A multipoint quasi-distributed optical fiber pH sensor |
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Authors: | Michael Campbell Yatao Yang Peter A. Wallace A. Sheila Holmes-Smith |
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Affiliation: | 1. Department of Physical Sciences, Glasgow Caledonian University, Cowcaddens Road, G4 OBA, Glasgow, UK
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Abstract: | This paper reports the development and characterisation of a multipoint quasi-distributed optical fiber sensor for pH measurement. The system is based on a 170 m length of 200 μm core diameter plastic cladding silica fiber where sections of cladding have been removed and replaced with dye immobilised sol-gel glass to form sensing points. Evanescent wave excitation of a dye, immobilised within 2 mm long sections of cladding, enables the pH value of any spillage material to be determined by optical time domain reflectometry along the length of the fiber. The results suggest a spatial resolution of better than 2.5 meters for this fiber system and indicate that this arrangement could form the basis of a practical sensor/actuator system for chemical spillage, provided that suitable dye/analyte combinations are available. |
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