Computer-aided Holographic Interferometry for Measurement of Axisymmetric Thermal and Species Boundary Layers PDF Download

Author: Patrick Robert Griffin
Publisher:
ISBN:
Category :
Languages : en
Pages : 340

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Author: Gregory S. Meserve
Publisher:
ISBN:
Category :
Languages : en
Pages : 72

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Book Description
Unique optical data from the laminar and transition regions of an axisymmetric free convection thermal boundary layer are presented. The boundary layer encompasses a vertically oriented right circular cylinder kept at a constant wall temperature and suspended in a quiescent air environment. Pulse laser holographic interferometry was used to obtain a measurement of the temperture distribution through the boundary layer. Schlieren methods are used to photograph the boundary layer to provide a qualitative description of the transition region. An approach is outlined to find an approximate numerical solution for the temperture distribution through the boundary layer. Integral equations are developed for a differential control volume within the boundary layer after which assumed velocity and temperature distributions are used to reduce the integral equations to first order non-linear differential equations. The differential equations are non-dimensionalized and numerical techniques are used in an attempt to obtain a solution. Quantitative data from the laminar region resulted in a discrepancy between theoretical and experimental evaluation of a local Nusselt number. Qualitative observation of the transition region reveals a fringe reversal phenomena that could possibly be associated with the fundamental mechanisms of transition. (Author).

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:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 780

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Book Description

Author: Thomas Kreis
Publisher: Wiley-VCH
ISBN: 9783527405466
Category : Science
Languages : en
Pages : 554

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Book Description
The book presents the principles and methods of holographic interferometry - a coherent-optical measurement technique for deformation and stress analysis, for the determination of refractive-index distributions, or applied to non-destructive testing. Emphasis of the book is on the quantitative computer-aided evaluation of the holographic interferograms. Based upon wave-optics the evaluation methods, their implementation in computer-algorithms, and their applications in engineering are described.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
Laser holographic interferometry was applied to the measurement of density profiles of two-dimensional planar turbulent boundary layers on the wall of the Acoustic Research Tunnel (ART) at the Arnold Engineering Development Center (AEDC). Holograms were produced at Mach numbers 0.50 and 0.65 by the finite fringe, single-plate, dual-exposure method. The reconstructed image from this type of hologram contains fringes that are shifted relative to a reference fringe by an amount that is proportional to the difference in the densities at the two points. Therefore, it was possible to determine the density profiles by measuring the fringe shifts appearing in the reconstructed images. The results of two velocity-temperature relations are presented, and compared to data obtained by pitot, hot-wire, and split-film probes. A description of the experimental facility, hardware for data acquisition, data reduction methods, and a discussion of the problems encountered in the holographic interferometry technique are presented.

Author: Pramod K. Rastogi
Publisher: Springer
ISBN: 9783662139899
Category : Technology & Engineering
Languages : en
Pages : 329

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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: 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: Stephen Emil Dunagan
Publisher:
ISBN:
Category :
Languages : en
Pages : 526

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 956

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Book Description