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Jinan Jiahong Technology Co., Ltd
Jinan Jiahong Technology Co., Ltd
This technology utilizes the Raman scattering effect in optical fibers combined with Optical Time-Domain Reflectometry (OTDR) to achieve both temperature sensing and spatial localization. A high-speed, narrow-pulse-width laser is injected into the sensing fiber. The backscattered signal is then collected and analyzed to extract the temperature-sensitive Anti-Stokes component and the temperature-insensitive Stokes component. By calculating the ratio of these two signals, absolute temperature measurement is achieved, enabling real-time and accurate temperature monitoring along the entire length of the fiber.
Functional Features
① Continuous Full-Area Monitoring with Zero Blind Spots
This system enables continuous, real-time temperature measurement along the entire optical fiber path, achieving truly uninterrupted, comprehensive, and gap-free monitoring. It significantly enhances the capability to ensure safety across large-scale, long-distance infrastructure.
② Intrinsically Safe and Adaptable to Complex Environments
The sensing fiber is constructed from quartz material, offering intrinsic safety: it contains no electronic components, produces no electrical sparks, and resists electromagnetic interference. This makes it inherently suitable for hazardous environments—such as petrochemical plants, coal mines, and battery energy storage systems (BESS)—where flammable, explosive, or high electromagnetic interference conditions are present.
③ Excellent Positioning and Temperature Measurement Performance
High-Precision Positioning: Utilizing Optical Time-Domain Reflectometry (OTDR) technology, the system achieves high spatial positioning accuracy with a resolution of up to ±0.5 meters, enabling rapid and precise localization of abnormal temperature points.
④ High-Precision Temperature Measurement:
With a temperature accuracy of ±1 ℃ and a resolution of 0.1 ℃, the system can sensitively detect and distinguish subtle temperature variations, enabling early warning capabilities.
⑤ Ultra-Long Distance Monitoring: Efficient and Economical
A single-channel measurement distance of up to 10 kilometers significantly reduces monitoring blind spots and hardware investment. One system can cover extensive areas such as tunnels, utility corridors, and cable passages, resulting in low monitoring cost per unit distance.
①Intelligent Multi-Level Alarm and Warning Mechanism:
The system supports flexible configuration of multi-level alarm thresholds, enabling customized temperature alarm values tailored to specific protection zones or equipment types. Beyond standard over-temperature alerts, it incorporates advanced functions such as differential temperature alarms (comparing temperature variations between adjacent zones) and temperature rise rate alarms (detecting rapid temperature increases to facilitate ultra-early fire warnings). Additionally, it can activate relay outputs to initiate emergency protocols including ventilation and fire suppression systems.
⑦ High Reliability and Long Service Life
The optical components of the system feature extended durability with no moving parts and high corrosion resistance, ensuring stable and reliable performance. Designed for industrial applications requiring 24/7 continuous operation, the system demands minimal maintenance and offers significant advantages in lifecycle cost efficiency.
⑧ Robust System Integration and Data Management Capabilities
Equipped with standard communication interfaces (e.g., optical port, Ethernet port) and protocols (such as Modbus TCP/IP), the system seamlessly integrates with existing DCS, SCADA, IoT cloud platforms, and intelligent fire protection systems. It supports the division of long-distance optical fibers into hundreds of independent logical segments for precise monitoring and management. Additionally, the system offers high-capacity historical data storage, temperature trend review, and event logging functions, enabling comprehensive traceability and post-incident analysis.
Technical parameters
Channels & Distance:
Supports 8 or 4 independent temperature measurement channels.
Maximum measurement distance per channel: 10 km.
Temperature Measurement Performance:
Range: –20 °C to 120 °C (depending on fiber cable temperature resistance)
Accuracy: ±1 °C | Resolution: 0.1 °C
Positioning Capability:
Spatial positioning accuracy: ±1 m (within 10 km)
Resolution: ±0.5 m
Sensing Fiber Cable:
62.5/125 μm graded-index multimode fiber
Power Supply & Explosion Protection:
Intrinsically safe power supply
Rated voltage: 12 V
Wide input voltage range: DC 9–26 V
Communication Interfaces:
2 optical ports + 2 electrical ports (RJ45)
Supports Modbus TCP protocol
Alarm & Output Functions:
8-channel normally open relay output
Over-limit, temperature rise rate, and fiber break alarms
Zoning & Display:
Supports up to 125 zones
Monitors maximum and average temperatures
Equipped with a 7-inch color LCD display
Data Storage: Built-in 16GB memory for historical curves and event logging
Enclosure & Protection:
IP67 protection rating
Dimensions: 450mm × 350mm × 116mm
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