Interferogram Analysis Using Image Processing Techniques

Vrooman, Henri A.; Maas, Ad A. M.

doi:10.1117/12.961340

Cited by 4 publications

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“…Fig. An important conclusion of these investigations is that the systematic phase error caused by variation of /1(x, y) and /0(x, y) oscillates from zero in the middle between bright and dark fringes to its extreme values at the fringe centerlines for every fringe, and this error is Several algorithms have been developed to normalize fringe patterns (8), (40), (48)(49)(50)(51) Assuming a multiplicative superposition of the background with the fringe modulation term, the shading correction with background division is the simplest way: Fig.…”

Section: W Ostenmentioning

confidence: 99%

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Optical Methods in Experimental Solid Mechanics

Laermann¹

2000

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This volume contains 266 illustrationsThis work is subject to copyright.All rights are reserved, whether the whole or part of the material is concerned specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction hy photocopying machine or similar means. and storage in data hanks. PREFACE Recent developments and achievements inmeasurement techniques especially in optical and electro-optical methods like holography, shearography, speckle interferometry, grid-methods, modern modification of photoelasticity and photoviscoelasticity have opened new fields of applying experimental analysis in solid mechanics, in research as well as in industrial practice. Combined with computer techniques in digital image processing, data recording and data evaluation complex measuring systems can be realised nowadays with the possibility of far-reaching automation of the entire analysing processes. The sensitivity and the high resolving power of recording equipment requires thorough investigation of any effects on the precision and reliability of the measurements. Therefore it is necessary, to deal with the physics and the theories of the measurement methods in order to interpret the observed phenomena correctly. Furthermore proper algorithms must be available to evaluate the measured data to get the finally wanted infonnation, which generally do not coincide with the quantities taken from the measurements originally. This fact requires complementary scientific considerations of the theories concerning the problems to be analysed. At least the combination of experimental and mathematical/numerical procedures for evaluation and interpretation, known as "hybrid technique", demands additional contemplation. The lectures cover i. the theory and the physics of advanced optical measuring methods and problems of experimental performance, recent achievements in 2and ]-dimensional linear/non-linear photoelasticity including photovisco-elasticity, Moire-and grid-techniques, illfe1jerometric methods (holography. speckle inte1.ferometry, shearography): 11.the theory (~f digital image processing and its pe1jomwnce. data-recording, -compression, -processing, -l'isuali:::ation:iii. mathematical and numerical procedures. il{formatics for emluation of measured, digiti:;,ed data.As the co-ordinator (~f the CISM-course "Modem Optical Methods in Experimellfal Solid Mechanics .. and the editor (~f the lecture notes I grate.fitlly thank the lecturers/autlwrsfor the e.fjectil'e co-operation and thorough re\·ising the manuscripts. the resident Rector. the General Secretary. the ChiefEditor.and explicitly the st(!ffmemhers (~f CISM Secretariat.f(Jr support and excellent organisation (~f the course. Many thanks to the Springer-Verlag .f(Jr publishing the lecture notes. Karl-Hans LaennannABSTRACT Optical methods in experimental solid mechanics, yielding field information, combined with digital image processing and on-line evaluation of the experimentally obtained data by means of numerical procedures enable the stress-stra...

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Section: W Ostenmentioning

confidence: 99%

“…Under the same assumptions as before the method of homomorphic filtering also delivers good results. In (50), (51) steplike envelopes lmax and /min are constructed by connecting the local maxima and minima, respectively, of the frinqe pattern. the inverted Gaussian low-pass.…”

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confidence: 99%