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Building Stone Condition Monitoring Using Specially Designed Compensated Optical Fiber Humidity Sensors

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6 Author(s)
Tong Sun ; Sch. of Eng. & Math. Sci., City Univ. London, London, UK ; Grattan, K.T.V. ; Srinivasan, S. ; Basheer, P.A.M.
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This paper presents the design and implementation of a novel optical fiber temperature compensated relative humidity (RH) sensor device, based on fiber Bragg gratings (FBGs) and developed specifically for monitoring water ingress leading to the deterioration of building stone. The performance of the sensor thus created, together with that of conventional sensors, was first assessed in the laboratory where they were characterized under experimental conditions of controlled wetting and drying cycles of limestone blocks, before being employed “in-the-field” to monitor actual building stone in a specially built wall. Although a new construction, this was built specifically using conservation methods similar to those employed in past centuries, to allow an accurate simulation of processes occurring with wetting and drying in the historic walls in the University of Oxford.

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Sensors Journal, IEEE  (Volume:12 ,  Issue: 5 )