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The application of distributed fiber optic temperature measurement system and the principle of distributed fiber optic sensors

Application of Distributed Fiber Optic Temperature Sensors on Hosts in Different Fields

In recent years, fiber optic sensors have received widespread attention due to their high sensitivity, resistance to electromagnetic interference, corrosion, high temperature, and wide measurement range. They have gradually been developed and applied in industrial measurement and production fields. Among them, distributed fiber optic sensing systems have long-distance distributed sensing capabilities, forming application advantages that other sensors cannot replace in certain fields (such as subway and oil and gas pipeline long-distance distributed temperature measurement fields).

Fiber optic sensing technology is constantly advancing and has been widely used in many fields such as military, national defense, aerospace, industrial and mining enterprises, energy and environmental protection, industrial control, etc. It has many advantages such as strong anti-interference, high reliability, and can be deployed in various complex environments. With the continuous progress of fiber optic sensing technology, distributed fiber optic sensing technology, as a sensing technology that can be used for long-distance monitoring, has begun to be widely applied in safety monitoring of fire pipelines. Distributed fiber optic sensing technology reduces the manpower and material resources required on the detection line and improves monitoring efficiency by laying optical cables along the monitoring line, analyzing the signals of each monitoring point in real time, intelligently identifying the behaviors that occur at each point, and generating reasonable alarms.

Distributed fiber optic temperature measurement application for cable temperature measurement

With the implementation of urban power grid renovation and the decrease in cable application costs, power cables have been increasingly widely used. In some cities in China, overhead lines have gradually been replaced, but the subsequent application of cables has led to a significant increase in their quantity and problems caused by prolonged operation time. Therefore, cable faults continue to occur, and issues such as the distance and location of cable faults have attracted great attention. Especially now, the joints of cables are the most prone to faults in power cables. However, inadequate fault handling and monitoring of the joints often lead to power outages and maintenance, resulting in certain economic losses.

The principle of fiber optic sensing technology

When light waves are transmitted along optical fibers under the principle of total reflection and enter optical sensing probes (which can be optical fibers or other photosensitive components), the sensing probe modulates the light signal under the influence of external measured parameters (temperature, pressure, deformation, acceleration, magnetic field, etc.), causing changes in the intensity, polarization state, interference effect, diffraction effect, scattering effect, etc. of the light waves to become modulated signal light. Then, it is transmitted through optical fibers to the photodetector and demodulator, extracting parameters such as light intensity, phase, amplitude, polarization state, wavelength that characterize the characteristics of the light signal, and demodulating the corresponding measured changes based on their changes.

In recent years, with the gradual increase of high-rise buildings in China, the requirements for foundation pits in buildings have become increasingly high. The leakage of underground continuous walls in foundation pit engineering is an important factor affecting engineering safety. Drawing on reliable detection techniques to timely determine the location and degree of leakage has attracted more and more attention and attention in the engineering field. At present, the methods used for leakage detection include electrical detection, capacitive sensors, etc. However, these methods have their limitations and cannot be well applied to the leakage detection of underground continuous walls. Distributed fiber optic temperature sensing technology is currently the most widely used and suitable method for detecting leakage in underground continuous walls. Fiber optic sensing technology provides a distributed fiber optic temperature measurement based underground continuous wall leakage detection device for monitoring oil and gas pipeline leaks and monitoring dam leakage phenomena. It is very important to discover the leakage location and degree. It can prevent wall collapse, timely treat problems, and ensure the safety of the project and the safety of people’s lives and property.

Distributed fiber optic sensing technology

In distributed fiber optic sensing technology, fiber optic is both an information transmission medium and a sensing unit. Distributed Raman temperature sensing technology is a fiber optic sensing technology used for real-time measurement of temperature field distribution. Based on Raman scattering, anti Stokes light is sensitive to temperature, but Stokes light is not sensitive to temperature. This property can be used to measure the temperature distribution over the entire length of the fiber optic.



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