Large deflection measurements in structures using diffraction gratings

Peter L. Fuhr; Dryver R. Huston; Timothy P. Ambrose; Adam P. McPadden

doi:10.1117/12.207738

20 April 1995 Large deflection measurements in structures using diffraction gratings

Peter L. Fuhr, Dryver R. Huston, Timothy P. Ambrose, Adam P. McPadden

Proceedings Volume 2446, Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways; (1995) https://doi.org/10.1117/12.207738
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

An optical technique has been developed whereby two angles and linear displacement can be simultaneously measured in a non-contact manner. The method depends upon the usage of a diffraction grating with linear variation of period along its length. The grating is attached to a structure at a point of interest while all other system components are placed at a remote location. Evaluation of this measurement technique has been demonstrated on a laboratory- based structure which simulated conditions found at deep trench (or tunnel) walls or bracing systems. In a construction site configuration, this sensor allows the user to determine if the walls are undergoing structural deformation. In addition, the magnitude of deformation may be measured and alarm conditions may be monitored. Experimental results obtained using this technique are presented and compared with theory.

Citation Download Citation

Peter L. Fuhr, Dryver R. Huston, Timothy P. Ambrose, and Adam P. McPadden "Large deflection measurements in structures using diffraction gratings", Proc. SPIE 2446, Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways, (20 April 1995); https://doi.org/10.1117/12.207738

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