Optical sensors embedded in composite materials

ABSTRACT The use, on the one hand, of the property that light power attenuationoccurs in a micro-deformed optical fibre, on the other hand, an other fibre orfibre themselves happensit, had introduced some new surface sensors • After a brief exam of different configurations, we consider the opportunerress to use this sensor to the measure of strain in composite material. The goal is to measure the pressure and to follow the delaminage in the composite material. A mechanical model of behaviour is introduced. 1. INTRODUCTION The pressure exerted on optical fibres cross produces a mechanical deformation, and an optical leak. The measure of the light power attenuation gives us the strengh applied on it 2 .The principle proposes to use this measure applied into integrated sensors. The sensors are introduced into composite material to - measure the pressure strain developed into the composite material - follow the behaviour in a delaminage of th composite materialThe principle of the deformation of the optical fibre is modeled by anfinit element approach. Some other methods are exposed Stass pubication3