Improved regularised phase-tracking technique for the processing of squared-grating deflectograms

We propose a robust procedure based on the regularized phase-tracking (RPT) technique to demodulate squared-grating deflectograms. The use of squared gratings, already reported, lets us multiplex the information of the deflections in two orthogonal directions in a single image, thus avoiding the nec...

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Bibliographic Details
Authors: Quiroga Mellado, Juan Antonio, Villa Hernández, José de Jesús, Servín Guirado, Manuel
Format: article
Publication Date:2000
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/58791
Online Access:https://hdl.handle.net/20.500.14352/58791
Access Level:Open access
Keyword:535
Moire Deflectometry
Fourier-Transform
Fringe-Pattern
Interferometer
Demodulation
Diffraction
Image
Óptica (Física)
2209.19 Óptica Física
Description
Summary:We propose a robust procedure based on the regularized phase-tracking (RPT) technique to demodulate squared-grating deflectograms. The use of squared gratings, already reported, lets us multiplex the information of the deflections in two orthogonal directions in a single image, thus avoiding the necessity of rotating the gratings. The good noise-rejection characteristics of the RPT technique are improved by use of a quasi-Newton optimization algorithm and a quality-map-based algorithm for the crystal-growing process.

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