Cable Distributed Fiber Optic Temperature Measurement System
IN-305D Cable distributed fiber optic temperature measu...rement system
The temperature measurement of the DTS is based on the spontaneous Raman Raman scattering effect. High-power narrow pulse width laser pulse LD incident on the sensing fiber, the laser and fiber molecules interact to produce extremely weak backscattered light, scattered light has three wavelengths, respectively, Rayeigh (Rayleigh), anti-stokes (anti-stokes) and stokes (stokes) light; where anti-□stokes temperature sensitive, for the signal light; stokes temperature insensitive, for the reference light. Stokes temperature insensitive, for the reference light. The signal light backscattered from the sensing fiber passes through the beam splitter module WF again, isolates the Rayeigh scattered light, transmits the temperature-sensitive anti-stokes signal light and the temperature-insensitive stokes reference light, and is received by the same detector (APD), and the temperature can be calculated based on the ratio of the light intensities of the two. The position is determined based on optical time-domain reflectance (OTDR) technology, which uses high-speed data acquisition to measure the echo time of the scattered signal to determine the position of the fiber corresponding to the scattered signal.
Device Introduction
The Distributed Fiber Optic Temperature Measurement Device (DTS) is an innovative temperature monitoring system that utilizes the Raman scattering effect of optical fibers and Optical Time Domain Reflection (OTDR) technology to achieve real-time, continuous temperature measurement. The device senses the temperature distribution along the route by analyzing the changes of backscattered light in the optical fiber, and is capable of monitoring not only the temperature of a single point or multiple points, but also providing the temperature profile of the entire power cable path. With the characteristics of anti-electromagnetic interference, corrosion resistance and intrinsic safety, it is widely used in temperature monitoring of cables of various voltages and other cables to ensure safe operation, and is an important part of intelligent monitoring technology for intelligent power.
Technical performance and specification parameters [All functions can be customized]
| Fiber Type | Multimode fiber, single mode fiber optional |
| Measuring Distance | 0-30km |
| measurement channel | 1-16 |
| spatial resolution | 0.5-3 m |
| sampling interval | 0.25 / 0.5 m |
| position accuracy | 0.5-1 m |
| measuring time | Typical 5 s |
| Temperature measurement range | -100°C ~ 550°C (depending on fiber optic cable) |
| Temperature measurement accuracy | 1°C |
| Temperature resolution | 0.1°C |
| Fixed temperature alarm action temperature | 85°C (user-defined) |
| optical connector | FC/APC |
| Operating power | 12-36 VDC, 8 W |
| operating temperature | 0-40°C |
| Storage temperature | -20-60°C |
| Operating humidity | 0-95% R.H. Non-condensing |
| communications interface | Ethernet, 485, RS232, Relay |
| storage space | 2000 alarm records, unlimited storage with a PC |
Functional Features
- Fully Distributed: DTS detects the complete distribution of temperatures along the entire fiber in seconds, without missing a beat;
- Long-distance monitoring: single-mode and multi-mode monitoring host, up to 30KM;
- Electromagnetic inertia: The temperature measurement fiber is composed of quartz, electrically insulated, and is not subject to any electromagnetic interference, nor does it emit electromagnetic waves;
- Intrinsic safety: especially suitable for various complex environments and strong electric environments;
- Precise positioning: the temperature sensing element is temperature measurement fiber, the average power of the internal transmission of the optical signal is micro-watt level; intrinsically safe positioning accuracy of ± 1M;
- Fast response: single channel scanning time is less than 3 seconds;
Cable fiber optic temperature measurement system solutions
Overall scheme design: according to the actual situation of the cable, the monitoring cable to build a complete set of fiber-optic temperature monitoring system, to achieve real-time monitoring of the temperature of the cable in various places, over the limit of the alarm, the output alarm signal.
Use one IF-DTS distributed fiber optic temperature sensing system to achieve online monitoring and fire alarm for the whole cable.
design proposal
Cable temperature monitoring system using distributed fiber optic fire detector, laying fiber optic cables on the cable, in the system management center to install temperature sensing detector host, from the host to the cable lead detection fiber optic cable. The use of when the temperature changes, along the fiber optic reflection back to a small part of the La Diffuse Scattered Light, this backward scattered light signal acquisition and analysis in the optoelectronic device, thus providing information about the temperature, to determine the location of the rapid change in temperature, so as to determine the point of occurrence of the fire. When the distributed fiber optic temperature sensing host detects a fire abnormality, the fire alarm host immediately displays an alarm.
Fiber optic laying of cable jackets and cable bodies
Critical cable construction: this time the need for temperature monitoring of each cable, the cable using table-applied (external) optical fiber cable fixing. Laying of fiber optic cables, fiber optic cable fasteners (insulation ties) fixed, so that the fiber optic cable and the outer surface of the cable tightly combined, set up and in kind as shown in the following chart.
