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Proceedings Paper

Smart optical waveguide sensors for cumulative damage assessment
Author(s): Otto J. Gregory; William B. Euler; Everett E. Crisman; Hanan Mogawer; Kimberly A. Thomas
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Paper Abstract

A strain gage is being developed, based on optical modulation that is capable of gage factors on the order of 500 for stains in excess of 2000 (mu) (epsilon) . The strain sensing element is a coated, hollow, glass waveguide of dimensions 0.5 mm ID X 1mm X OD X 100mm long. Since the geometry is compatible with standard telecommunication optical fiber such gages it can be readily incorporated into smart system arrays for damage assessment in structure such as buildings, roads and bridges. Optical fibers bring the excitation light signal to and the response signal for the sensing element. The small diameter glass tubes act as the substrate for a multiple thin film layers which can be optimized to provide the maximum dynamic range for a predetermined strain excursion. The sensor respond to bending strain by attenuation the optical intensity of the excitation signal. The gage elements exhibit little or no hysteresis and are insensitive to temperature. Also, they are environmentally stable and are not affected by factors such as corrosion or electromagnetic fields. The preliminary experimental result will be presented for this type of strain gage system operating to 2000 (mu) (epsilon) . Also, the model for the physical process will be discussed.

Paper Details

Date Published: 18 May 1999
PDF: 9 pages
Proc. SPIE 3671, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, (18 May 1999); doi: 10.1117/12.348659
Show Author Affiliations
Otto J. Gregory, Univ. of Rhode Island (United States)
William B. Euler, Univ. of Rhode Island (United States)
Everett E. Crisman, Univ. of Rhode Island (United States)
Hanan Mogawer, Univ. of Rhode Island (United States)
Kimberly A. Thomas, Univ. of Rhode Island (United States)

Published in SPIE Proceedings Vol. 3671:
Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu, Editor(s)

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