SENSING SOLUTIONS
CANNARA BRIDGE
Client
We provided a multi-purpose solution in one cable to secure the Cannara Bridge. Our cable included Distributed Acoustic Sensing, Distributed Temperature Sensing, and Structural Health Monitoring to measure strain,
15
NBG Group Experience
40
Countries
65
Structural Health Projects
12k
NBG Group Sensor Build
Introduction
Due to the steep topography of the region, the bridge was built along the coast on artificial land in 1944. In 1979, the collapse of a seawall on the edge of the landing tracks triggered an underwater landslide/tsunami. Fiber optic sensing is the best safety measure to monitor the land for critical coast movement and subsidence.
The Project
The reclaimed land on the Var River Delta was experiencing subsidence and freshwater circulation. We were hired to deliver a method of measuring the strain and movements of the land, and the temperature and acoustics of the freshwater.
Our Trisens cable was the perfect response. It’s an extremely small cable built for multi-purpose sensing applications. The optical fibers are protected by a stainless-steel tube and hermetically sealed. Trisens is built to perform and thrive in environmentally demanding situations.
Key Challenges
- Integration of distributed temperature, strain and acoustic sensing in one cable solution.
- Simple handling and burying of just one single fiber optic cable into the seabed.
- Keep the installation process and costs as low as possible.
- Provide a long-term monitoring solution.
Our Solution
- We buried the Trisens cable 20m beneath the seabed to accurately measure the strain, movement, temperature, and acoustics of the land.
- The triple tube construction of the Trisens cable enables it to measure additional temperature ranges while offering optimal fiber protection.
Fiber Optic Sensors Used
Sonosens
LightDelta is a single-mode optical fiber with a low water peak and a reduced sensitivity to bends. We make it by the Vapor Axial Deposition method (VAD).
Trisens
LightDelta is a single-mode optical fiber with a low water peak and a reduced sensitivity to bends. We make it by the Vapor Axial Deposition method (VAD).
Point Sensing Technology
The reclaimed land on the Var River delta was experiencing subsidence and freshwater circulation. We were hired to deliver a method of measuring the strain and movements of the land, and the temperature and acoustics of the freshwater.
- Monitor well defined points
- Sensors for strain, temperature, tilt, acceleration, displacement, etc.
- Up to 40 multiplexed sensors per channel
- Fiber Bragg Grating Technology up to 16 channels on one interrogation unit
What our partners say
Whenever we team up with NBG on a project, we can depend on them being professional, fast, and high-quality. They always take the time to understand the full-scope of every project even when their deliverables only require partial involvement.
Anthony Smith CEO at AP sensing
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