Community Research and Development Information Service - CORDIS

Distributed environmental monitoring with optical fibres

Fibre optic sensors provide a method of reliable, passive monitoring of environmental changes for industrial and civil engineering applications. Their specific advantages are very attractive in situations with a lot of electromagnetic interference (EMI).

Intensity modulation, induced by gratings, microbending and reflections in multimode fibres is considered as a possible transduction mechanism for detecting pressure changes.

The DEMOS system is based on the 'Time and Frequency Division Multiplexing' technique, used for processing the signals of a multiple sensor system. The signals related to the separation in time, as a result of the optical delay lines, are electrically demultiplexed and can thus be implemented in a data collection system (DCS).

The major advantage of optical fibres for such a sensor system is the possibility of passive sensing, that is, sensing without the use of electrical components in the sensor head.

The long term stability of the proposed system is an essential requirement and therefore the research focuses on solving the problem of calibration, reference techniques and line neutrality from lead fibre through the sensor head.

Contact

M H-R VOET, (Managing Director)
Tel.: +32-14-581191
Fax: +32-14-591514
E-mail
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