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Description
To evaluate the state of health of the composite, a real-time, in-situ acoustic emission (AE) damage detection system has been developed, where the monitoring of AE activity emitted from within a carbon/epoxy composite material (CFRP) is achieved using an all-fibre Mach-Zehnder interferometric sensor. The basic Mach-Zehnder configuration was modified to achieve the sensitivity needed to detect the low amplitude signals associated with AE. An active homo dyne feedback loop was employed to maintain quadrature, whereas polarisation controllers ensured that the state of polarisation of the guided beams were equal. Two additional components were included in the AE detection system; fibre collimators and a demountable composite test section. The fibre collimators adjusted the optical path length in one of the arms of the interferometer to help maintain system sensitivity from test to test. The demountable test section ensured ease of testing, without the need for continual fusion splicing.
Content:-
Abstract
Papers Published
Contents
List of Figures and Tables
Acknowledgements
Declaration
1. Introduction
2. Survey Of Possible Non-Destructive Evaluation Techniques As It Applies To Composites
3. Acoustic Emission in Composite Materials
4. Optical Fibre Sensing Of Acoustic Emission
5. Development Of The Fibre Optic Acoustic Emission Detection System
6. Experiments Using The Optical Fibre Acoustic Emission Sensor
7. Experiments using the Piezoelectric Transducer
8. Discussions and Recommendations for Future Work
9. Thesis Overview and Conclusions
Appendices
Appendix A. Experimental Procedures And Signal Processing Details
Appendix B. Analysis Of The Results From The Fibre Optic Sensor Tests
Appendix C. Analysis Of The Results From The Fibre Optic Sensor Tests
Appendix D. Papers Published
References
Author Details
"Paul W.R. Baillie"
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