Internal Monitoring of Acoustic Emission in Graphite-Epoxy Composites Using Imbedded Optical Fiber Sensors
K. D. Bennett,R. O. Claus,M. J. Pindera +2 more
- pp 331-335
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TLDR
In this paper, a modified Michelson interferometer is used to measure the time-dependent normal component of surface displacement at the location of that spot. But the authors do not consider the application of interferometric optical sensing techniques for acoustic emission.Abstract:
The monitoring of acoustic emission (AE) is an important technique for the nondestructive characterization of strained materials because time and frequency domain analyses of AE events yield information about the type, geometry, and location of defects, as well as how material failure may occur. The quantitative interpretation of AE event signatures is critically dependent upon the faithfulness of the acoustic transduction and signal processing system in reproducing localized stress wave amplitude as a function of time. Although the usual sensor for acoustic emission is the piezoelectric transducer, several investigators have considered the application of interferometric optical sensing techniques which offer good spatial resolution and frequency response [1,2]. These techniques typically focus one beam of a modified Michelson interferometer to a small spot on the surface of a specimen and measure the time-dependent normal component of surface displacement at the location of that spot.read more
Citations
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Smart structures with nerves of glass
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Use of optical fibre for damage and strain detection in composite materials
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Detection of acoustic emission in structure using Sagnac-like fiber-loop interferometer
Libo Yuan,Li Min Zhou,Wei Jin +2 more
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Acoustic emission detection of damage induced by simulated environmental conditioning in carbon fiber reinforced composites
TL;DR: In this article, the effects of simulated environmental aging on carbon fiber reinforced composites were investigated. But the authors only applied acoustic emission analysis to study the effects on the mechanical response of the composites.
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Embedded optical fiber sensors for materials evaluation
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References
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Journal ArticleDOI
Optical fiber acoustic sensor utilizing mode-mode interference.
M. R. Layton,Joseph A. Bucaro +1 more
TL;DR: A method for detecting sound using a single step-index multimode fiber is presented and it is found that this approach is approximately 10(-3) less sensitive than the single-mode interferometer arrangement.
Book
Optical Fibre Sensing and Signal Processing
TL;DR: In this article, the potential of this powerful technology and demonstrates where the electronics and the mechanical engineering can play their part in the design of a real practical system, and the potential for this technology is discussed.
Journal ArticleDOI
Fibredyne systems for passive or semipassive fibre-optic sensors
TL;DR: In this paper, the authors show how very simple passive and semi-passive sensors can be constructed using fibredyne detection of optical echoes, which can be used to detect end reflections in single-mode and multimode optical fibres.
Journal ArticleDOI
A comparison of optically and piezoelectrically sensed acoustic emission signals
TL;DR: In this paper, the authors proposed optical transducers to provide accurate, quantitative, highly localized information; they do not disturb the waves being measured and are not limited by frequency response.