13 October 2008 Measurement and testing by digital speckle correlation
Author Affiliations +
Abstract
Uses of digital correlation analysis of speckle intensities are described in measurements and monitoring of rough surfaces. First, theoretical relationships for correlation properties of speckle patterns are surveyed in terms of the intensity cross-correlation between two patterns. They consist of speckle displacement and decorrelation, each of which is related to the position and the reduction of correlation peak, respectively. For examples, speckle displacement is applied to measurement of strain by a laser-speckle strain gauge and a speckle extensometer both of which are perfectly non-contacting. Speckle decorrelation is used for the measurements of surface roughness and monitoring of paint drying process. Relationships with digital holography that enables to derive 3-d speckle cross-correlation are also mentioned.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ichirou Yamaguchi, "Measurement and testing by digital speckle correlation", Proc. SPIE 7129, Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration, 71290Z (13 October 2008); doi: 10.1117/12.807376; https://doi.org/10.1117/12.807376
PROCEEDINGS
9 PAGES


SHARE
Back to Top