Fruit profilometry based on shadow Moiré techniques

摘要

The Moiré Techniques (MT) are a group of techniques based on the moiré phenomenon, which are commonly used in profilometry, due to your simplicity and measurement speed. The moiré phenomenon consists of the interference caused by the overlapping of two periodic structures or grids. Shadow TM with multiplication of fringes is more sensitive than the traditional method and besides, they reduce the effects of the illumination difference in the surface of the object in study. The objective of this work was to generate a digital model of the surface of the pear for shadow TM with multiplication of fringes and to compare with another model generated starting from scanner 3D. For this, a model of a pear, in scale 1:1, made in paraffin and an experimental set up outline with moiré grid, light and digital photographic camera were used. The results showed a high correlation among the results from the two methods. Shadow TM with multiplication of fringes gave a satisfactory determination of topography of the pear.