Selective-diffraction-order-based sensitive grating shearing interferometer for partial slopes and curvatures of bent plates

G. Subramaniam; K. Jancy Rose

doi:10.1117/12.269817

20 March 1997 Selective-diffraction-order-based sensitive grating shearing interferometer for partial slopes and curvatures of bent plates

G. Subramaniam, K. Jancy Rose

Author Affiliations +

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available