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Author: T. D. DUDDERAR
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
HOLOGRAPHIC INTERFEROMETRY IS A NEW OPTICL METHOD FOR MEASURING DISPLACEMENT AND DEFORMATION FIELDS WHICH EXPLOITS UNIQUE PROPERTIES OF HOLOGRAPHY. SPECIFICALLY, HOLOGRAPHY PERMITS STORAGE OF A LIGHT WAVE FRONT AND ITS SUBSEQUENT RECONSTRUCTION AT ANY DESIRED TIME. AS SUCH, IT PROVIDES AN OPTICAL REPLICA OF A TEST PIECE IN A GIVEN STATE WHICH OPTICALLY INTERFERES WITH SUBSEQUENT IMAGES OF THE TEST PIECE. UNDER APPROPRIATE CONDITIONS, THE RESULTING INTERFERENCE PATTERN CAN THEN BE RELATED TO CHANGES IN POSITION AND DEFORMATION OF THE TEST PIECE. THE TECHNIQUE MAY BE ADAPTED TO THE USE OF EITHER TRANSPARENT OR OPAQUE TEST PIECES, AND WITH FAR GREATER FLEXIBILITY AND RANGE OF MEASUREMENT THAN CONVENTIONAL INTERFEROMETRY WHERE ALL SURFACES MUST BE OPTICALLY FLAT. BOTH REAL TIME AND STORED STATIC AND DYNAMIC TECHNIQUES HAVE NOW BEEN DEVELOPED AND ARE CONTINUOUSLY BEING REFINED. PROMISING AREAS FOR APPLICATION ARE IN ASSOCIATION WITH AND AS A COMPLEMENT TO PHOTO-ELASTICITY FOR STATIC AND DYNAMIC MODEL ANALYSIS, AND IN SUCH MATERIALS STUDIES AS FLAW GROWTH OR DAMAGE DETECTION IN FATIGUE AND FRACTURE MECHANICS.
Author: T. D. DUDDERAR
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
HOLOGRAPHIC INTERFEROMETRY IS A NEW OPTICL METHOD FOR MEASURING DISPLACEMENT AND DEFORMATION FIELDS WHICH EXPLOITS UNIQUE PROPERTIES OF HOLOGRAPHY. SPECIFICALLY, HOLOGRAPHY PERMITS STORAGE OF A LIGHT WAVE FRONT AND ITS SUBSEQUENT RECONSTRUCTION AT ANY DESIRED TIME. AS SUCH, IT PROVIDES AN OPTICAL REPLICA OF A TEST PIECE IN A GIVEN STATE WHICH OPTICALLY INTERFERES WITH SUBSEQUENT IMAGES OF THE TEST PIECE. UNDER APPROPRIATE CONDITIONS, THE RESULTING INTERFERENCE PATTERN CAN THEN BE RELATED TO CHANGES IN POSITION AND DEFORMATION OF THE TEST PIECE. THE TECHNIQUE MAY BE ADAPTED TO THE USE OF EITHER TRANSPARENT OR OPAQUE TEST PIECES, AND WITH FAR GREATER FLEXIBILITY AND RANGE OF MEASUREMENT THAN CONVENTIONAL INTERFEROMETRY WHERE ALL SURFACES MUST BE OPTICALLY FLAT. BOTH REAL TIME AND STORED STATIC AND DYNAMIC TECHNIQUES HAVE NOW BEEN DEVELOPED AND ARE CONTINUOUSLY BEING REFINED. PROMISING AREAS FOR APPLICATION ARE IN ASSOCIATION WITH AND AS A COMPLEMENT TO PHOTO-ELASTICITY FOR STATIC AND DYNAMIC MODEL ANALYSIS, AND IN SUCH MATERIALS STUDIES AS FLAW GROWTH OR DAMAGE DETECTION IN FATIGUE AND FRACTURE MECHANICS.
Author: Yuri I. Ostrovsky
Publisher: Springer
ISBN: 3540470689
Category : Science
Languages : en
Pages : 257
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Book Description
This monograph deals with diverse applications of holographic interferome try in experimental solid mechanics. Holographic interferometry has experienced a development of twenty years. It has enjoyed success and suffered some disappointments mainly due to early overestimation of its potential. At present, development of holo graphic interferometry is progressing primarily as a technique for quantita tive measurements. This is what motivated us to write this book - to ana lyze the quantitative methods of holographic interferometry. The fringe patterns obtained in holographic interferometry are graphi cally descriptive. In the general case, however, because they contain infor mation on the total vectors of displacement for points on the surface of a stressed body, the interpretation of these interferograms is much more complicated than in typical conventional interferometry. In addition, the high sensitivity of the method imposes new requirements on the loading of the objects under study. New approaches to designing loading fixtures are needed in many cases to ensure the desired loading conditions. The wealth of information obtained in holographic interferometry necessitates the use of modern computational mathematics. Therefore, practical implementation of the various methods of holographic interferometry must overcome sub stantial difficulties requiring adequate knowledge in diverse areas of science such as coherent optics, laser technology, mechanics, and applied mathe matics. Experimental methods play a significant role in solid mechanics.
Author: Igor A. Razumovsky
Publisher: Springer Science & Business Media
ISBN: 3642112226
Category : Science
Languages : en
Pages : 187
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Book Description
This reference tutorial contains modern experimental approaches to analysis of strain-stress distribution based on interference-optical methods of registration of strain or displacement fields, including coherent-optical techniques (holographic interferometry, speckle photography, electronic digital speckle interferometry techniques) and photoelastic methods as well as the shadow optical method of caustic. The book describes the theory, efficient scope of application in the every-day practice and the problems of further development of these techniques. Much attention is paid to new and promising advanced developments in the field of observation and computational methods for study of residual stress, determination of fracture mechanics parameters and material deformation characteristics. The content corresponds to the course of lectures delivered by the author at the N.E. Bauman Moscow State Technical University. It is intended for technical university students, research engineers and postgraduate students who are doing analysis of strain-stress state and strength of structural elements.
Author: Pramod K. Rastogi
Publisher: Springer
ISBN: 3540480781
Category : Science
Languages : en
Pages : 343
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Book Description
Holographic Interferometry provides a valuable and up-to-date source of information in the rapidly expanding field. The eight specialists` contributions cover the principles and methods currently in use. The scope of the book has been limited to the study of opaque object and ample space has been devoted to a comprehensive treatment of the phenomena of fringe formation, with a particular emphasis on the quantitative evaluation of the holographic interference fringe patterns. The emergence of computer-aided fringe analysis and phase-shifting techniques have simplified considerably the quantative real-time measurements of object shapes and deformations. The last two chapters provide a reasonably detailedoverview of full-field holographic methods for the measurement of shapes, displacements, dervatives, difference displacements and vibrations.
Author: Yuri I. Ostrovsky
Publisher: Springer
ISBN: 9783540526049
Category : Technology & Engineering
Languages : en
Pages : 251
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Book Description
This monograph deals with diverse applications of holographic interferome try in experimental solid mechanics. Holographic interferometry has experienced a development of twenty years. It has enjoyed success and suffered some disappointments mainly due to early overestimation of its potential. At present, development of holo graphic interferometry is progressing primarily as a technique for quantita tive measurements. This is what motivated us to write this book - to ana lyze the quantitative methods of holographic interferometry. The fringe patterns obtained in holographic interferometry are graphi cally descriptive. In the general case, however, because they contain infor mation on the total vectors of displacement for points on the surface of a stressed body, the interpretation of these interferograms is much more complicated than in typical conventional interferometry. In addition, the high sensitivity of the method imposes new requirements on the loading of the objects under study. New approaches to designing loading fixtures are needed in many cases to ensure the desired loading conditions. The wealth of information obtained in holographic interferometry necessitates the use of modern computational mathematics. Therefore, practical implementation of the various methods of holographic interferometry must overcome sub stantial difficulties requiring adequate knowledge in diverse areas of science such as coherent optics, laser technology, mechanics, and applied mathe matics. Experimental methods play a significant role in solid mechanics.
Author: Valeriĭ Pavlovich Shchepinov
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 512
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Book Description
In this unique book, Shchepinov and his colleagues introduce and discuss the development and application of the increasingly important technique; holographic and speckle interferometry employed in the investigation of structure and material deformation and fracture processes. The authors consider the main physical and metrological aspects of interferometry from the deformation analysis viewpoint, emphasizing the need for (and the difficulties in obtaining) high quality and accurate fringe patterns. The advantages and outstanding features of the techniques are discussed in the second part of the book and these are compared with conventional methods of experimental mechanics. The book is illustrated with numerous unique interferograms to demonstrate the various fringe patterns which must be quantitively interpreted to obtain strain and stress values with the required accuracy. All fringe patterns presented are primary sources of the corresponding displacement and strain distributions contained in the book. The results illustrate how holographic and speckle interferometry can be used for development in various scientific and applied subjects in the fields of solid and fracture mechanics. Written specifically for researchers and engineers specializing in the strength of structures and materials, this book will also serve to introduce students to the fundamentals of holographic and speckle interferometry and the way these methods can be applied in experimental mechanics.
Author: Alberto Carpinteri
Publisher: Springer Science & Business Media
ISBN: 9400961499
Category : Science
Languages : en
Pages : 210
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Book Description
In this volume on the mechanics of fracture of Portland cement concrete, the general theme is the connection between microstructural phenomena and macroscopic models. The issues addressed include techniques for observation over a wide range of scales, the influence of .microcracking on common measures of strength and de formability , and ultimately, the relationship between microstructural changes in concrete under load and its resistance to cracking. It is now commonly accepted that, in past attempts to force-fit the behavior of concrete into the rules of linear elastic fracture mechanics, proper attention has not been paid to scale effects. Clearly, the relationships among specimen size, crack length and opening, and characteristic material fabric dimensions have been, in comparison to their counterparts in metals, ceramics, and rocks, abused in concrete. Without a fundamental understanding of these relationships, additional testing in search of the elusive, single measure of fracture toughness has spawned additional confusion and frustration. No one is in a better position to document this observation than Professor Mindess.
Author: Gregory R. Toker
Publisher: CRC Press
ISBN: 143988188X
Category : Technology & Engineering
Languages : en
Pages : 211
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Book Description
Transparent in the visible range, phase objects can be studied in the optical range using holographic interferometry. Typically, the holograms are recorded on high-resolving-power holographic photo materials, but a lower spatial resolution is sufficient for successful research in many scientific applications. Holographic Interferometry: A Mach–Zehnder Approach offers practical guidance to research scientists and engineers using Mach–Zehnder holographic interferometry methods to study phase objects in the laboratory. The Mach–Zehnder approach allows the use of standard photographic film and electronic CCD/CMOS sensors with low resolving power, making it a simpler and more affordable option for testing many types of phase objects. This book demonstrates how to use standard photographic film for the optical recording and reconstruction of Mach–Zehnder holograms. It also illustrates techniques for using CCD/CMOS cameras to digitally record Mach–Zehnder holograms/interferograms of transparent objects. Bringing together original research and information scattered throughout existing literature, this book focuses on the holographic reference beam and shearing interferometry methods. In particular, it looks at how these methods and optical schemes can be directly applied to testing aerodynamic flows, as well as to plasmas, shocks, and waves in noncoherent laser–matter interactions. Numerous reconstructed and classic interferograms, deflectograms, and Schlierengrams illustrate the material, helping readers develop and design their own optimal optical scheme and choose applicable details to apply the approach. Describing methods in a mathematically simple and accessible way, this book is also suitable for graduate students in the fields of aerospace engineering and optics, as well as those in laser, thermal, and plasma physics.
Author: R. S. Sirohi
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Science
Languages : en
Pages : 780
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Book Description
Applications of holographic interferometry are so vast that they are limited only by the imagination of the researchers. This collection represents a variety of HI applications, from micro-crack detection in ancient paintings to holographic testing of nuclear technology.
Author: Yves Carmel
Publisher:
ISBN:
Category : Elastoplasticity
Languages : en
Pages : 202
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Book Description
