| At present, the safety problems of bridges, dams, natural gas pipelines, wind farm and other large infrastructure are increasing quickly, there is a great demand for the technology in the safety monitoring of these facilities structure, while the real-time monitoring of facilities strain is one of its goals.Optical method and optical fiber sensing technology have many advantages such as strong anti-jamming, high measurement precision and easy to multiplexing when they were used in strain measurement, this paper puts forward low coherent strain measurement method through the analysis of strain measurement method, and low coherent method of optical fiber strain measurement technology was analyzed in theory as well. A strain measurement system of 1550nm Amplifier Spontaneous Emission (ASE) was designed based on the optical low-coherence interference theory, which carried on the detailed design on optical road, the signal interference module collection, processing module, display storage and control module, respectively. In software section, with the LabVIEW a good human-machine interaction properties of PC software platform was designed as well. In order to restrain dispersion and filter signal noise interference, the method of system optimization had been studied which was also enhanced the measurement's precision and stability. The method that low coherent strain measurement used in tensional deformation and torsion deformation can also be applied in the monitoring of structure strain.The system performance experiment showed that the linearity of the system was±0.44% and the repeatability was 0.4%, and sensing capacity is good. While the experimental studies of this system demonstrated that the system can be sensible to detect the trend and deformation of structure's tensional deformation and torsion deformation, which has good application value. The research will lay the foundation for the further study of all-optical strain measurement technique. |
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