Large steel structure health online monitoring industry solu

Summary

Large scale structure monitoring is one of the most active applications of FBG sensors. The construction and operation monitoring of large span spatial structures is an important part of social security. The measurement of mechanical parameters is very important for the maintenance and health monitoring of bridges, mines, tunnels, dams, buildings and so on. By measuring the strain distribution of the above structure, the local load and health condition of the structure can be predicted. The traditional electromagnetic sensing technology is difficult to realize long-term, real-time and on-line monitoring; it is easy to produce zero drift by electromagnetic interference, damp and chemical corrosion. The vibrating string strain gauge is not suitable for long term measurement of dynamic strain of bridge because of its frequency response characteristic; the signal line of electromagnetic sensor is numerous, the transmission distance is near and easy to be disturbed. The fiber Bragg grating sensor overcomes all the disadvantages above, which can be attached to the surface of the structure or in the pre embedded structure. The structure is detected by health detection, impact detection, shape control and vibration damping to monitor the structural defects. In the field of large space structure monitoring, advanced fiber Bragg grating sensing technology has gradually replaced the traditional electromagnetic sensing technology.

application area

1. monitoring of surface strain of bridges or dams or embedded monitoring of steel bars;

2. steel structure surface strain health monitoring;

3. health monitoring of Aeronautics and Astronautics, ship structure;

4. health monitoring of strain, displacement and pressure of mine, tunnel, landslide and pile foundation.

Health monitoring of 5. comprehensive corridor structure

Monitoring type

1. construction monitoring: construction monitoring is the monitoring of the structural state of the key stage of construction to ensure the safety of construction, construction quality, and timely discovery of structural hidden dangers.

2. structure load test monitoring: completion of structure construction, test structure bearing capacity and stress and deformation state before operation. The experimental value obtained by load experiment is the archival data that reflects the initial state of the structure.

3. operation stage monitoring: the health monitoring in the operation stage is with the increase of service age, the aging of material performance and the continuous degradation of the structure performance. The monitoring system monitors the deformation, stress, strain, displacement and other data of each node in real time to compare the data with the datum state, in order to evaluate the actual safety state of the structure. ;

System characteristics

1. all-optical network, which is essentially explosion-proof, lightning resistant and corrosion resistant, can be applied in harsh environments.

2. the long distance signal can be transmitted to more than 40km.

3. high sensitivity, fast response and maximum acquisition frequency of 1000Hz, which can meet the needs of high-speed monitoring of different objects.

The 4. volume is small and easy to install.

The 5. sensor uses the characteristic of the center wavelength shift of the reflection grating to measure the strain value of the tested structure without zero drift and no calibration.

Install photos