Fibre optic monitoring is used to measure strain, temperature, vibration, and ground movement across infrastructure, geotechnical, and environmental sites.  It provides continuous, real-time data along the entire length of the fibre, making it ideal for slope stability, embankments, tunnels, retaining walls, foundations, and utility corridors.

It works by sending pulses of light down a fibre optic cable.  When the fibre experiences changes in strain, temperature or vibration, it alters the light signal.  These changes are picked up and analysed using technologies such as Distributed Temperature Sensing (DTS), Distributed Strain Sensing (DSS), and Distributed Acoustic Sensing (DAS).

Unlike traditional sensors that measure only at fixed points, fibre optics give distributed data across the entire cable length.  This enables high-resolution monitoring over hundreds or even thousands of metres.  It also means fewer components, lower maintenance, and better performance in harsh or remote environments.

Common applications include:

•  Slope stability and landslide detection
• Settlement and heave in structures and ground
• Tunnel and retaining wall deformation
• Pipeline and utility corridor monitoring
• Geothermal or ground temperature measurement
• Structural health monitoring on bridges and dams

Yes; Igne regularly installs fibre optic cables in boreholes to monitor deep ground behaviour.  This provides vertical profiles of temperature or strain that are critical for understanding subsurface performance and movement.

Cables can be installed to depths exceeding 100m, depending on project needs.  Igne uses rotary or sonic drilling to reach target zones and ensures the correct backfill or grouting is applied for accurate sensing and long-term durability.

Installation typically involves:

• Specialist drilling (if monitoring below ground)
• Placement of the fibre optic cable in boreholes, trenches or structures
• Proper backfill to ensure sensitivity and protection
• Connection to an interrogation unit or data logger
• Integration with software for data analysis and remote access

We manage the full installation process, ensuring the system is configured for performance from day one

Absolutely.  Fibre optic cables can be installed alongside piezometers, inclinometers, seismic sensors, or vibrating wire instruments in the same borehole or trench.  This gives a comprehensive view of ground behaviour and structural performance.

When installed properly, fibre optic systems can last 20 years or more.  They have no moving parts, are highly resistant to corrosion and electromagnetic interference, and require minimal maintenance.

Initial setup costs may be higher than traditional point sensors, but the long-term value is greater.  You get more data, lower maintenance, and the ability to detect problems early, reducing risk, delays and potential repair costs down the line.

Data is accessed via a central interrogation unit, which can be connected to a local server or a remote platform.  Alerts can be set up to notify stakeholders of any threshold exceedance.  The data can support compliance, design validation, real-time decision-making and long-term asset management.

Igne specialises in the drilling and installation of fibre optic cables as part of distributed monitoring systems.  We work closely with sensor manufacturers and monitoring consultants to ensure the installation matches the system requirements and delivers optimal performance.