Title :
Fibredyne systems for passive or semipassive fibre-optic sensors
Author_Institution :
University College London, Department of Electronic and Electrical Engineering, London, UK
Abstract :
Fibredyne systems employ fibre-optic self-homodyne techniques for exploiting the microphonic nature of optical fibres when conveying highly coherent light. Any strain, pressure or temperature change applied to a fibre will cause phase modulation of the guided optical carrier. End reflections in single-mode and multimode optical fibres cause conversion of this phase modulation to amplitude modulation at the photodetector. We show how very simple passive and semi-passive fibre-optic sensors can be constructed using fibredyne detection of optical echoes.
Keywords :
optical fibres; optical modulation; phase modulation; amplitude modulation; fibredyne system; optical fibres; passive fibre optic sensor; phase modulation; self homodyne technique; semi passive fibre optic sensor;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19780282
