Development of FBG humidity sensors for stone condition monitoring

Michele Caponero, Rosaria D'Amato, Andrea Polimadei, Gaetano Terranova

Abstract

Novel relative humidity (RH) sensors, based on fibre Bragg gratings (FBGs) technology, have been fabricated using different moisture-sensitive materials, namely agar, poly(vinylalcohol) and poly(ethyleneoxide), on the fiber sensor. The sensor is specifically intended to monitor stones of cultural heritage buildings and monuments, in particular for being positionedunder hydrophobic coatings used for protecting stones from absorption of water and dissolved chemicals, thus providing early warning of coating deterioration by RH monitoring. The feature of the prototypes was first tested exposing the sensors in controlled environment and then assessed by simulated 'in-the-field' operating conditions, with sensors installed in a marble block. Experimental results are presented and discussed.

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IMEKO-TC4-ARCHAEO-2017-085.pdf

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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