Quasi-distributed pressure sensors with composite structural integration

Important results from the project

The aim of the project was to develop quasi-distributed pressure sensors embedded in composite structures. Fibre Brag Grating (FBG) optical fibers and carbon nanotubes embedded in composite laminates were used as sensors. The goal of the project was to integrate compact and robust sensors/sensor materials that could be used to measure pressures in the range of 10 to 200 kPa. The objective of the project was met and evaluated through demonstration at the laminate level and in wind tunnel tests.

Expected long term effects

Incorporating additional functions into structural materials creates multifunctionality, which offers potential for significant weight savings at an overall system level since both structure and system functionality can be built as a load-bearing component. The area of structural health monitoring within multifunctional structures has already resulted in international collaborations. These can eventually develop the technology itself to give it further technological maturity.

Approach and implementation

WP1 developed a coated optical fiber at RISE that could measure pressure. WP2 KTH worked on resistive carbon nanotube-based sensors. WP3 conducted joint experiments between KTH and RISE to compare sensor technologies. WP4 defined requirements, tested and updated the software of the Saab-developed interrogator. WP5 Saab and Elitkomposit worked with coupon samples, laminate-level samples and the final demonstrator. WP6 conducted wind tunnel testing of the final demonstrator.