1. A polarisation maintaining fibre Bragg grating interrogation system for multi-axis strain sensing
- Author
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Ralph P. Tatam, Stephen E. Staines, Stephen W. James, and Chen-Chun Ye
- Subjects
Transverse strain ,Materials science ,Optics ,Strain (chemistry) ,Fiber Bragg grating ,business.industry ,Multi axis ,Fibre optic sensors ,business ,Strain gradient ,Interrogation ,Doppler broadening - Abstract
In this paper we report the development of a FBG (fibre Bragg grating) interrogation system, that is capable of detecting independently the two orthogonally polarised signals reflected from a FBG fabricated in a PM (polarisation maintaining) fibre. The interrogation system imposes no limitation on the measurable strain. It is possible to detect a strain gradient by measuring independently the spectral broadening of the two polarised signals. The system has been used to fabricate and characterise FBGs in different PM fibres. As a demonstration of the feasibility of the interrogation system for multi-axis strain sensing, the transverse strain sensing characteristics of PM FBGs are presented.
- Published
- 2003
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