Real-time Laser Holographic Interferometry for Aerodynamics PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author: Frank D. Adams
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages : 68
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Book Description
Calculations and experiments were performed to show that the fringe patterns on a vibrating structure, as observed using real-time holographic interferometry, has a substantially increased contrast ratio if the laser illumination is amplitude modulated by a sequence of pulses which are synchronized with the vibration. The time and effort required to obtain interferometric data using this method is an order of magnitude less than that needed when using time-average holographic interferograms. Potential applications include experimental studies of fatigue damage, crack detection and propagation, flaw detection in composite and honeycomb structures as well as vibration analysis of structural members.
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: Charles M. Vest
Publisher: Wiley-Interscience
ISBN:
Category : Photography
Languages : en
Pages : 496
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Book Description
A unified, comprehensive, self-contained treatment of theory, practice, and application, including related coherent optical techniques. Emphasizes quantitative evaluation of holographic interferograms of both opaque and transparent objects, explaining how tools such as the laser and holography are being applied to present-day measurement problems. Applies clear, simple, physical reasoning to present practical information and data; circumvents complicated mathematics wherever possible. Includes over 700 cited references, numerous line drawings and photographs, and several useful tables and equations relating optical data to physical properties.
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: 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:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 440
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Book Description
Author: Tse-Fou Zien
Publisher:
ISBN:
Category : Holographic interferometry
Languages : en
Pages : 120
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Book Description
Holographic interferometry was successfully applied to a large-scale wind tunel (40-cm x 40-cm test section) experiment on a three-dimensional flow field. The laser interferometer was set up in a schlieren bench with a pulsed-ruby laser as the light source. Both the object beam and the reference beam were collimated. The conventional double-exposure, off-axis operation was used to produce interferograms...
Author: Stefano Discetti
Publisher: CRC Press
ISBN: 1498704042
Category : Technology & Engineering
Languages : en
Pages : 611
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Book Description
Experimental Aerodynamics provides an up to date study of this key area of aeronautical engineering. The field has undergone significant evolution with the development of 3D techniques, data processing methods, and the conjugation of simultaneous measurements of multiple quantities. Written for undergraduate and graduate students in Aerospace Engineering, the text features chapters by leading experts, with a consistent structure, level, and pedagogical approach. Fundamentals of measurements and recent research developments are introduced, supported by numerous examples, illustrations, and problems. The text will also be of interest to those studying mechanical systems, such as wind turbines.
Author: Gregory R. Toker
Publisher: CRC Press
ISBN: 1351832670
Category : Technology & Engineering
Languages : en
Pages : 215
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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.
