Synchronous detection technique for temporal fringe pattern analysis

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An alternative method for temporal evaluation of fringe patterns is proposed. The method is based on the application of a synchronous detection system for processing the temporal irradiance fluctuations generated when the sensitivity of the optical set-up is changed. The technique requires an easy computing implementation and presents good noise rejection characteristics, In particular, the proposed method does not require to store the whole set of fringe images as it happens with Fourier techniques which allows for a faster data processing. Results of this method proved on synthetic fringe images as well as in real experiments are presented.
© 2002 Elsevier Science B.V. We acknowledge the support of the Consejo Nacional de Ciencia y Tecnología (México) and the Centro de Ingeniería y Desarrollo Industrial (Querétaro, México) for the postdoctoral grant of J. Villa. We also wish to thank the economical support of the European Union, project INDUCE, BRPR-CT97-0805 and Universidad Complutense de Madrid, project PR48/01-9858.
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