A fibre optic sensor capable of discriminating between temperature and strain,
using a single fibre Bragg grating, is presented. The technique exploits the
core–cladding mode coupling of a tilted fibre Bragg grating (TFBG). The core and
cladding modes exhibit different thermal sensivities, while the strain
sensivities are approximately equal. Monitoring the core–core mode coupling
resonance and the core–cladding mode coupling resonance of the TFBG spectrum
allows the separation of the temperature and strain induced wavelength
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