About the project
This project explores the cutting-edge intersection of acoustics and photonics, enhancing acoustic emission detection using innovative optical fibre designs.
Acoustic emissions are transient stress waves generated by internal microstructural events such as cracks or fibre breakage. These emissions are critical indicators of damage in composite materials. Traditional piezoelectric ultrasound transducers are commonly used, but optical fibre sensors offer advantages including distributed sensing, lighter weight, resistance to electromagnetic interference, and ease of embedding within materials.
Despite their potential, optical fibres have underperformed in AE detection. This limitation is primarily due to challenges in the acoustic coupling between the glass fibre and the composite’s polymer matrix, which affects sensitivity and signal transmission.
This project aims to enhance AE detection sensitivity by designing innovative optical fibre structures. Initial experiments and modelling will give insight into acoustic coupling in composite structures to inform designs. Leveraging our state-of-the-art fibre fabrication facilities and existing expertise within our group, you will customize optical fibres with unique cross-sectional geometries. By modifying the internal microstructure and creating high-aspect-ratio fibres, we hypothesize that the acoustic sensitivity and coupling with composite materials can be significantly improved.
Your research will deepen the understanding of the acoustic coupling of optical fibres in composite materials and the ways in which sound propagates in these materials. These advancements could lead to more sensitive, robust, and scalable AE monitoring systems, driving significant technological progress in industries that rely on the long-term integrity of composite structures. This is increasingly crucial in aerospace applications, where the growing demand for hydrogen fuel tanks necessitates advanced monitoring for safety and performance.
