Proceedings ArticleDOI
Speckle Photography For Strain Measurement - A Critical Assessment
E. Archbold,A. E. Ennos,M. S. Virdee +2 more
- Vol. 0136, pp 258-265
TLDR
In this paper, a direct experimental comparison of speckle photography with photoelasticity and with finite element analysis on a notched tensile test specimen showed that serious errors could occur due to local surface tilting and to aberrations of the imaging lens.Abstract:
Speckle photography is a simple technique for measuring displacement in the plane of a surface, so allowing the strain field to be evaluated in two dimensions. A direct experimental comparison of speckle photography with photoelasticity and with finite element analysis on a notched tensile test specimen showed that serious errors could, however, occur due to local surface tilting and to aberrations of the imaging lens. Methods of minimising these effects and those of the speckle decorrelation that can also take place, are discussed.© (1978) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.read more
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Journal ArticleDOI
A laser-speckle strain gauge
TL;DR: In this paper, a noncontact and automatic method of measuring surface strain was developed, which makes use of the speckle displacement that is detected by cross correlating the signals from a photodiode array.
Journal ArticleDOI
An electro-optical read-out system for analysis of speckle photographs
TL;DR: An electro-optical read-out system for measuring displacement and strain fields from a double exposure speckle photograph is described in this article, where the optical system uses a cylindrical element to project the 1-D Fourier transform, with minimal distortion of the spacing of the fringe pattern.
Journal ArticleDOI
Random (Speckle) Patterns For Displacement And Strain Measurement: Some Recent Advances
Fu-Pen Chiang,D. W. Li +1 more
TL;DR: In this paper, major advances in using coherent and incoherent speckle patterns for displacement and strain measurements are reviewed, including the laws of spatial movement of laser speckles, the halo functions of coherent and coherent speckLE patterns, decorrelation factors and their effect on the fringe visibility and the upper limit of measurement, new techniques of holospeckle interferometry, real-time and electron microscopic speckler photographies, and automatic processing of Young's fringes.
Sensors for ceramic components in advanced propulsion systems: Summary of literature survey and concept analysis, task 3 report
W. H. Bennethum,L. T. Sherwood +1 more
TL;DR: In this paper, the results of a literature survey and concept analysis related to sensing techniques for measuring of surface temperature, strain, and heat flux for (non-specific) ceramic materials exposed to elevated temperatures (to 2200 K) are summarized.
Proceedings ArticleDOI
Automatic Evaluation Of Young's Fringes Related To The Study Of In-Plane-Deformations By Speckle Techniques
H. Kreitlow,Thomas Kreis +1 more
TL;DR: The Young's fringes diffracted from the double-exposure specklegram are in most applications evaluated manually.