University of Southampton
Distributed Optical Fibre Sensing and the National
Infrastructure Laboratory
High-resolution distributed acoustic sensor (HR-DAS) is a
new sensing technology that uses a single strand of optical fibre to map the
strain distribution along any structure with unprecedented strain accuracy.
With a diameter of 250 μm, the optical fibre can easily be attached to or
integrated inside any structure to provide a detailed map of structure
behaviour every 10 cm at thousands of points. Hence, HR-DAS represents a
practical embodiment of a finite element analysis model that can be used to characterise
large civil structures such as bridges and rail tracks.
HR-DAS is being used to develop a smart composite bridge
beam, which will be tested in the National Infrastructure Laboratory in April
2024. There is an extremely wide range of potential applications for this
technology.