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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.
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Stuart A. Kingsley (1978) studied this question.
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