NDLI: Laser Speckle Interferometry for Measuring Three-Dimensional Mesoscopic Deformations in Polycrystalline Surfaces

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Laser Speckle Interferometry for Measuring Three-Dimensional Mesoscopic Deformations in Polycrystalline Surfaces

Content Provider	Semantic Scholar
Author	Smith, Timothy P. L. Bassman, Lori C. Lalji, Zamir Flynn, Eric B. Leung, Tommy W. C. Cramer, S. N. Gersdorff, Nick Von Greenfield, Scott R. Koskelo, Aaron C.
Copyright Year	2005
Abstract	Submitted for the MAR05 Meeting of The American Physical Society Laser Speckle Interferometry for Measuring Three-Dimensional Mesoscopic Deformations in Polycrystalline Surfaces TIMOTHY SMITH, LORI BASSMAN, ZAMIR LALJI, ERIC FLYNN, TOMMY LEUNG, SEAN CRAMER, NICK VONGERSDORFF, Harvey Mudd College, SCOTT GREENFIELD, AARON KOSKELO, Los Alamos National Laboratory — A speckle interferometric microscope has been constructed to simultaneously measure mesoscopic deformations in all three directions at a surface. The purpose is to understand mesoscale mechanics in polycrystalline materials using direct observation. The microscope uses three different wavelength lasers to separate dimensional data (out-ofplane and two in-plane directions) while capturing the intensity of speckle reflected from a surface as a function of position and time. Images are captured before and after deformation, with an intermediate image taken before deformation but with a mirror in one arm of each interferometer tilted. Post-processing exploits the mirror tilts to produce carrier fringes that isolate deformation data in Fourier space and increase sensitivity by orders of magnitude over traditional interferometry. Data are taken with 1 μm spatial resolution, and 10 nm deformations have been resolved. Experiments underway are using the system to study polycrystalline creep. Timothy Smith Harvey Mudd College Date submitted: 07 Dec 2004 Electronic form version 1.4
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://absimage.aps.org/image/MAR05/MWS_MAR05-2004-005880.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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