The distributed optical fiber temperature measurement system is a continuously distributed optical fiber temperature sensing system for measuring temperature. It uses optical time domain reflection (OTDR) technology and Raman scattering effect to measure temperature changes distributed along the optical fiber.In this system, the optical fiber is both a transmission medium and a sensor. The laser pulse is transmitted forward along the optical fiber. The laser interacts with the optical fiber medium to produce extremely weak back-scattered Raman light (temperature-sensitive anti-stokes light and temperature-insensitive stokes light), which is separated by a wavelength division multiplexer and detected by a highly sensitive photodetector, and then through high-speed signal acquisition and weak signal processing, the light intensity ratio and return time of the back-scattered signal light are obtained, so as to obtain temperature distribution information in real time.As the most advanced linear temperature sensing detector at home and abroad, the distributed optical fiber temperature sensing system has the advantages of long measurement distance, no measurement blind spots, and real-time measurement. It is widely used in electric power, transportation tunnels, subways, petrochemical, dam and other fields.
Technical parameters | |||
Project | Unit | Content | |
Measure the distance | Km | ≤ 16 (10km/channel recommended for spatial resolution 1m, 5km/channel recommended for spatial resolution 0.5m, 20km/channel recommended for spatial resolution 3m) | |
Measurement channel | Channel | 1 ~ 16 (customizable) | |
Measure the time | s | 2s/km@0.5m spatial resolution, 1s/km @ 1m spatial resolution | |
Alarm threshold | ℃ | Users can make their own choices | |
Alarm partition | A | 800/single channel | |
Maximum number of alarms | A | 1000 | |
Alarm record | Bar | ≤1000 | |
Alarm type | / | High temperature threshold, positive temperature rise threshold, regional temperature difference threshold, user-defined warning, etc. | |
Type of fault | / | Main engine failure and fiber breakage | |
Size of equipment | mm | 482 × 420 × 133 (standard 3 U, W × D × H) | |
Applicable ambient temperature | ℃ | Thermometry host: -25 ~ + 55 Long-term temperature of optical cable: -20 ~ 75 Short-term temperature of optical cable: -40 ~ 150 (after 2 hours of installation, under stress-free conditions) | |
Thermometry range | ℃ | -200 ~ 300 (the measurement temperature range is determined by the structure of the optical cable) | |
Temperature resolution | ℃ | ≤0.1 | |
Spatial resolution ① | m | 0.5, 1, 3 (customizable) | |
Temperature accuracy ② | ℃ | ≤ ± 1 @ 1m spatial resolution, ≤ ± 1.5@0.5m spatial resolution | |
Positioning accuracy | m | ≤±1@10KM；≤±3@20KM； | |
Sampling interval | m | ≤±0.4@10KM；≤±1@20KM； | |
Relay output | Road | 20 (expandable to 240 outputs) | |
Power supply | V | DC24、AC220 | |
Power | W | ≤35 | |
Operating System | / | Windows, Linux (customizable) | |
Support agreement | / | Modbus TCP, private TCP/IP (customizable) | |
Storage space | G | 1024 (standard mechanical hard drive), 128 (SSD customizable) | |
Host interface | A | RJ45*1、RS232*1、USB*2、VGA*1、HDMI*1 | |
Fiber type | / | MM：62.5/125μm、50/125μm SM: 9/125 μm (customizable) | |
Connector type | / | FC/APC, E2000 (customizable) | |
Storage temperature | ℃ | -40~+80 | |
Operating humidity | / | (0-95%) R. H. Non-condensable | |
Host life | Year | 10 | |
Degree of protection | / | Host IP30, optical cable IP68 | |
Weight of the main engine | Kg | ≤8 | |
Note ①: The spatial resolution of the host is 2.5KM at the typical temperature of 25 ℃, measured by the method of 10% -90% of the rising edge of the temperature curve. Note ②: When the host is at a typical temperature of 25 ℃, the temperature range of 2.5KM optical cable is 20 ℃ -100 ℃. | |||
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