Two-dimensional surface strain measurement based on a variation of Yamaguchi's laser-speckle strain gaugeA novel optical method of measuring 2-D surface strain is proposed. Two linear strains along orthogonal axes and the shear strain between those axes is determined by a variation of Yamaguchi's laser-speckle strain gage technique. It offers the advantages of shorter data acquisition times, less stringent alignment requirements, and reduced decorrelation effects when compared to a previously implemented optical strain rosette technique. The method automatically cancels the translational and rotational components of rigid body motion while simplifying the optical system and improving the speed of response.
Document ID
19910070908
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Barranger, John P. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Optical Testing and Metrology III: Recent Advances in Industrial Optical Inspection