Monitoring and warning system of slope based on distributed fiber optic sensor technology

Kai Liu; Dafa Pan; Tonggang Zhao

doi:10.1117/12.2293281

10 January 2018 Monitoring and warning system of slope based on distributed fiber optic sensor technology

Kai Liu, Dafa Pan, Tonggang Zhao

Proceedings Volume 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications; 106180S (2018) https://doi.org/10.1117/12.2293281
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

This paper illustrates the principle of several common distributed fiber sensing techniques, especially Brillouin optical time domain reflectometry (BOTDR) and optical time domain reflectometry (OTDR). By measuring the frequency shift of spontaneous Brillouin scattering light in fiber, BOTDR could simultaneously monitor both strain and temperature with a high spatial resolution. But the spontaneous Brillouin scattering signal is so weak that it has a high demand of the laser generator and the signal-to-noise ratio of the whole system. Therefore, the BOTDR system is usually too complex, expensive and difficult to be widely used. Unlike BOTDR, OTDR utilizes Rayleigh scattering to measure the loss of fiber. Rayleigh scattering signal is much stronger than spontaneous Brillouin scattering signal, thus OTDR system has the advantages of high sensitivity, long distance and relatively low price. These advantages make OTDR very suitable for wide application in the field of slope monitoring, especially in remote areas where the geographical environment is complex and are difficult for staff to stay.

This paper designed and implemented a slope monitoring and warning system based on the technology of optical time domain reflectometry(OTDR). The test result shows that the system has high sensitivity, strong real-time and provides user friendly interface.

Citation Download Citation

Kai Liu, Dafa Pan, and Tonggang Zhao "Monitoring and warning system of slope based on distributed fiber optic sensor technology", Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 106180S (10 January 2018); https://doi.org/10.1117/12.2293281

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