FOSA Case Studies & Papers
Fiber optic sensing examples and technical papers.
We attach a Distributed Acoustic Sensing (DAS) system to an existing telecom fiber that follows the Red Line of the City of Calgary Light Rail Transit (LRT). The City does not have a Global Positioning Satellite (GPS) system to track the position of trains on the Red Line, and very few trains in the fleet are even GPS equipped. Therefore, we propose DAS tracking as an alternative to the retrofit and development of a GPS-based system or as a companion to a future system....With the Kalman DAS-distances and Kalman GPS-positions on the same dense-grid, we now have an optimal relationship that is time independent. For as long as the fiber and the Red Line themselves remain stationary, all DAS distances obtained from tracking future trains defines unique latitude and longitude positions in realtime.