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.
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.