Bragg intra-grating sensing: implications for smart structures

Raymond M. Measures; Shang Yuan Huang; Michel LeBlanc; Myo Myint Ohn; A. Tino Alavie

doi:10.1117/12.173975

1 May 1994 Bragg intra-grating sensing: implications for smart structures

Raymond M. Measures, Shang Yuan Huang, Michel LeBlanc, Myo Myint Ohn, A. Tino Alavie

Proceedings Volume 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation; (1994) https://doi.org/10.1117/12.173975
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

Abstract

Intracore fiber optic Bragg gratings have many attractive features that make them well suited for smart structures. The Bragg grating laser sensor makes optimum use of the optical energy and a 4-channel system has recently been demonstrated in connection with a fiber optic sensing system installed in a new highway bridge. In this paper we introduce the new concept of Bragg `intra-grating' sensing whereby additional sensing information from within the grating can be extracted. We show theoretically that the presence of a strain gradient across a Bragg grating distorts its reflection spectrum and have verified this with a preliminary experiment. We also show that debonding of the Bragg grating from its host structure can be detected by changes in the reflection spectrum providing a warning of sensor malfunction.

Citation Download Citation

Raymond M. Measures, Shang Yuan Huang, Michel LeBlanc, Myo Myint Ohn, and A. Tino Alavie "Bragg intra-grating sensing: implications for smart structures", Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); https://doi.org/10.1117/12.173975

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