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Proceedings Paper

Parameters affecting the quality of acquired signals for the global health monitoring of mobile bridges using fiber optic polarimetric sensors
Author(s): Anand Krishna Asundi; Paul Neo Tien Song
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Paper Abstract

Fiber Optic Polarimetric Sensors (FOPS) can be used for static and dynamic integrated deformation/strain measurement. It has also been shown to capture natural and excited frequency response spectra for structural health assessment. This is achieved by relating vibrational frequency changes to structural stiffness variations caused by damage. The deployment of the FOPS for this purpose is a relatively new endeavor and many factors pertaining to its use have yet to be investigated in detail -- including the parameters affecting its signal acquisition and the subsequent interpretation of acquired signals. Using a military mobile bridge as the test specimen, it is found that the FOPS yields a unique frequency spectrum containing information on damage severity and location for each specimen. The reliability of this signature frequency spectrum depends primarily on empirical parameters such as mounting location, method of bonding, type of structural supports used, strength of excitation impact and location of impact. Further, owing to the FOPS' unique global sensing nature, a new damage quantification system has to be used, which is also dependent on the consistency of the signal acquisition process for accuracy. Both finite element and experimental modal analyses were used in the development of an optimal FOPS configuration for signal reliability.

Paper Details

Date Published: 18 August 2003
PDF: 9 pages
Proc. SPIE 5057, Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures, (18 August 2003); doi: 10.1117/12.482681
Show Author Affiliations
Anand Krishna Asundi, Nanyang Technological Univ. (Singapore)
Paul Neo Tien Song, Ministry of Defence, Singapore (Singapore)

Published in SPIE Proceedings Vol. 5057:
Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures
Shih-Chi Liu, Editor(s)

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