If you need to detect:
- Heat
- Fire
- Thermal anomalies
- Hot spots
- Temperature changes
→ Consider DTS
Selecting the Right Fiber Optic Sensing Technology: A Guide to Choosing DTS, DAS, or Integrated Sensing Solutions
1. Introduction
Fiber optic sensing technologies can solve a wide range of monitoring challenges, but selecting the right sensing approach depends heavily on the application.
Different technologies are optimised for measuring different physical phenomena:
- Temperature
- Vibration and acoustics
- Strain (where applicable in some applications)
This guide focuses on selecting between Distributed Temperature Sensing (DTS), Distributed Acoustic Sensing (DAS), or a combined solution.
2. Start with the Monitoring Objective
The first question is:
What problem are you trying to solve?
If you need to detect:
- Digging
- Intrusion
- Vibration
- Mechanical disturbances
- Acoustic events
→ Consider DAS
If you need both operational and security monitoring:
→ Consider Integrated DTS + DAS
3. Technology Selection Guide
Choose DTS when the priority is:
Fire detection
Examples:
- Tunnels
- Conveyor systems
- Warehouses
- Car parks
Asset thermal monitoring
Examples:
- Power cables
- Transformers
- Solar farms
- Industrial equipment
Leak detection
Examples:
- Pipelines
- District heating systems
- Utility pipelines
Choose DAS when the priority is:
Security monitoring
Examples:
- Perimeter security
- Border protection
- Pipeline intrusion detection
Disturbance detection
Examples:
- Excavation monitoring
- Cable route protection
- Right-of-way monitoring
Distributed event monitoring
Examples:
- Infrastructure disturbance detection
- Rail and transport monitoring
- Remote asset security
Choose combined DTS + DAS when you need:
- Condition + security monitoring
- Leak detection + intrusion detection
- Fire detection + perimeter security
- Asset monitoring + disturbance detection
Examples:
- Pipelines
- Utilities
- Data centres
4. Selection Factors to Evaluate
Risk type
What risk dominates?
Thermal risk
→ DTS
Security/intrusion risk
→ DAS
Mixed risks
→ Combined
5. Example Selection Matrix
| Application | Typical fit |
|---|---|
| Tunnel fire detection | DTS |
| Power cable monitoring | DTS + DAS |
| Pipeline leak detection | DTS |
| Perimeter security | DAS |
| Pipeline intrusion detection | DAS |
| Border security | DAS |
| Data centre security + thermal monitoring | DTS + DAS |
| Utility corridors | DTS + DAS |
6. Questions to Consider During Technology Selection
A useful shortlist:
What event am I trying to detect?
Is temperature or vibration the key parameter?
Is early warning or alarm detection the objective?
Do I need operational monitoring, security monitoring, or both?
What sensing range is required?
How critical is event localisation?
What existing systems must be integrated?
What level of analytics is needed?
These questions often define the correct solution.
7. Common Selection Mistakes to Avoid
Choosing based only on hardware
Focus on application requirements, not just hardware specifications.
Treating DTS and DAS as interchangeable
They solve different problems.
Underestimating integration needs
Software, interfacing and data consolidation often matter as much as sensing hardware.
Designing for detection only
Some applications benefit far more from monitoring and predictive insight.
8. Why Combined Sensing is Growing
Many operators increasingly prefer integrated approaches because one sensing infrastructure can support multiple functions:
Safety
Integrity
Security
Operational monitoring
This improves:
Coverage
Value
Scalability
Return on investment
9. Conclusion
Selecting the right fiber optic sensing technology begins with understanding the risk to be managed.
- Choose DTS for distributed temperature monitoring
- Choose DAS for distributed disturbance and intrusion detection
- Choose Integrated DTS + DAS when both risks must be addressed
The right selection is application-driven, not technology-driven.
10. Further Information
For system design guidance, technical specifications, or application support, please contact fotas@samm.com.