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Journal of Sensors
Volume 2008 (2008), Article ID 321065, 5 pages
http://dx.doi.org/10.1155/2008/321065
Research Article

Miniaturised Optical Fibre Sensor for Dew Detection Inside Organ Pipes

1“Nello Carrara” Institute of Applied Physics, CNR, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Italy
2Cecchi srl, Viadotto Indiano, 50142 Firenze, Italy
3Institute of Atmospheric Sciences and Climate, CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
4Goteborg Organ Art Center, Goteborg University, 25-Ebbe Lieberathsgatan, 41265 Göteborg, Sweden

Received 22 May 2008; Accepted 25 July 2008

Academic Editor: Andrea Cusano

Copyright © 2008 Francesco Baldini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A new optical sensor for the continuous monitoring of the dew formation inside organ pipes was designed. This aspect is particularly critical for the conservation of organs in unheated churches since the dew formation or the condensation on the pipe surfaces can contribute to many kinds of physical and chemical disruptive mechanisms. The working principle is based on the change in the reflectivity which is observed on the surface of the fibre tip, when a water layer is formed on its distal end. Intensity changes of the order of 35% were measured, following the formation of the water layer on the distal end of a 400/430  m optical fibre. Long-term tests carried out placing the fibre tip inside the base of an in-house-made metallic foot of an organ pipe located in an external environment revealed the consistency of the proposed system.