Abstract
The force/pressure induced birefringence in an ordinary single mode optical fibre has been investigated as a possible element for a differential pressure flow sensor. The relative sensitivities of coated and uncoated fibres at various temperatures have been measured using polarimetric interferometry. The sensitivity of an uncoated sensing fibre was found to be increased by 18% over that of the coated fibre. Results are presented showing good linearity and acceptable stability in measurements over the temperature range 20°C to 95°C, and application to flow sensing are discussed.
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