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RESEARCH PRODUCT

A modified moiré technique for three-dimensional surface topography

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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.