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Title: Multiple rotation assessment through isothetic fringes in speckle photography

Abstract

The use of different pupils for storing each speckled image in speckle photography is employed to determine multiple in-plane rotations. The method consists of recording a four-exposure specklegram where the rotations are done between exposures. This specklegram is then optically processed in a whole field approach rendering isothetic fringes, which give detailed information about the multiple rotations. It is experimentally demonstrated that the proposed arrangement permits the depiction of six isothetics in order to measure either six different angles or three nonparallel components for two local general in-plane displacements.

Authors:
; ;
Publication Date:
OSTI Identifier:
20929693
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Optics; Journal Volume: 46; Journal Issue: 14; Other Information: DOI: 10.1364/AO.46.002676; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; IMAGES; INTERFEROMETRY; PHOTOGRAPHY; ROTATION; VISIBLE RADIATION

Citation Formats

Angel, Luciano, Tebaldi, Myrian, and Bolognini, Nestor. Multiple rotation assessment through isothetic fringes in speckle photography. United States: N. p., 2007. Web. doi:10.1364/AO.46.002676.
Angel, Luciano, Tebaldi, Myrian, & Bolognini, Nestor. Multiple rotation assessment through isothetic fringes in speckle photography. United States. doi:10.1364/AO.46.002676.
Angel, Luciano, Tebaldi, Myrian, and Bolognini, Nestor. Thu . "Multiple rotation assessment through isothetic fringes in speckle photography". United States. doi:10.1364/AO.46.002676.
@article{osti_20929693,
title = {Multiple rotation assessment through isothetic fringes in speckle photography},
author = {Angel, Luciano and Tebaldi, Myrian and Bolognini, Nestor},
abstractNote = {The use of different pupils for storing each speckled image in speckle photography is employed to determine multiple in-plane rotations. The method consists of recording a four-exposure specklegram where the rotations are done between exposures. This specklegram is then optically processed in a whole field approach rendering isothetic fringes, which give detailed information about the multiple rotations. It is experimentally demonstrated that the proposed arrangement permits the depiction of six isothetics in order to measure either six different angles or three nonparallel components for two local general in-plane displacements.},
doi = {10.1364/AO.46.002676},
journal = {Applied Optics},
number = 14,
volume = 46,
place = {United States},
year = {Thu May 10 00:00:00 EDT 2007},
month = {Thu May 10 00:00:00 EDT 2007}
}
  • In this article, a novel artificial submicro- or nanometer speckle fabricating technique is proposed by taking advantage of submicro or nanometer particles. In the technique, submicron or nanometer particles were adhered to an object surface by using ultrasonic dispersing technique. The particles on the object surface can be regarded as submicro or nanometer speckle by using a scanning electronic microscope at a special magnification. In addition, an electron microscope speckle photography (EMSP) method is developed to measure in-plane submicron or nanometer deformation of the object coated with the artificial submicro or nanometer speckles. The principle of artificial submicro or nanometermore » speckle fabricating technique and the EMSP method are discussed in detail in this article. Some typical applications of this method are offered. The experimental results verified that the artificial submicro or nanometer speckle fabricating technique and EMSP method is feasible.« less
  • The effects of low-frequency vibrations on speckle correlation fringes have been investigated. The relatively short capture time of the camera in the low-frequency case may yield usable fringe contrast in spite of vibration. It has been shown that the fringes also shift due to the vibration. The study is in agreement with experimental observations of good-contrast correlation fringes even if the object is not on a vibration-isolated table. Some such experimental observations are also presented. {copyright} {ital 1998 Society of Photo-Optical Instrumentation Engineers.}
  • This study demonstrates that speckle photography can be used to determine simultaneously the density gradients in a freely burning flame for various directions of observation. Results of the study indicated that laser speckle photography can be used to obtain reliable quantitative data on density-gradient fields for both laminar and turbulent flows.
  • Laser and white light speckle photography have been used to observe surface displacement in a number of materials and over a varied range of strain rates. However, each suffers from limitations. We have developed a novel application of speckle photography in very difficult environments by using laser-induced fluorescence to generate the speckle pattern. This permits confinement of the free surface without undue degradation of the correlation upon which speckle methods are based. We have applied this method to measure the surface displacement of a reactive material during dynamic deformation at moderate strain rates. Conventional methods were tried but were unsuccessful,more » necessitating a novel approach. To the best of our knowledge, neither high-speed laser nor white light speckle photography has been performed using energetic materials. These measurements are very difficult because of the low material strength (yield strength {approximately}8{endash}80 MPa), and because significant out-of-plane motion and surface disruption occur during fracture, and early during the deformation process. We report results from experiments in which these major problems have been overcome. {copyright} {ital 1997 American Institute of Physics.}« less
  • A technique has been developed to determine experimentally the three-dimensional displacement field on the rear surface of a dynamically deforming plate. The technique combines speckle analysis with stereoscopy, using a modified angular-lens method: this incorporates split-frame photography and a simple method by which the effective lens separation can be adjusted and calibrated in situ. Whilst several analytical models exist to predict deformation in extended or semi-infinite targets, the non-trivial nature of the wave interactions complicates the generation and development of analytical models for targets of finite depth. By interrogating specimens experimentally to acquire three-dimensional strain data points, both analytical andmore » numerical model predictions can be verified more rigorously. The technique is applied to the quasi-static deformation of a rubber sheet and dynamically to Mild Steel sheets of various thicknesses.« less