A ϕ-Shaped Bending-Optical Fiber Sensor for the Measurement of Radial variation in Cylindrical StructuresVictor Cardoso, Paulo Caldas, M. Thereza R. Giraldi, Orlando Frazão, João Costa and José L. SantosEPJ Web Conf., 266 (2022) 13003DOI: https://doi.org/10.1051/epjconf/202226613003