Augousti, A, Maletras, F,-X and Mason, J (2005) Improved fibre optic respiratory monitoring using a figure of eight fiber optic coil. Physiological Measurement, 26(5), pp. 585-590. ISSN (print) 0967-3334

Abstract

The macro-bending loss effect in optical fibres has been used to redevelop a sensor for the measurement of thoracic and abdominal circumferences in non-invasive respiratory monitoring. The new sensor uses a novel figure-of-eight loop configuration, which results in increased linearity of response, less mechanical resistance and hysteresis, as well as other benefits. The performance of the new sensor as applied to respiratory monitoring is examined, and indicates a higher resolution and sensitivity than the old. This enhanced performance enables measurement of respiratory and cardiac function using the same transducing fibre.

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