Abstract: A metrology system combining three laser speckle measurement techniques for simultaneous determination of 3D shape and micro- and macroscopic deformations is presented. While microscopic deformations are determined by a combination of Digital Holographic Interferometry (DHI) and Digital Speckle Photography (DSP), macroscopic 3D shape,

This is accomplished with holographic interferometry, wherein interferometry is carried out with holographically generated wavefronts. A speckle pattern is generated when an object with a rough surface is illuminated with a highly coherent source of light such as laser.

View Academics in Laser Speckle on Academia.edu. Enter the email address you signed up with and we'll email you a reset link. Electronic speckle pattern interferometry (ESPI) is demonstrated using a simple configuration consisting of a wedged window and a beamsplitter. The window Laser speckle interferometry for plate bending problems. Fu-Pen Chiang and Ren-Ming Juang.

Använd laserspeckler för eng. laser speckles. Kommentar Använd speckelinterferometri för eng. speckle interferometry. Kommentar. 1999-01-22 laser speckles, se laserspeckler laservibrometri, se under diffust laserljus Använd speckelinterferometri för eng.

speckle depend on the parameters of a probe laser beam, the characteristics of the reŒecting surface, and the proper-ties of the optical system used for illumination and detection. To optimise the parameters of a laser beam, a focusing system, and a photodetector, it is necessary to have information on the basic parameters of the speckle pattern.

Guest Editorial. Recent developments in digital speckle pattern interferometry. The last 10 years have The principal speckle interferometry techniques are ESPI (electronic speckle pattern In ESPI, laser light is divided into illumination and reference beams by a The laser beam is as before split into two seperate beams.

Before the milestone work of Leedertz in 1970 coherent speckles generated from a laser illuminated object are considered noise to be eliminated or minimized. Leedertz shows that coherent speckles are actually information carriers.

The generation of a random intensity distribution, called a speckle pattern, when light from a highly coherent source, such as a laser, is scattered by a rough surface or Laser speckle interferometry for welding inspection Laser speckle interferometry for welding inspection Suprapedi, -; Widiastuti, Rini; Toyooka, Satoru 1999-05-07 00:00:00 ABSTRACT Degradation processes of welded materials from the beginning of tensile until fracture were investigated by laser speckle interferometry (LSI). In the LSI system, speckle patterns are acquired continuously by a CCD the focused beam.

The device was designed to be versatile with the We performed experimental evaluation of various positions (ear, paw, and tail) of the of dynamic light scattering sensor of near-infrared laser radiation (840 nm) using speckle interferometry in rats. Dynamic monitoring of the reactions to prolonged ultrasound exposure (7 days) showed that the base … Laser Speckle Photography As A Practical Alternative To Holographic Interferometry For Measuring Plate Deformation A. E. Ennos M. S. Virdee National Physical Laboratory (United Kingdom) Although holographic interferometry is in theory capable of measuring the three-dimensional deformation of a strained body, in practice its most frequent use OSTI.GOV Journal Article: Remote laser speckle interferometry: A speckle pattern formation model Abstract . Laser Interferometry and Holography are well-established, highly sensitive techniques for non-destructive testing and analysis. These techniques can be usefully applied in the field of Historical and Cultural Heritage conservation, for reconstruction of 3D structure of the object under observation and its deformation under stress. Speckle interference patterns need in any case a kind of further decoding step in order to become a source of useful information.
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this adding and extinction of phases is called speckle and will appear as. av S Simonson · 2012 · Citerat av 1 — Helfältsmätning med laseroptiska metoder .

In ESPI, laser light is divided into illumination and reference beams by a beamsplitter.
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In this work, an X-ray nanobeam of a free-electron laser was generated using reflective KB focusing optics combined with speckle interferometry. The speckle profiles generated by 2 nm platinum particles were systematically investigated on a single-shot basis by changing the alignment of the multilayer KB mirror system installed at the SPring-8 Angstrom Compact Free-Electron Laser, in combination with computer simulations.

Speckle interferometry is a density sensitive line-of-sight flow visualization techniques which allows simultaneous quintitative measurements of deflection angles of the laser light passed through the flow [1]. Digital versions of PIV and speckle interferometry (SI) improve significantly the possibilities of the techniques [1, 2]. In this work, the possibility to use of a speckle interferometry method as a basis for the tracking system of cornea structural changes at thermal influence of a nondestructive laser radiation is considered. Also for a cornea, the polymeric phantom was picked up . A new experimental technique has been devised to measure residual stresses in ductile materials with a combination of laser speckle pattern interferometry and spot heating. The speckle pattern interferometer measures in-plane deformations while the heating provides for very localized stress relief. Experiments using a pulsed ruby laser to detect the movement of an object surface are reported.