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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
19900013468
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Barranger, John P. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
Lasers And Masers
Report/Patent Number
NAS 1.15:103162
NASA-TM-103162
E-5530
Meeting Information
Meeting: Conference on Optical Testing and Metrology 3
Location: San Diego, CA
Country: United States
Start Date: July 8, 1990
End Date: July 13, 1990
Sponsors: Society of Photo-Optical Instrumentation Engineers
Accession Number
90N22784
Funding Number(s)
PROJECT: RTOP 582-01-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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