Development of a wireless, multifunctional sensor system for the acquisition of process parameters during the manufacture of composites.

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The process control for the manufacture of composites imposes great challenges due to the complex interrelations between part geometry and reaction kinetics. Although it is possible to monitor the cure of thermosetting resins in certain specimens, this knowledge cannot easily be transferred to real-life parts and structures. Therefore it is crucial to obtain reliable real-time data to be able to control the process based on the advancement of the cure of the thermoset.One example of state-of-the-art measurement systems for determining the cure of such resins is the use of dielectric sensors. Unfortunately the application of such sensors is strongly limited due to the fact that they are cabled. The goal of this research project is to develop a wireless sensor system that allows the on-line monitoring of the cure degree and the reaction temperature and has a minimal impact on the properties of the final part. For this the relevant data shall be obtained by a novel combination of a microwave resonator (electric properties) and a quartz crystal (temperature), which uses backscatter transponder technology. The power supply will be realised via electro-magnetic coupling. This setup avoids current restrictions imposed by cable routeing and weak spots due to cable penetration. Hence it will allow for greatly improving the quality of composite parts manufactured with state-of-the-art production techniques.