Distributed Fiber Optic Sensing, DTS & DAS Systems

HERTZINNO fiber optic sensing products cover distributed acoustic sensing, distributed temperature sensing and high-fidelity well logging systems for pipelines, power cables, tunnels, perimeter security and oil & gas applications.

Acoustic Sensing

HZ-iDAS-50 Series

Distributed acoustic sensing for vibration, intrusion, leak noise and long-distance route security.

Range: Up to 50 km
Technology: Coherent Rayleigh scattering
Application: Pipeline security, perimeter protection and route monitoring

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Temperature Sensing

HZ-DTS-1004 Series

High-precision linear heat detection and real-time online monitoring for critical thermal assets.

Range: 12 km per channel
Technology: Raman OTDR
Application: Power cables, tunnels, energy storage and industrial fire risk monitoring

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Well Logging

FS-5100 System

High-fidelity long-range DAS system designed for oil & gas well logging and reservoir monitoring.

Fidelity: High-resolution subsurface acoustic response
Range: 50 km single channel
Application: Reservoir analysis, production profiling and well integrity monitoring

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Core Detection Principles

How optical fiber becomes an intelligent distributed sensor

HERTZINNO uses light scattering physics to turn standard optical fiber into a long-distance sensing medium for vibration, acoustic events, temperature changes and asset safety monitoring.

Vibration & Sound

DAS: Elastic Rayleigh Scattering

Distributed Acoustic Sensing relies on coherent Rayleigh scattering. When external vibration or acoustic events such as digging, footsteps, vehicle movement or leak noise act on the fiber, they create tiny changes in the optical path and phase of the backscattered light.

By analyzing these elastic scattering signals along the fiber, the system can reconstruct vibration events and locate them over long distances.

Physics: Elastic scattering, photon energy conserved
Target: Vibration, acoustic waves, strain and intrusion events
Applications: Pipeline security, perimeter protection, leak noise and PIG tracking

DAS elastic Rayleigh scattering principle diagram

DTS Raman inelastic scattering principle diagram

Heat & Thermal

DTS: Inelastic Raman Scattering

Distributed Temperature Sensing uses Raman scattering. Unlike elastic scattering, Raman scattering is an inelastic interaction where photons exchange energy with the fiber molecules.

The backscattered signal contains Stokes and Anti-Stokes components. Because the Anti-Stokes signal is highly temperature-sensitive, the system calculates the temperature profile along the fiber by comparing the signal ratio at each location.

Physics: Inelastic scattering, photon energy changes
Target: Temperature, hotspots, fire risk and thermal anomalies
Applications: Power cable monitoring, tunnels, fire alarms and pipeline thermal monitoring

How to Choose by Application

Power Cables and Cable tunnels

Recommended: HZ-DTS
Reason: continuous temperature monitoring, thermal hotspots and fire-risk routes.

Oil & Gas Pipelines

Recommended: HZ-iDAS + HZ-DTS
Reason: DAS detects third-party interference and leak noise; DTS detects thermal leakage patterns.

Data Centers

Recommended: HZ-DTS
Reason: cable corridors, liquid cooling routes and thermal risk monitoring.

Perimeter and Route Security

Recommended: HZ-iDAS
Reason: vibration, footsteps, digging, vehicle movement and route disturbance.

Distributed Fiber Optic Sensing FAQ

Common questions about DTS, DAS, fiber optic temperature sensing and distributed acoustic sensing.

What is distributed fiber optic sensing?

Distributed fiber optic sensing uses optical fiber as a continuous sensing medium. Instead of placing sensors only at fixed points, the fiber itself becomes a long sensing line for temperature, vibration or acoustic events.

What is the difference between DTS and DAS?

DTS measures temperature changes along the fiber route, while DAS detects vibration and acoustic events. DTS is typically used for cable temperature, hotspots and fire risk. DAS is typically used for intrusion, digging, leak noise and route disturbance.

When should I choose DTS?

Choose DTS when the monitoring target creates temperature change, such as power cable overheating, tunnel fire risk, pipeline thermal leakage, tank temperature change or data center cable temperature rise.

When should I choose DAS?

Choose DAS when the monitoring target creates vibration or acoustic energy, such as digging, vehicle movement, footsteps, pipeline interference, leak noise or perimeter intrusion.

Can DTS and DAS be used together?

Yes. Many long-distance assets benefit from both systems. DTS provides temperature visibility, while DAS provides vibration and disturbance awareness. Together they support more complete route-level monitoring.

Which HERTZINNO products are recommended for fiber sensing?

HZ-DTS is recommended for distributed temperature sensing. HZ-iDAS is recommended for distributed acoustic sensing. FS-5100 is recommended for oilfield DAS and well logging applications.

PRODUCTS: Acoustic Imaging Cameras; Acoustic Fingerprint Solutions; Fiber Optic Sensing

Contact Us: Greenland Mtown, No. 515, Huanke Road, Pudong District, Shanghai, China; info@hertzinno.com

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