Treffer: Post-processing of fiber optic sensors data with consideration of strain transfer for distributed strain measurements

In recent years, fiber optic sensors are widely used in structural health monitoring due to their highspatialresolution distributed measurements. However, strain transfer through protective coatings of thesensors can distort measurements, especially in high strain gradients. To correct this, mathematical modelsof strain transfer have been developed and validated through numerical simulations and experiments.Recovering the actual strain profile involves inverting these models, particularly a 1D second-order differentialequation derived from a 3D model. This equation, subject to boundary conditions, must besolved repeatedly for efficient numerical inversion. Given the high sampling frequencies of fiber opticsensors, fast algorithms are crucial for real-time applications such as vibration analysis. This paper proposesan efficient method to solve the 1D strain transfer equation and its inverse problem. By enablingrapid post-processing of strain measurements, this approach aims to enhance the application of fiber opticsensors in vibration analysis and structural health monitoring.