A novel fibre optic sensor of relative humidity for application in cultural heritage

Rosaria D Amato, Michele Arturo Caponero, Barbara Palazzo, Gaetano Terranova, Andrea Polimadei

Abstract

In this work we present a novel relative humidity sensor of low invasiveness and visibility, well suited for applications in cultural heritage and in particular to monitor the moisture content in stone and wooden artworks. The sensor is based on fibre optic technology, produced by depositing a thin coating of a hygroscopic material on a thin and transparent, barely visible, fibre optic. The novelty of the projected sensor is in the proposed hygroscopic material, which is a mixture of Agar and Chitosan. This material overcomes the critical issues of sensors previously described, based on the same technology but produced with different polymers, typically pure Agar. We present results of the tests that proved the effectiveness of the proposed material and the results of long term measurements in the field.

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IMEKO-TC4-METROARCHAEO-2019-59.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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