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Proceedings Paper

Coaxial cable Bragg grating sensors for large strain measurement with high accuracy
Author(s): Jie Huang; Tao Wei; Xinwei Lan; Jun Fan; Hai Xiao
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Paper Abstract

In this paper, a new coaxial cable Bragg grating (CCBG) is developed as a strain sensor and the sensor's capacity for large range strain measurement in structural health monitoring (SHM) is demonstrated for the first time. The sensor device is comprised of regularly spaced periodic discontinuities along a coaxial cable. The discontinuities are fabricated using a computer numerical controlled (CNC) machine to drill holes in the cable. Each discontinuity generates a weak reflection to the electromagnetic wave propagating inside the cable. Superposition of these weak reflections produces a strong reflection at discrete frequencies that can be explained by Bragg grating theory. By monitoring the resonant frequency shift of the sensor's reflection or transmission spectra, strain measurement sensitivity of 20με and a dynamic range of 50000με (5%) were demonstrated for axial strain measurements. The experimental results show that the CCBG sensors perform well for large strain measurement needed in structural health monitoring (SHM).

Paper Details

Date Published: 6 April 2012
PDF: 9 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83452Z (6 April 2012); doi: 10.1117/12.915035
Show Author Affiliations
Jie Huang, Missouri Univ. of Science and Technology (United States)
Tao Wei, Missouri Univ. of Science and Technology (United States)
Xinwei Lan, Missouri Univ. of Science and Technology (United States)
Jun Fan, Missouri Univ. of Science and Technology (United States)
Hai Xiao, Missouri Univ. of Science and Technology (United States)


Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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