Abstract

A technique for fast measurements of the distance to an object’s surface based on spatial filtering of dynamic speckle patterns is proposed. Exploitation of two spatial filters (Ronchi rulings) enables measurements to be independent of surface speed. Experimental verification of the technique is demonstrated at speeds of the surface as high as 50 m/s. The technique may find applications in machine-vision systems for acquisition of three-dimensional images and in control systems for on-line monitoring of fast-moving parts of industrial machines.

© 2005 Optical Society of America

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References

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  1. I. Yamaguchi and S. Komatsu, Opt. Acta 24, 705 (1977).
    [CrossRef]
  2. M. Giglio, S. Musazzi, and U. Perini, Appl. Opt. 20, 721 (1981).
    [CrossRef] [PubMed]
  3. A. Hayashi and Y. Kitagawa, Opt. Commun. 49, 91 (1985).
    [CrossRef]
  4. T. Yoshimura, J. Opt. Soc. Am. A 3, 1032 (1986).
    [CrossRef]

1986 (1)

1985 (1)

A. Hayashi and Y. Kitagawa, Opt. Commun. 49, 91 (1985).
[CrossRef]

1981 (1)

1977 (1)

I. Yamaguchi and S. Komatsu, Opt. Acta 24, 705 (1977).
[CrossRef]

Giglio, M.

Hayashi, A.

A. Hayashi and Y. Kitagawa, Opt. Commun. 49, 91 (1985).
[CrossRef]

Kitagawa, Y.

A. Hayashi and Y. Kitagawa, Opt. Commun. 49, 91 (1985).
[CrossRef]

Komatsu, S.

I. Yamaguchi and S. Komatsu, Opt. Acta 24, 705 (1977).
[CrossRef]

Musazzi, S.

Perini, U.

Yamaguchi, I.

I. Yamaguchi and S. Komatsu, Opt. Acta 24, 705 (1977).
[CrossRef]

Yoshimura, T.

Appl. Opt. (1)

J. Opt. Soc. Am. A (1)

Opt. Acta (1)

I. Yamaguchi and S. Komatsu, Opt. Acta 24, 705 (1977).
[CrossRef]

Opt. Commun. (1)

A. Hayashi and Y. Kitagawa, Opt. Commun. 49, 91 (1985).
[CrossRef]

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Figures (2)

Fig. 1
Fig. 1

Setup for distance measurements by spatial filtering of dynamic speckles. Insets, typical oscilloscope traces of electrical current recorded from both photodiodes simultaneously.

Fig. 2
Fig. 2

Distance z as a function of surface velocity VOB calculated from Eq. (2). Modulation frequencies fSP1 and fSP2 of the spatially filtered speckle patterns were measured by fast Fourier transfer of photodiode signals.

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

VSPVOB1+D0RWVOB1+D+z cos θz+ZR2/z,
fSP1=VOBΛ11+D1+z cos θ1z+ZR2/z,fSP2=VOBΛ21+D2+z cos θ2z+ZR2/z.
z+ZR2/z=D2Λ1fSP1-D1Λ2fSP2fSP1Λ11+cos θ2-fSP2Λ21+cos θ1.
z=2z+D12z+D22zD1-D2f,

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