Optical Sensing Systems For Structural Health Monitoring

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MOS is shortlisted in the category *Product and Innovation Award* in the Ground Engineering Awards 2016 for our works at Crossrail's Farringdon Station

FBG Pavement Monitoring Applications

MOS GFRC Sensor Cables are designed to be embedded into pavements to monitor for changes in strain. The MOS sensor cable consists of an FBG array encapsulated in a small diameter fibreglass cable with a circular section. This protects the fibre and makes the sensor robust and easy to handle and install. The FBG will convert any strain change on the cable at its location to a change in wavelength which can be acquired using an optical interrogation system. The cables can be embedded in concrete and asphalt either directly or by retrofitting using a saw-cut and epoxy.

Highway Pavements

MOS installed their FBG GFRC sensor cables into each shoulder of a section of the Hume Highway in NSW to monitor for strains induced by longwall mine-induced subsidence. FBGs were embedded into the shoulder every 10m, with a strain FBG and a temperature FBG at each sensing location. The FBGs were installed in four seperate installations, with the first installation in 2008, and the last installation in 2016. The total number of FBGs embedded is 1,570, making it one of the largest FBG installations in the world. The sensors have successfully monitored pavement strain to ensure the integrity of the highway.
For more information on this application, see this paper or contact us.

Airport Runways

MOS has experience with two airport projects. The first was a test with the FAA in America to understand the survivability of the MOS GFRC sensor cable when it was embedded directly into asphalt, and also to understand the sensor cable's performance when retrofitted into a concrete slab and subject to impact tests. The second was the retrofitting of an Italian airport runway to monitor for the passage of different types of aircrafts. In each case the FBG sensor cables were successfully embedded into the pavement and the FBGs were successful in the detection of aircraft, with different strain signatures being observed for different aircraft types.
For more information on the FAA case, refer to this case study, for more information on the Italian runway case, refer to this case study or contact us for more information.
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