ENERGY SOLUTIONS
ASN OPENS A NEW ERA IN SUBSEA INTELLIGENT SENSING BASED ON ADVANCED DAS TECHNOLOGY
Access to a single optical fibre in a subsea cable can provide :
– Protection of subsea cables and infrastructure
– Seismic measurements and recording of seismic events
– Monitoring of oceanographic conditions
The OptoDAS interrogator is using a unique interrogation technique providing low-noise and long-range quantitative phase measurements in single mode optical fibers.
OPTODAS
Real-time distortion free measurements of fibre strain modulation over distances in excess of 125 km by having one-way loss budget of more than 25 dB
- Extremely low inherent phase noise for fibre lenghts up to 10 – 20 km
- No practical impact from connector reflections
- Configurable gauge length with spatial sampling of 1 m
- The unit can be delivered for permanent installation in a 19″ rack or packaged as a portable unit
- A dedicated software suite provides extensive functionality and flexibility for instrument control, data management, processing and display
If a section of the optical fibre is subjected to strain, the propagating light will experience an optical phase delay.
By analyzing the back-reflected signal, one can extract the optical phase modulations induced along the optical fibre. This is done with a coherent OTDR technique where the phase between two adjacent scattering regions is taken to be proportional to strain. The distance between the centers of the two scattering regions is known as the gauge length.
Any measure impacting the cable strain condition can, in principle, be recorded.