title: Micro-displacement sensor based on a hollow-core  photonic crystal fiber.
abstract: A sensing head based on a hollow-core photonic crystal fiber for in-reflection measurement of micro-displacements is presented. The sensing structure takes advantage of the multimodal behavior of a short segment of hollow-core photonic crystal fiber  in-reflection, being spliced to a single mode fiber at its other end. A modal interferometer is obtained when the sensing head is close to a mirror, through which displacement  is measured.
authors.affiliation: Departamento de Ingeniería Eléctrica y Electrónica, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona-Navarra, Spain. anamargarida.rodrigues@unavarra.es
authors.forename: Ana Margarida
authors.initials: AM
authors.lastname: Rodrigues Pinto
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Baptista
authors.forename: José Luís
authors.initials: JL
authors.lastname: Santos
authors.forename: Manuel
authors.initials: M
authors.lastname: Lopez-Amo
authors.forename: Orlando
authors.initials: O
authors.lastname: Frazão
mesh_terms: D004867:Equipment Design; D006801:Humans; D007368:Interferometry; D055100:Optical Fibers; D055095:Optics and Photonics; D012031:Refractometry