IPAS publications

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Browsing IPAS publications by Author "23rd International Conference on Optical Fibre Sensors (2 Jun 2014 - 6 Jun 2014 : Santander, Spain)"

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    Explosives sensing based on suspended core fiber coated with conjugated polymer
    (SPIE, 2014) Chu, F.; Tsiminis, G.; Spooner, N.; Monro, T.; 23rd International Conference on Optical Fibre Sensors (2 Jun 2014 - 6 Jun 2014 : Santander, Spain); LopezHiguera, J.; Jones, J.; LopezAmo, M.; Santos, J.
    Suspended core fibers with voids surrounding the core coated with conjugate polymer were used to detect nitroaromatic explosives based on the fluorescence quenching technique. The background Raman signal from a suspended core fiber was used as reference to optimize coupled into the core of the fiber. The fluorescence spectra were integrated across all wavelengths to extract the integrated fluorescence intensity at regular time intervals. Fluorescence decay lifetimes were obtained by fitting a single exponential decay and were used to detect 1,4-dinitrobenzene (DNB), a member of the nitroaromatics family of explosives, in acetone solutions at concentrations as low as 6.3 ppm.
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    Fibre-optic photochemical stroke: generating and measuring photochemical changes inside the brain
    (SPIE, 2014) Tsiminis, G.; Klarić, T.; Schartner, E.; Warren-Smith, S.; Lewis, M.; Koblar, S.; Monro, T.; 23rd International Conference on Optical Fibre Sensors (2 Jun 2014 - 6 Jun 2014 : Santander, Spain); LopezHiguera, J.; Jones, J.; LopezAmo, M.; Santos, J.
    We report here on the development of a method to induce a stroke in a specific location within a mouse brain through the use of an optical fibre. By capturing the emitted fluorescence signal generated using the same fibre it is then possible to monitor photochemical changes within the brain in real-time, potentially reducing the requirement for post-operative histology to determine if a stroke has successfully been induced within the animal
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    Interferometric fiber sensor using exposed core microstructured optical fiber for refractive index based biochemical sensing
    (SPIE, 2014) Nguyen, L.; Warren-Smith, S.; Cooper, A.; Monro, T.; 23rd International Conference on Optical Fibre Sensors (2 Jun 2014 - 6 Jun 2014 : Santander, Spain); LopezHiguera, J.; Jones, J.; LopezAmo, M.; Santos, J.
    We proposed and experimentally demonstrated an in-fiber interferometric-type sensor by splicing an exposed core microstructured optical fiber (ECF) with lead-in and lead-out single mode fibers (SMFs) for refractive index-based biochemical sensing applications. Due to the multimode characteristic of the ECF, several modes can be excited at the lead-in splicing point and, after propagating through the ECF section, arrive at the lead-out splicing point with different phases forming a multi-arm interference pattern in the transmission spectrum of the device. Two dominant modes were found be consistently excited by maximizing the butt coupling between ECF and SMFs. The interference fringes shifts differently upon applying liquids of different refractive index on the exposed side of the EC.
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    Sensitivity improvements of exposed-core microstructured optical fibre Bragg grating refractive index sensors
    (SPIE, 2014) Warren-Smith, S.; Monro, T.; 23rd International Conference on Optical Fibre Sensors (2 Jun 2014 - 6 Jun 2014 : Santander, Spain); LopezHiguera, J.; Jones, J.; LopezAmo, M.; Santos, J.
    G. Tsiminis andFemtosecond laser written Bragg gratings have been written in various exposed-core microstructured optical fibres (ECMOFs) for the first time. The EC-MOFs have different core diameters ranging from 2.7 micrometers to 12.5 micrometers and offer different degrees of core access depending on application requirements. Writing a Bragg grating on an open core fibre allows for refractive index based sensing, with a view to multiplexed biosensing. Smaller core fibres are shown both experimentally and theoretically to provide a higher sensitivity, with experimental sensitivities demonstrated up to 6.4 nm/RIU over the refractive index range from 1.333 (water) to 1.377 (isopropanolexperiments).