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Temperature and strain discrimination using a single tilted fibre Bragg grating
Authors:Edmon Chehura
Institution:Engineering Photonics Group, School of Engineering, Cranfield University, Cranfield, Bedford MK43 0AL, UK
Abstract: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 shifts.
Keywords:Temperature  Strain  Sensor  Tilted fibre Bragg grating  FBG  TFBG
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