LAUSR

Abstract The inclinometer is widely used in the deformation monitoring of civil and hydraulic engineering, but the manual observation required for existing traditional inclinometers is time-consuming, laborious and workload-intensive; an inclinometer with automatic monitoring is expensive, difficult to use for achieving distributed monitoring and shows poor instrument durability. To overcome the shortcomings of traditional inclinometers, a distributed optical fiber inclinometer (DOFI) is developed based on the conjugate beam method and distributed strain measurement technology. Compared to Euler-Benuli beam based converting method, the conjugate beam based method is more flexible and accurate to monitor the deformation of the slope under the heterogeneity geological conditions. Numerical simulation and laboratory tests show that the conjugate beam based inclinometer (DOFI) is effective, feasible and accurate. It can be used to quickly and accurately measure the deformation and direction of rock and soil mass, such as slope, and can realize long-term on-line monitoring.