A modified moiré technique for three-dimensional surface topography

In this paper we present an optical technique based on the shadow moire method which allows the measurement and digitization of three-dimensional surfaces. The technique was tested through experimental work and the results were compared with those obtained by a coordinate measuring machine. Moving from the conventional shadow moire method, new features were implemented enabling us to overcome the main shortcomings of the conventional moire method. These include the need to assign the fringe order, the incapability of discerning concavity or convexity, the poor resolution and the complexity in the signal processing. All these problems have been solved by adding an element to generate a carrier fringe pattern to the equipment of the conventional shadow moire technique and processing the obtained signal using the Fourier transform method. The proposed technique was applied to obtain external surfaces of sheet metal stamped parts. The experimental results show the effectiveness of this technique.

[1]  Toru Yoshizawa,et al.  Shadow moireprofilometry using the phase-shifting method , 2000 .

[2]  R. Czarnek,et al.  Surface contouring using virtual gratings , 1991 .

[3]  Thomas Kreis,et al.  Digital holographic interference-phase measurement using the Fourier-transform method , 1986 .

[4]  Takumi Minemoto,et al.  Sensitivity‐variable moire´ topography with a phase shift method , 1996 .

[5]  Mumin Song,et al.  Overview of three-dimensional shape measurement using optical methods , 2000 .

[6]  J. G. Walker,et al.  Investigation of the Fourier-transform method of fringe pattern analysis , 1988 .

[7]  Kiyoshi Takamasu,et al.  3-D shape measurement by self-referenced pattern projection method , 1999 .

[8]  H E Cline,et al.  Automatic moire contouring. , 1984, Applied optics.

[9]  M. Takeda,et al.  Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry , 1982 .

[10]  C. Heipke.  A global approach for least-squares image matching and surface reconstruction in object space , 1992 .

[11]  Akira Kobayashi.  New optical measurements and their applications in industry , 1991 .

[12]  A. Lagarde,et al.  Three-dimensional shape reconstruction by phase-shifting shadow moire. , 1994, Applied optics.

[13]  Boxiong Wang,et al.  Moire deflectometry based on Fourier-transform analysis , 1999 .

[14]  Bongtae Han,et al.  High sensitivity moiré , 1994 .

[15]  W. P. T. North,et al.  Phase shifting method for retroreflective grating analysis , 1998 .

[16]  Maurice Halioua,et al.  Projection moire with moving gratings for automated 3-D topography. , 1983, Applied optics.

[17]  M. Takeda,et al.  Fourier transform profilometry for the automatic measurement of 3-D object shapes. , 1983, Applied optics.

[18]  Toru Yoshizawa,et al.  Shadow moire´ profilometry by frequency sweeping , 2001 .

[19]  David R. Burton,et al.  Four-map absolute distance contouring , 1997 .

[20]  Ming Wang.  Projection moire deflectometry for the automatic measurement of phase objects , 1996 .

[21]  Toru Yoshizawa,et al.  Shadow moiré topography by means of the phase-shift method , 1993 .

[22]  C. A. Sciammarella,et al.  Digital-filtering techniques applied to the interpolation of Moiré-fringes data , 1967 .