Fibre optic sensor for physiological parameters

A fibre optic sensor structure is proposed for recovering the most relevant physiological parameters aiming at identifying the different sleep phases. The device comprises a multimode loss fibre optic sensor built into a watch casing. The sensor structure generates micro-deformations and allows a sensor to be made which is sensitive enough to detect the composite signal from the patient's wrist     

Refractive-index modifications of some polymeric materials by ion beams

Optical guides are realized by ion irradiation in three polymers: polycarbonate, HIRI, and CR39. Optical properties (index variation, loss) are compared. CR39 waveguides present the best performances (with losses as low as 1 dB/cm); the influence of a curing parameter (initiator concentration), which is directly related to CR39 density and refractive index, is studied.