title: Towards the control of highly sensitive Fabry-Pérot strain sensor based on hollow-core ring photonic crystal fiber.
abstract: A high sensitivity Fabry-Pérot (FP) strain sensor based on hollow-core ring photonic crystal fiber was investigated. A low-finesse FP cavity was fabricated by splicing a section of hollow-core ring photonic crystal fiber between two standard single mode fibers. The geometry presents a low cross section area of silica enabling to achieve high strain sensitivity. Strain measurements were performed by considering the FP cavity length in a range of 1000 μm. The total length of the strain gauge at which strain was applied was also studied for a range of 900 mm. The FP cavity length variation highly influenced the strain sensitivity, and for a length of 13 μm a sensitivity of 15.4 pm/με was attained. Relatively to the strain gauge length, its dependence to strain sensitivity is low. Finally, the FP cavity presented residual temperature sensitivity (~0.81 pm/°C).
authors.affiliation: 1INESC Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal. msaf@inescporto.pt
authors.forename: Marta S
authors.initials: MS
authors.lastname: Ferreira
authors.forename: Jörg
authors.initials: J
authors.lastname: Bierlich
authors.forename: Jens
authors.initials: J
authors.lastname: Kobelke
authors.forename: Kay
authors.initials: K
authors.lastname: Schuster
authors.forename: José L
authors.initials: JL
authors.lastname: Santos
authors.forename: Orlando
authors.initials: O
authors.lastname: Frazão
mesh_terms: D019245:Compressive Strength; D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D013314:Stress, Mechanical; D013718:Tensile Strength; D014160:Transducers, Pressure