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Titolo:
Fast phase-map recovery from large shears in an electronic speckle-shearing pattern interferometer using a Fourier least-squares estimation
Autore:
Davila, A; Servin, M; Facchini, M;
Indirizzi:
Ctr Invest Opt, Leon 37150, Gto, Mexico Ctr Invest Opt Leon Gto Mexico 37150 Invest Opt, Leon 37150, Gto, Mexico Ecole Polytech Fed Lausanne, Inst Mesure & Anal Contraintes, IMAC GC Ecublens, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne Lausanne Switzerland CH-1015 ne, Switzerland
Titolo Testata:
OPTICAL ENGINEERING
fascicolo: 9, volume: 39, anno: 2000,
pagine: 2487 - 2494
SICI:
0091-3286(200009)39:9<2487:FPRFLS>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERFEROGRAMS; RECONSTRUCTION; SHEAROGRAPHY;
Keywords:
shearing; speckle; interferometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Davila, A Ctr Invest Opt, Loma Bosque 115,Col Lomas Campestre, Leon 37150,Gto, Mexico Ctr Invest Opt Loma Bosque 115,Col Lomas Campestre Leon Gto Mexico 37150
Citazione:
A. Davila et al., "Fast phase-map recovery from large shears in an electronic speckle-shearing pattern interferometer using a Fourier least-squares estimation", OPT ENG, 39(9), 2000, pp. 2487-2494

Abstract

Electronic speckle-shearing pattern interferometry offers the possibility of analyzing out-of-plane and in-plane deformations in experimental mechanics. However, to obtain high-contrast fringes this technique must introduce large shears into the speckle patterns. Several techniques have recently been proposed to recover the phase from these data, but they all suffer limitations due to the slow convergence of the proposed algorithms or to the lowprecision of the recovered phase. This paper presents a least-squares estimation method in the frequency domain that allows wavefront recovery from two orthogonal shearing fringe patterns when a large shear is applied. This method is based on the application of a single Fourier filter using the fast Fourier transform process. The experimental results obtained by using electronic speckle-shearing pattern interferometry for the analysis of a finite circular plate deformed at the center illustrate the advantages of the proposed technique. (C) 2000 society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)00309-3].

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Documento generato il 03/04/20 alle ore 04:21:56