Application of FBG sensor
1. Application in geodynamics
In the field of geodynamics such as seismic detection, the principle of surface sudden change and its risk assessment and prediction are very complicated, and the stress and temperature changes in the volcanic area are the key to revealing volcanic activity and its key. The most effective means of evolution of the scope of activities. The application of FBG sensors in this field is mainly in the detection of rock deformation, vertical seismic waves and the use of topographic detectors and optical seismographs. The strain in the active area usually includes static and dynamic. Static strain (including static deformation caused by volcano, etc.) is generally located at a distance close to the source of geological deformation, while dynamic strain represented by the seismic wave of the source can Detected in the surrounding environment of the Earth far from the source. In order to obtain a fairly accurate location of the source or volcanic source and better describe the geometry and evolution of the source zone, a densely arranged stress-strain gauge is required. Fiber Bragg Grating Sensor is a broadband, high-networked sensor that can realize long-distance and densely-arranged multiplexing sensing. It meets the requirements of seismic detection and so on, so it has undoubtedly a large potential use in the field of geodynamics. It has been reported that fiber grating sensors have successfully detected rock and surface dynamic strains with a frequency of 0.1 Hz to 2 Hz and a size of 10-9 e.
2. Application in spacecraft and ships
Advanced composite materials have good fatigue and corrosion resistance, and can reduce the weight of hull or spacecraft. They are of great significance for fast shipping or flight. Therefore, composite materials are increasingly used in the manufacture of aviation and navigation tools (such as aircraft). Wing).
In order to comprehensively measure the condition of the hull, it is necessary to understand the deformation torque, shear pressure and the impact force of the deck. The general hull requires about 100 sensors, so the fiber grating sensor with extremely high wavelength multiplexing capability is most suitable for the hull. Detection. The fiber Bragg grating sensing system measures the bending stress of the hull and measures the impact of the waves on the wet deck. The 16-channel fiber Bragg grating multiplexing system with interference detection performance successfully achieved dynamic strain measurement with a bandwidth of 5 kHz and a resolution less than 10ne/(Hz) 1/2.
In addition, in order to monitor the strain, temperature, vibration, landing and driving state, ultrasonic field and acceleration of an aircraft, usually more than 100 sensors are required, so the weight of the sensor should be as light as possible and the size should be as small as possible, so the most dexterous fiber grating sensor Is the best choice. In addition, there are actually two directions of strain in the composite material of the aircraft. The fiber grating sensor in the embedded material is an ideal intelligent component for realizing multi-point multi-axial strain and temperature measurement.
The composite pipe has fully exerted the high strength, toughness, impact resistance, good welding performance and high hardness, high wear resistance, corrosion resistance and heat resistance of the steel tube, which overcomes the low hardness, poor wear resistance and poor toughness of the steel tube. specialty. Ceramic tubes are widely used in the following industries:
First, the mine:
1. Coal water slurry, coal washing mud, mine filling and coal powder in coal industry;
2. Metal mines: pipeline transportation of concentrates and tailings.
Second, metallurgy:
1. Pipes for coal injection and slag transfer in blast furnaces of iron and steel plants;
2. Pipes for transportation of iron alloys, refining, and optimization of steelmaking.
3. Cement Plant: Raw slurry transportation, pulverized coal transportation, hoist cutting, concrete conveying pipeline of rotary kiln wet production line.
Fourth, coal-fired power plants in addition to ash, slag, powder feeding, powder return, desulfurization of lime gypsum slurry transport.
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