Hetero-core fiber Bragg grating for simultaneous measurement of strain and bending based on cladding mode ratiometric detection |
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| Authors: | An Sun Zhishen Wu |
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| Institution: | 1. International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China;2. Department of Urban and Civil Engineering, Ibaraki University, Hitachi 316-8511, Japan |
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| Abstract: | A simple but practical method using multimode-single mode fiber Bragg grating (FBG) for cladding mode based simultaneous measurement of strain and bending is proposed and investigated experimentally. Experimental results show that the intensity ratio between cladding mode and FBG resonance of hetero-core FBG show monotonous changes following with the increase of deflection, by which strain and bending discrimination can be achieved by measuring the wavelength shift of FBG resonance and ratiometrically detecting the intensity changes between cladding modes and FBG resonance. |
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| Keywords: | Fiber optic sensor Fiber Bragg grating Strain measurement Bending measurement |
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