A novel method for the design and manufacture of sensors to measure the temperature and relative humidity of the air, the pH of solutions or the refractive index of liquids based on optic fibre has been devised at the Public University of Navarre.
The sensors are small devices capable of capturing both physical and chemical signals from the surrounding environment and converting them into electrical signals for their subsequent processing. The information thus transformed can be easily quantified, manipulated and processed by electronic and computer systems which keep us constantly up-dated on any change in the environment where the device is located.
In this PhD thesis, the proposed sensors are based on the transformation of the optic fibre by a burnished area thereof. These optic fibres are of standard telecommunications monomode silica and their coating has been partially eliminated over a small area by mechanical burnishing. This perturbation on the burnished zone alters the propagation of the optic signal transmitted in the fibre, giving rise to a controllable correlation between the diminution of the optic potential of the outgoing signal and the mesurando which actuates with the signal over the said transformated zone.
Garazi Andonegi | Alphagalileo
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