7 March 2006 Surface strain characterization using time-division-multiplexed 3D shearography
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Abstract
In this paper the application of a time-division-multiplexed 3D-shearography instrument to the measurement of the surface strain of a non-planar object is described. The object under investigation is sequentially illuminated from three directions by three fibre coupled high power laser diode sources, and imaged onto a CCD camera through a single shearing interferometer. The pulsing of the sources, achieved by injection current modulation, is synchronised with the camera frame rate. The source pulsing schedule and image acquisition are controlled from a PC. The slope and shape of the object’s surface are measured by displacing one of the illumination fibres. Combining the slope and shape information with the deformation gradient measurement allows the surface strain to be determined.
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Stephen W. James, Roger M. Groves, Ralph P. Tatam, "Surface strain characterization using time-division-multiplexed 3D shearography", Proc. SPIE 4101, Laser Interferometry X: Techniques and Analysis, (7 March 2006); doi: 10.1117/12.498404; https://doi.org/10.1117/12.498404
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