Infrastructure doesn’t fail overnight. Mines, pipelines, tailings dams, and other critical assets are exposed to constant stress for weeks, months, or even years before visible signs of damage begin to appear. And to detect these signs of failure, traditional monitoring systems are used widely. But the problem with traditional monitoring systems is that they raise an alert too late. By the time an alert is triggered, the severe damage has already been done and cannot be reversed.

This is where modern strain monitoring systems become essential. These systems are designed to provide operators with real-time sensing capabilities. Unlike traditional point-based sensing, distributed strain monitoring can detect even subtle changes in structural behaviour across infrastructure, pipelines, mines, and other critical assets.

The Challenges with Traditional Strain Monitoring

Traditionally, strain monitoring relied on point-based sensors installed at locations engineers identified as potential risk areas. Conclusions were then drawn from isolated readings collected at those specific locations. While effective in certain applications, traditional strain monitoring systems have several limitations:

• Point-based sensing only detects issues at the exact location where the sensor is installed. Events occurring outside that area, even just a few metres away, may go undetected.
• Structural deformation often develops gradually. If sensors are not positioned within the affected area, early warning signs may be missed, leading to costly damage or failure.
• Even a well-designed monitoring system can contain gaps in coverage, creating blind spots that reduce the effectiveness of the overall monitoring program.
• When data is collected at intervals rather than continuously, there can be a significant delay between the onset of structural strain and the generation of an alert, increasing the risk of structural failure.

These limitations make traditional point-based monitoring systems less effective for large-scale infrastructure monitoring. Advanced distributed strain monitoring systems address many of these challenges by providing continuous visibility across an entire asset.

What is a Strain Monitoring System? (Beyond Conventional Sensors)

A strain monitoring system is designed to detect, measure, and record the physical deformation of a structure under stress. For critical infrastructure, strain monitoring serves as an early warning mechanism, identifying abnormal mechanical behaviour before it leads to failure.

Continuous, real-time monitoring allows operators to detect strain and early-stage deformation before they develop into larger structural issues. Unlike traditional systems that require multiple discrete sensors, Sintela’s distributed sensing solution uses fibre-optic cable as the sensing medium. A single system can monitor up to 200 km of infrastructure, providing complete visibility across an entire asset.

What is a Strain Gauge Monitoring System?

A strain gauge monitoring system is one of the most widely used traditional methods for measuring deformation in structures. These systems use small sensors known as strain gauges, which are attached directly to a material or structure.

When a structure experiences stress, the strain gauge deforms slightly along with it. This deformation changes the electrical resistance within the sensor, and that change is converted into strain measurements.

Strain gauge monitoring systems are effective for monitoring specific locations where stress is expected. However, because they operate using a point-based sensing approach, they only collect data from the exact locations where sensors are installed.

To increase coverage, additional sensors must be deployed throughout the asset, increasing both installation costs and system complexity. As a result, many industries are transitioning to distributed strain monitoring systems that provide continuous monitoring across entire infrastructures.

From Strain Gauges to Distributed Strain Monitoring Systems

Strain monitoring has evolved significantly as infrastructure operators require greater visibility across larger assets. To overcome the limitations of traditional methods, distributed strain monitoring systems were developed.

At Sintela, our distributed sensing solutions transform fibre-optic cable into a continuous sensing device. Instead of relying on individual sensing points, the fibre acts as a sensor along its entire length. This allows operators to monitor and measure strain across an entire asset using a single fibre-optic cable.

The difference between traditional and distributed monitoring is substantial.

Conventional Strain Gauges

Features of traditional strain monitoring systems include:

• Point-based measurements
• Limited, non-continuous coverage
• Expensive scaling requirements

Distributed Strain Sensing 

Features of Distributed Strain Sensing include:

• Continuous, real-time monitoring
• Extended coverage of up to 200 km
• Significantly higher data resolution

How Distributed Strain Monitoring Systems Work

Distributed strain monitoring systems use fibre-optic cables to continuously monitor the condition of large infrastructure assets, including tailings dams, boreholes, pipelines, and transportation corridors.

Unlike traditional monitoring systems that rely on individual sensors at specific locations, distributed sensing transforms the entire fibre-optic cable into a continuous sensor. The process begins by sending laser pulses through the fibre. When the cable experiences strain, those changes alter the light signal and are detected by the sensing system.

What makes this technology different is that measurements are not limited to a single point. Instead, data is collected continuously and in real time across the full length of the fibre. Operators can monitor kilometres of infrastructure simultaneously and identify precisely where structural changes are occurring.

Distributed strain monitoring systems can detect:

• Exact strain locations
• Deformation intensity
• Changes in strain over time
• Structural stress
• Vibrations and acoustic activity
• Temperature variations

Distributed strain monitoring systems can detect:

• Exact strain locations
• Deformation intensity
• Changes in strain over time
• Structural stress
• Vibrations and acoustic activity
• Temperature variations

Key Capabilities of Advanced Strain Monitoring Systems

Sintela’s advanced sensing solutions provide significantly greater visibility and performance than traditional strain monitoring systems.

1. Continuous, Real-Time Monitoring

One of the greatest advantages of distributed sensing is continuous real-time monitoring. Operators no longer need to rely on isolated sensor readings.

This enables infrastructure teams to:

• Observe changes as they occur
• Detect abnormalities early
• Respond before issues become irreversible

2. Low False Alarm Rates with AI

Modern strain monitoring systems use AI-driven analytics to improve data interpretation and reduce false alarms.

These systems can distinguish between meaningful structural events, environmental disturbances, and non-critical activity. This improves operational confidence while reducing unnecessary interventions.

3. Long-Range Coverage (Up to 200 km)

Distributed strain monitoring systems are designed for large-scale deployments. A single system can continuously monitor tens or even hundreds of kilometres of infrastructure.

This makes the technology ideal for:

• Pipelines
• Border corridors
• Boreholes
• Transportation networks

Large-scale monitoring becomes more practical and cost-effective when a single system can cover up to 200 km.

4. High Sensitivity (Microstrain to Picostrain Detection)

Advanced sensing systems can detect extremely small structural changes that would typically go unnoticed using traditional monitoring technologies.

These systems can identify:

• Ground movement
• Structural fatigue
• Material stress accumulation
• Slope instability

Early detection can mean the difference between routine maintenance and catastrophic failure.

5. Precise Event Localization

Advanced sensing systems can detect extremely small structural changes that would typically go unnoticed using traditional monitoring technologies.

These systems can identify:

• Ground movement
• Structural fatigue
• Material stress accumulation
• Slope instability

Early detection can mean the difference between routine maintenance and catastrophic failure.

Applications of Strain Monitoring Systems Across Industries

Distributed strain monitoring systems are now used across a wide range of industries.

Mining & Geotechnical Monitoring

Distributed sensing helps operators monitor:

• Rock mass behaviour
• Ground deformation
• Slope stability
• Tailings dam conditions

Pipeline & Infrastructure Monitoring

Distributed strain monitoring can identify:

• Leak-related stress changes
• Structural stress accumulation
• Ground movement near pipelines
• Potential failure zones

Transportation Networks

Monitoring systems help operators:

• Detect track deformation
• Identify structural stress
• Improve maintenance planning
• Reduce safety risks

Energy & Utilities

Distributed sensing is widely used for:

• Powerline monitoring
• Subsea cable monitoring
• Utility corridor protection
• Remote infrastructure management

How Distributed Strain Monitoring Differ From Strain Gauge Systems

 

Feature	Strain Gauge Monitoring System	Distributed Strain Monitoring System
Coverage	It offers point-based coverage	It offers continuous coverage in real-time
Detection	Localized, meaning it covers where the instrument is deployed	It covers full-length, such as at Sintela, where we offer detection up to 200 km.
Installation	Complex scaling, as it needs to be attached using adhesives.	It uses existing fiber, turning it into a sensing system.
Maintenance	Higher sensor management	Centralized monitoring
Fiber Infrastructure	Dedicated sensor hardware required	Compatible with existing fiber
False Alarm Management	Manual threshold setting	AI-driven event classification
Data Quality	Limited	High resolution

 

Key Features to Look for in a Strain Monitoring System

Choosing the right strain monitoring system involves more than comparing technologies. The system should align with your operational requirements, infrastructure characteristics, and long-term monitoring goals.

• Sensitivity & Accuracy: The system you are choosing must be reliable with both small and large structural changes and should offer accurate results. 

• Scalability: Infrastructure never stays the same but changes over time. The monitoring system should be capable of expanding without requiring a major redesign. 

• Real-Time Alerts: The monitoring system should be capable of presenting real-time alerts that are essential for high-risk environments. 

• Integration With Existing Infrastructure: Strain monitoring systems that work with existing fiber networks can reduce the deployment costs significantly. 

• Remote Monitoring Capability: Monitoring systems with centralized dashboards and remote access often improve operational efficiency and decision-making. 

Deployment & Integration Approach

Implementing a distributed strain monitoring system involves more than simply installing hardware. The process must be carefully planned to ensure accurate measurements, seamless integration with existing infrastructure, and reliable long-term performance.

Each phase of deployment contributes to the creation of an effective monitoring network.

Site Assessment

The first step is understanding the site and identifying the assets and conditions that need to be monitored.

Sintela’s engineers evaluate the infrastructure, surrounding environment, and potential risk areas before deployment begins. This assessment helps determine:

• Which areas are most vulnerable to stress or deformation
• What type of monitoring is required
• How the sensing infrastructure should be deployed

A thorough site assessment is critical because every project has unique requirements. The monitoring strategy for a tailings dam, for example, differs significantly from that of a mining operation, pipeline, or transportation corridor.

Fiber utilization

One of the key advantages of distributed sensing is that the fibre-optic cable itself acts as the sensor.

Instead of installing thousands of individual sensors throughout an asset, the system uses fibre-optic cable to provide continuous monitoring along its entire length.

Depending on project requirements, organizations may:

• Use existing telecom or dark fibre
• Install new fibre-optic cable
• Combine communications and sensing within a single network

This approach makes deployment more efficient and scalable, particularly for long-distance assets such as pipelines, roads, railways, and boreholes.

As the asset experiences strain, vibration, or temperature changes, the fibre detects these events and transmits the data to the monitoring system in real time.  

System Configuration

Once the fibre is installed or connected, the monitoring platform is configured to meet the project’s specific requirements.

This includes:

• Monitoring sensitivity settings
• Alert thresholds
• Data collection parameters
• Event detection criteria

The system is configured to ensure the collected data remains accurate, relevant, and actionable.

Modern distributed sensing systems also incorporate:

• AI-based event classification
• Noise filtering
• Automated alerts
• Remote monitoring capabilities

These features help operators identify meaningful events quickly without manually reviewing large volumes of raw data.

Data Visualization Dashboards

Once operational, monitoring data is presented through intuitive dashboards that provide a clear overview of infrastructure conditions.

These dashboards enable operators to monitor:

• Real-time strain activity
• Event locations
• Changes over time
• Alert notifications
• Overall system performance

Rather than interpreting complex raw datasets, operators can quickly understand what is happening across the asset and make informed decisions.

Dashboards can display:

• Exact event locations
• Event severity
• Trend progression over time
• Automated reports
• Interactive maps
• Historical trend analysis

This enables faster maintenance planning, improved operational awareness, and more informed engineering decisions.

Why Choose Sintela for Strain Monitoring System

Sintela specializes in quantitative distributed fibre-optic sensing solutions designed to provide continuous infrastructure intelligence.

Our focus goes beyond simply detecting disturbances. We deliver systems capable of providing accurate measurements, high-resolution sensing, and scalable deployments across a wide range of applications.

Organizations worldwide choose Sintela because of our:

• Quantitative DFOS technology
• Proven large-scale deployments
• Compatibility with existing fibre infrastructure
• Low-power, scalable architecture
• Industry-grade reliability

Sintela’s ONYX™ platform combines quantitative distributed sensing, AI-powered analytics, long-range coverage, and compatibility with existing fibre-optic infrastructure, making it an ideal solution for strain monitoring applications.

To learn how a distributed strain monitoring system can be configured to meet your operational requirements, contact Sintela. Our team can help you evaluate your monitoring objectives and determine how the ONYX™ platform can support your infrastructure monitoring strategy.

Frequently Asked Questions (FAQs) 

What is strain monitoring used for?

Strain monitoring is used to detect deformation or stress within structures and assets. It helps engineers identify instability, material fatigue, and early warning signs of failure before significant damage occurs

How is distributed strain monitoring different from strain gauges?

Strain monitoring is used to detect deformation or stress within structures and assets. It helps engineers identify instability, material fatigue, and early warning signs of failure before significant damage occurs.

Can distributed strain monitoring systems monitor large infrastructure?

Yes. Distributed strain monitoring systems are specifically designed for large-scale infrastructure assets such as pipelines, railways, tunnels, power networks, tailings dams, and transportation corridors. A single system can monitor distances of up to 200 km.

How accurate is distributed sensing?

Advanced distributed sensing systems, such as Sintela’s ONYX™ platform, can detect extremely small strain changes with high spatial resolution and real-time accuracy. This sensitivity enables operators to identify developing issues before they escalate into significant structural problems.