Interrogation of fibre optic sensors

摘要: The aim of the research work described in this thesis was to investigate interrogation fibre optic sensors using "off shelf optical components and equipment developed mainly for telecommunications industry. This provides a cost effective way bringing sensor systems within price range their electro-mechanical counterparts. focuses on use an arrayed waveguide grating, acousto-optic tuneable filter low-coherence interferometry measure dynamic strain displacement Bragg grating interferometric sensors. Based intrinsic properties gratings filters used conjunction with interferometry, number novel have been realised. Special single mode fibre, namely, high-birefringence has employed implement dual-beam interrogating interferometer. first scheme is based channel monitor, which integral photo-detectors providing amplified electrical outputs. It interrogate Using polarisation maintainability high-birefringent interferometer realised by winding length around piezoelectric modulator generating low-frequency carrier signal. system both Finally, gratings. device generate very high frequency signal at output