1 December 1990 Improved Fourier transform profilometry for the automatic measurement of three-dimensional object shapes
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Optical Engineering, 29(12), (1990). doi:10.1117/12.55746
Abstract
By using a defocused optical field with a Ronchi grating to get a quasi-sine optical field and by using a grating ? phase shifting technique, the fundamental spectrum modulated by the object height distribution can theoretically be extended from 0 to 2f0 ( f0 is the carrier frequency of the optical field) without overlapping the zero component and other higher spectra. Consequently, the measurable slope of height variation can be extended to nearly three times that of the unimproved Fourier transform profilometry method. This paper gives the theory and experiment results of the improved Fourier transform profilometry. Subject terms: pro filometry; machine vision; contouring.
Jian Li, Xianyu Su, Lurong Guo, "Improved Fourier transform profilometry for the automatic measurement of three-dimensional object shapes," Optical Engineering 29(12), (1 December 1990). http://dx.doi.org/10.1117/12.55746
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KEYWORDS
Fourier transforms

3D metrology

Modulation

Phase shifting

Spatial frequencies

Ronchi rulings

Projection systems

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