24/7 Real-Time Without Blind Spots
Measures temperature profiles continuously along tens of kilometers of fiber cable. No risk of undetected hot spots falling between discrete sensor points.
DISTRIBUTED FIBER-OPTIC SENSING · CRITICAL INFRASTRUCTURE MONITORING
The VTI-GL-100C solution transforms the entire length of an armored optical fiber into a continuous intelligent thermal sensor. Real-time monitoring across distances up to 20 km (4 channels × 5 km), ±1 °C high accuracy, and 0.5-meter spatial resolution. Completely passive along the sensing route (0 W field power) and 100% safe in explosive and hazardous environments.
UNMATCHED ADVANTAGES
Thermal monitoring in large-scale energy and industrial assets requires 100% continuous coverage with zero blind spots, meter-level event localization, and resilience to harsh environments.
Measures temperature profiles continuously along tens of kilometers of fiber cable. No risk of undetected hot spots falling between discrete sensor points.
Accurately pinpoints the location of overheating, insulation breakdown, or fire along the cable run within 0.5 meters, enabling swift intervention and targeted maintenance.
Armored glass fiber carries light only — no electricity, no sparking hazards, and 100% immune to high-voltage electromagnetic interference in substations and transmission corridors.
Withstands severe tension, compression, and mechanical wear. Outer jacket is flame-retardant low smoke zero halogen (LSZH), rated for −40 to +120 °C operating temperatures.
Entire cable run is purely passive optical glass. No batteries, no auxiliary power supplies, and zero field maintenance required along the monitored corridor.
Built-in 10.4-inch industrial touchscreen, Modbus RTU (RS485), RJ45 Ethernet, and 16 programmable relay outputs for instant tripping and fire suppression integration.
OPERATING PRINCIPLE / RAMAN OTDR
Understanding how Raman Optical Time Domain Reflectometry (OTDR) calculates precise temperatures and locations along optical fibers.
High-frequency laser pulses are launched into the optical fiber core. As photons interact with silica molecules, backscattered light is generated containing Rayleigh, Brillouin, and Raman spectral bands:
By calculating the ratio between Anti-Stokes and Stokes intensities, absolute temperature is accurately determined regardless of fiber bending or attenuation.
| Parameter | VTI-GL-100C (DTS) | Point Sensors (RTD) |
|---|---|---|
| Coverage | 100% continuous line | Only at installed points |
| Blind spots | Zero blind spots | Blind spots between sensors |
| Field Power | 0 W (passive glass) | Requires wiring / batteries |
| EMI Immunity | 100% immune | Susceptible to EMI noise |
CRITICAL APPLICATIONS
Detect overheating, insulation breakdown, and fire hazards in underground high-voltage transmission cable tunnels and substation trenches with meter-level accuracy.
Detect product leaks, flow waxing, blockages, and abnormal temperature variations across pipeline networks spanning tens of kilometers.
Installed around tank shells, bases, and floating roofs for 3D continuous monitoring of thermal anomalies, gas leaks, and automated fire suppression interlocking.
Mounted along tunnel ceilings and utility corridors to detect fires swiftly, tracking smoke spread and guiding ventilation systems in emergencies.
Continuous thermal surveillance along coal, mineral, and clinker conveyor belts to detect roller bearing friction and prevent spontaneous ignition.
Consolidates temperature profiles into central GIS maps, analyzing historical trends, load curves, and dynamic line/cable ratings (DLR).
TECHNICAL SPECIFICATIONS
| Controller Specifications — VTI-GL-100C Controller | Technical Parameters |
|---|---|
| Optical Channels | 4 optical channels (FC/APC standard) |
| Maximum Distance per Channel | 5 km per channel · Total 20 km continuous monitoring |
| Spatial Resolution | 0.5 meters |
| Temperature Accuracy | ±1 °C (Temperature resolution: 0.1 °C) |
| Measurement Range | −40 to +120 °C (cable-dependent up to +300 °C) |
| Sampling Frequency | 3 samples / second / channel |
| Relay Outputs | 16 programmable relays (250 VAC / 3A) for fire alarms / tripping |
| Communication Interfaces | 1x RJ45 Ethernet, 1x RS485 (Modbus RTU), 1x RS232 |
| Display & Local HMI | 10.4-inch industrial touchscreen integrated into chassis |
| Power Supply / Dimensions | DC 24V, 50W · 420 × 182 × 580 mm · Operating temp: −10 to +50 °C |
| Armored Sensing Cable Specifications | Technical Parameters |
|---|---|
| Optical Fiber Core | Core 62.5 μm / Cladding 125 μm · Graded-index multi-mode / single-mode |
| Cable Outer Diameter | Φ3.0 mm armored with stainless-steel spiral & braided mesh |
| Outer Sheath Material | Flame-retardant low smoke zero halogen (LSZH), anti-static, UV-resistant |
| Tensile & Crush Resistance | Installation tension ≤500 N, operating ≤300 N · Crush resistance ≤5000 N/10cm |
| Minimum Bending Radius | ≥60 mm (dynamic), ≥30 mm (static) |
Comprehensive 25-page technical brochure containing operating principles, controller and cable engineering data, SCADA integration diagrams, and delivered project deployments.