On the frequencies of the PPP-BOTDA distributed optical fiber sensor in the monitoring of landslide

This work investigates the potential of application of the recently developed PPP-BOTDA distributed optical fiber sensor technology in monitoring landslide deformation. Two optical fibers, i.e., the temperature optical fiber sensor and the strain optical fiber sensor, are buried under the surface of the Baishuihe landslide example. For the oscillation of the three groups of monitoring data, the Butterworth low-pass filter is particularly designed to minimize the disturbance of the noise signals；and the comparison among the four groups of different sampling frequencies were conducted to derive the most suitable value of the n and the Wn. Then the area difference between the curve and the horizontal axis along the optical fiber line is utilized to make quantitative evaluation of the strain. The PPP-BOTDA distributed optical fiber sensor technology demonstrates the ability in monitoring landslide deformation and provides a new way to this deformation monitoring.