A windowing technique for the automated analysis of holo-interferograms

A systematic method for measuring surface deformations is described which includes the use of real-time holographic interferometry, the incorporation of a carrier fringe pattern to achieve fringe linearization, and the application of image digitization and automated computer analysis for rapid quant...

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Veröffentlicht in:Optics and lasers in engineering 1988, Vol.8 (2), p.123-136
Hauptverfasser: Matthys, D.R., Gilbert, J.A., Dudderar, T.D., Koenig, K.W.
Format: Artikel
Sprache:eng
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Zusammenfassung:A systematic method for measuring surface deformations is described which includes the use of real-time holographic interferometry, the incorporation of a carrier fringe pattern to achieve fringe linearization, and the application of image digitization and automated computer analysis for rapid quantitative interpretation. In this method, regions of interest can be selected by the use of a windowing technique in which the operator specifies the desired subregion. The problem of correctly numbering fringes which originate or vanish at the boundary where the scanning begins is solved by an algorithm which ensures correct identification of the fringe orders. The output includes a perspective plot of the out-of-plane deformation field. This method is demonstrated by its application to a measurement of the out-of-plane deformation of a hermetically sealed plastic housing loaded by internal pressurization.
ISSN:0143-8166
1873-0302
DOI:10.1016/0143-8166(88)90048-6