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Fast Fourier transform (FFT) methods are very important for the automatic non-contact measurement of deformation in many engineering applications. Although the basic principles are understood, some aspects of their practical application remain to be fully investigated. After a review of the principles of FFT phase measurements of interferograms, the problems of dealing with non-monotonic phase functions are discussed. Applications to holographic and TV-holographic interferograms demonstrate the possibilities and limitations of the numerical techniques applied to practical cases.

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Authors: ZANETTA P, JRC Ispra (IT);ALBRECHT D, Loughborough University of Technology (GB);SPAGNOLO G S, Università di L'Aquila, Roio Poggio (IT);PAOLETTI D, Università di L'Aquila, Roio Poggio (IT)
Bibliographic Reference: Article: Optik International Journal for Light and Electron Optics, Vol. 97 (1994) No. 2, pp. 47-52
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