Distributed fiber optic temperature measurement system

The distributed fiber optic temperature measurement system adopts advanced optoelectronic technology, communication technology, microprocessor technology, digital temperature sensing technology, and uniquely designed low-temperature, strong electric field, and humid environment operation technology. It can monitor the temperature in different environments separately, detect accident hazards early, and minimize losses. At the same time, it can also provide a large amount of online monitoring data, providing reliable basis for operators to comprehensively understand the operation of heating pipelines.

The distributed fiber optic sensing temperature analyzer is the main body of the DTS distributed fiber optic temperature measurement system. The fiber optic temperature measurement host is responsible for the signal acquisition, signal processing, data analysis, over temperature alarm, network transmission and other functions of the entire system. It is composed of an optical frequency generator, switching power supply, microprocessor, network interface, etc., and is the core device for photoelectric conversion and information processing.

Fully distributed: DTS can detect the complete temperature distribution along the entire fiber optic cable in seconds without any omissions.
Long distance monitoring: Single mode and multi-mode monitoring hosts, with a maximum length of 40 kilometers.
Electromagnetic inertness: Temperature measuring optical fibers are composed of quartz, electrically insulated, not subject to any electrical interference, and do not emit electromagnetic waves, making them particularly suitable for various complex and strong electrical environments.
Intrinsic safety: The temperature sensing element is a temperature measuring optical fiber, and the average power of the optical signal transmitted internally is at the micro watt level; Intrinsic safety
Accurate positioning: The positioning accuracy reaches ± 1M.
Quick response: Single channel scanning time less than 3 seconds

The temperature measurement of DTS is most based on the spontaneous Raman scattering effect. After high-power narrow pulse laser pulse LD is incident on the sensing fiber, the laser interacts with the fiber molecules, producing extremely weak backscattered light. The scattered light has three wavelengths, namely Rayleigh, anti Stokes, and Stokes light: anti Stokes is temperature sensitive, is signal light; Stokes is temperature insensitive, is reference light. The backscattered signal light from the sensing fiber passes through the splitter module WF and the isolated Rayleigh scattered light again. It passes through the temperature sensitive anti sokes signal light and the temperature insensitive Stokes reference light, and is received by the same detector (APD). The temperature can be calculated based on the ratio of the two light intensities. The determination of the position is based on the optical time-domain reflection OTDR technology, which uses high-speed data acquisition to measure the echo time of the scattered signal and determine the fiber position corresponding to the scattered signal.

Power system. It can be used for temperature monitoring of power switchgear, providing real-time temperature data collection, storage, and display, supporting remote network online status inquiry, and can set different alarm conditions according to user requirements.

Fire warning. The distributed fiber optic temperature measurement system can automatically alarm, easily locate the location of a fire, and has high measurement distance, high measurement accuracy, and fast response speed.

Online monitoring of high-voltage cables. It is used to monitor temperature changes in cables and prevent safety hazards caused by overheating.

Traffic tunnel fire monitoring. In narrow spaces such as tunnels, distributed fiber optic temperature measurement systems can monitor temperature changes in real time and detect fires in a timely manner.

Dam leakage monitoring. In areas where leakage may occur, the occurrence of leakage can be detected by monitoring temperature changes.

Coal mine safety. In coal mining environments, this system can be used to monitor the risk of spontaneous combustion fires.

Temperature alarm for oil and cold storage. In flammable and explosive environments, distributed fiber optic temperature measurement systems can provide temperature and fire alarms.

Measurement of temperature distribution in transformers and generator sets. In large-scale power equipment, it is used to monitor temperature distribution, achieve thermal protection and fault diagnosis.

Coal conveyor belt fire monitoring. In the monitoring of coal conveyor belts, the system can detect the overheating of the belts and guide rollers to prevent fires.

Industrial process control. Widely used for online dynamic detection in processes such as chemical engineering, photographic materials, and oil production.