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20 March 1997 Selective-diffraction-order-based sensitive grating shearing interferometer for partial slopes and curvatures of bent plates
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Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269817
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore
Abstract
Coherent collimated beam of light, reflected by laterally loaded specularly reflecting front surface of a thin plate is diffracted by a single frequency cross grating placed in between a long focal length field lens and the plate. Combinations of different orders, depending on the results sought, are selectively permitted through the Fourier transform plane where, irrespective of the grating position, the diffracted beams come to focus. The interference of these beams at the recording plane causes the formation of moire fringes. Partial curvature and twist contours are obtained from single exposure while partial slope contours require double exposure. This simple, flexible, in-situ filtering technique thus helps in the complete analysis of plates under lateral loading. It also overcomes limitations with earlier techniques that placed the grating at or after the lens plane.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Subramaniam and K. Jancy Rose "Selective-diffraction-order-based sensitive grating shearing interferometer for partial slopes and curvatures of bent plates", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269817
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