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Emanuele Zappa, Giorgio Busca
Optics and Lasers in Engineering, Volume 50, Issue 8, August 2012
Abstract
Fringe projection techniques are very popular among the several profilometry methods proposed in literature. One of their main advantages is that most of them require one image of the object to retrieve its surface. From a theoretical point of view these techniques are based on a simple mathematical model which is at the base of the conversion of the measured quantity (usually the phase map of the image of the grid projected onto an object surface) into the height distribution of the object. However, the practical implementation of the system is not an easy task to be achieved. The mathematical models are often a simplification of the reality and it is valid only under some conditions. These discrepancies between the theory and the practice deal to a series of discussions about the quality of the measure of fringe projection techniques. This paper proposes a wide argumentation about the measurement uncertainty and the source of error which is influenced by. After a concise description of the triangulation model and of the basic idea of the system working, the measurement techniques are analyzed both from a static and a dynamic point of view, with a special attention to the uncertainty sources in the two measurement conditions and the possible improvements that may be applied to reduce their influence.
Additional information:
This review paper deals with the issue of static and dynamic feature of scanning devices based on Fourier Transform Profilometry (FTP). The authors were invited by the Editor of the international journal “Optics and Lasers in Engineering” to submit a paper for the special issue on Fringe Analysis Methods & Applications and proposed this contribute because the static and dynamic characterisation of FTP scanners is a fundamental issue that shown a rapid growing in recent years and a systematic review can be of help for the scientific community.
Previous researches of the authors in this field include:
– Giorgio Busca, Emanuele Zappa, Sensitivity analysis applied to an improved Fourier-transform profilometry, Optics and Lasers in Engineering 49 (2011) pp. 210–221.
– E. Zappa, G. Busca, P.Sala, Innovative calibration technique for fringe projection based 3D scanner, Optics and Lasers in Engineering 49 (2011), pp. 331–340
– Emanuele Zappa,Giorgio Busca, Fourier-transform profilometry calibration based on an exhaustive geometric model of the system, Optics and Lasers in Engineering 47 (2009) 754–767
– Emanuele Zappa, Giorgio Busca, Comparison of eight unwrapping algorithms applied to Fourier-transform profilometry, Optics and Lasers in Engineering, ISSN: 0143-8166, Volume: 46, Issue: 2, February 2008, pp.106–116
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