A Novel Technique for Civil and Geotechnical Engineering Monitoring:Performance and Characteristics of BOFDA

In this paper,the performance of a novel technology—Brillouin optical frequency domain analysis(BOFDA)was tested and analyzed on the basis of experiments,and its spatial resolution,test accuracy and repeatability are 20 cm,±2×10-6 and ±4×10-6,respectively;Secondly,based on the tests,the comparison between brillouin time domain analysis and brillouin frequency domain analysis was conducted,and the reason of strain transition section was revealed.Thirdly,by comparing with traditional strain gauges measurements and theoretical calculations,we adopted the BOFDA to the equal intensity beam to verify the excellent test performance in the strain measurement.At last,the possible problem of BOFDA′s application in the monitoring of disaster prevention and mitigation project,such as temperature compensation and cable protection,was discussed and the corresponding solution is also presented.