Application of Fiber Optic Sensing Technology and Fiber Bragg Grating Sensing Technology in High Spe

In recent years, a large number of researchers have been committed to the research and development of high reliability monitoring technology, gradually replacing the traditional monitoring methods, such as distributed optical fiber sensing technology and fiber Bragg grating sensing technology, which have sprung up and recognized by the engineering community in recent years.

In recent years, with the development of the cornerstone of China's infrastructure construction, such as the rapid construction of infrastructure such as high-speed railway, highway, bridge, tunnel, dam, electric power, communication and petrochemical industry, it has promoted the rapid development of China's economy. When it comes to the development of infrastructure, of course, it is inseparable from the renewal and iteration of engineering safety monitoring technology. Although the traditional monitoring technology is cheap, it has poor reliability, large construction volume, poor maintainability, short service life and poor environmental adaptability, so it can not escort the whole life cycle of large-scale projects.

Therefore, in recent years, a large number of researchers have been committed to the research and development of high reliability monitoring technology and gradually replace the traditional monitoring methods, such as distributed optical fiber sensing technology and fiber Bragg grating sensing technology, which have sprung up and recognized by the engineering community in recent years.Application of fiber Bragg grating sensing technology in high speed railway monitoringAmong them, the fiber Bragg grating sensing technology can realize the temperature, humidity, micro strain, tensile pressure load, vibration, wind speed, wind direction, wind pressure, rainfall, displacement, deflection, water pressure, water level, oil pressure, earth pressure, flow rate, inclination, metal corrosion within tens of kilometers to hundreds of kilometers by using an ordinary optical cable with a diameter of 1 3mm (or a bare optical fiber with a diameter of 0.2mm) Real time on-line monitoring of physical quantities such as ash accumulation and icing load.

The sensors can be connected in series, quasi distributed measurement and anti electromagnetic interference. All the sensors are passive optical devices, which have the advantages of high and low temperature resistance, corrosion resistance, water and humidity resistance, maintenance free, long service life, high precision, low price of optical cable and low construction cost, so they are widely used in petroleum, electric power, chemical industry, railway, ocean, tunnel, underground Mines and other harsh and complex environments.Application of distributed optical fiber sensing system in bridge monitoringThe distributed optical fiber sensing system can realize the real-time on-line monitoring of temperature, strain and vibration within tens of kilometers to hundreds of kilometers by using an ordinary optical cable with a diameter of 1 3mm (or a bare optical fiber with a diameter of 0.2mm).

The convenience and high efficiency of the distributed optical fiber sensing system are amazing, which can be called the technical revolution in the field of engineering monitoring. This technology is especially suitable for engineering fields such as tunnels, underground pipe networks, bridges, cable trenches, dams, slopes, buildings, subways, State Grid, etc. with fast installation, short construction period and small construction volume, the construction cost can be greatly reduced.It is worth mentioning that all passive optical cables are used as the sensing end within the monitoring range of hundreds of kilometers. There is no need to lay any sensors. It has high reliability, high and low temperature resistance, electromagnetic radiation resistance, high pressure resistance and corrosion resistance. It has a service life of up to decades, and the later maintenance is simple or even maintenance free.

In sharp contrast to the traditional electronic monitoring system, which has complex sensor installation and layout, a large number of shielded cable wiring, complex system integration, poor electromagnetic resistance, poor environmental adaptability and high maintenance cost, the distributed optical fiber sensing system has the unique advantages of high efficiency, simplicity, high reliability, long service life and strong environmental adaptability, Even the j-20, the most advanced fourth generation stealth fighter in China's military, also uses the distributed optical fiber system. It can be seen that the distributed optical fiber monitoring system is another technological revolution in the field of engineering monitoring. It will be widely used in the future and will replace the traditional electronic system to better serve the engineering field.

Editing: hfy