is based on triangulation of a configration of color-coded light stripes is presented. The method exploits polychromatic illumination and a combined diffractive–refractive element, so the incident light is focused upon a stripe that is axially dispersed, greatly increasing the depth-measuring range without any decrease in the axial or the lateral resolution. The discrimination of each color stripe is further improved by spectral coding and decoding techniques. An 18-fold increase in the depth of focus was experimentally obtained while diffraction-limited light stripes were completely maintained.

© 1999 Optical Society of America

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References

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  8. We calculated the intensity of each wavelength by multiplying a Fresnel diffraction integral by the VWF response and taking into account the dispersion relation of the ADO.?The total intensity was obtained by integration of those intensities over the entire spectrum of the source.

1996

1994

1991

1988

P. Seitz, Opt. Eng. 27, 535 (1988).
[CrossRef]

1985

G. Bickel, G. Häusler, and M. Maul, Opt. Eng. 24, 975 (1985).
[CrossRef]

Bickel, G.

G. Bickel, G. Häusler, and M. Maul, Opt. Eng. 24, 975 (1985).
[CrossRef]

Davidson, N.

Dong, B. Z.

Dorsch, R. G.

Friesem, A. A.

Gu, B. Y.

Hasman, E.

Häusler, G.

Herrmann, J. M.

Knapp, K. N.

D. W. Manthey, K. N. Knapp, and D. Lee, Opt. Eng. 33, 3372 (1994).
[CrossRef]

Lee, D.

D. W. Manthey, K. N. Knapp, and D. Lee, Opt. Eng. 33, 3372 (1994).
[CrossRef]

Manthey, D. W.

D. W. Manthey, K. N. Knapp, and D. Lee, Opt. Eng. 33, 3372 (1994).
[CrossRef]

Maul, M.

G. Bickel, G. Häusler, and M. Maul, Opt. Eng. 24, 975 (1985).
[CrossRef]

Seitz, P.

P. Seitz, Opt. Eng. 27, 535 (1988).
[CrossRef]

Yang, G. Z.

Appl. Opt.

J. Opt. Soc. Am. A

Opt. Eng.

G. Bickel, G. Häusler, and M. Maul, Opt. Eng. 24, 975 (1985).
[CrossRef]

D. W. Manthey, K. N. Knapp, and D. Lee, Opt. Eng. 33, 3372 (1994).
[CrossRef]

P. Seitz, Opt. Eng. 27, 535 (1988).
[CrossRef]

Opt. Lett.

Other

We calculated the intensity of each wavelength by multiplying a Fresnel diffraction integral by the VWF response and taking into account the dispersion relation of the ADO.?The total intensity was obtained by integration of those intensities over the entire spectrum of the source.

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Figures (4)

Fig. 1
Fig. 1

Color-coded light-stripe triangulation system.

Fig. 2
Fig. 2

Measured + and calculated (dashed line) dispersion of the ADO, combined diffractive–refractive lens, and the wavelength transmittance band and the dispersion of the linear variable wavelength filter (solid lines).

Fig. 3
Fig. 3

Measured (a) and calculated (b) intensity cross sections at three positions along the focal range: dashed curve, z=299 mm; solid curve, z=323 mm; dashed–dotted curve, z=347 mm.

Fig. 4
Fig. 4

Measured profile of a seashell.

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