Strain and torque measurements on cylindrical objects using the laser speckle strain gauge

First, the theory of diffraction field speckle displacement is extended to include speckle patterns arising from a cylindrical object subject to general deformation. Second, the usefulness of the derived relations are demonstrated by measuring the axial strain component on a Teflon cylinder and torq...

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Bibliographic Details
Published in:Optical Engineering 1996-04, Vol.35 (4), p.1179-1186
Main Authors: Sjo¨dahl, Mikael, Yamaguchi, Ichirou
Format: Article
Language:English
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Summary:First, the theory of diffraction field speckle displacement is extended to include speckle patterns arising from a cylindrical object subject to general deformation. Second, the usefulness of the derived relations are demonstrated by measuring the axial strain component on a Teflon cylinder and torque (shear strain) on a twisted steel cylinder. We performed real-time measurement of these quantities using the setup adopted for the laser speckle strain gauge. With this equipment, we obtained resolutions of 37.5 strain in the axial strain measurement and of 1.8 N m in the torque measurement. Both experiments agreed within 4% with simultaneous results obtained from an electrical strain gauge and with the known applied torque. ©
ISSN:0091-3286
1560-2303
1560-2303
DOI:10.1117/1.600606