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Proceedings Paper

Whole field displacement and strain rosettes by grating objective speckle method
Author(s): Meirong Tu; Peter J. Gielisse; Wei Xu
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Paper Abstract

The grating objective speckle method was applied for whole field displacement measurements to a high transition temperature superconductor (Y Ba2Cu3Ox) disk under diametral-compression. Four fringe patterns were obtained from one single specklegram, indicating the displacement components along four different directions, with 45 degree intervals. The spatial frequencies, which represent the sensitivities of the fringe intervals, were 2400 lines/mm for Ux and Uy, and 1697 lines/mm for U45 and U135, respectively. The normal strain components, εx, εy, ε45, and ε135, can be directly transformed. The shear strain, γxy, can therefore, be calculated by the rosette equations without the need for first cross-derivatives from two displacement contour maps, which is highly sensitive to accidental rigid-body rotations. The technique provides an extremely simple set-up for the recording system. There axe no laser, no camera, no laborious optical alignment and no requirement for vibration isolation.

Paper Details

Date Published: 1 December 1991
Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49499
Show Author Affiliations
Meirong Tu, Florida State Univ. (United States)
Peter J. Gielisse, Florida State Univ. (United States)
Wei Xu, Florida State Univ. (United States)

Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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