Title :
Fabry–Pérot Cavity Based on Hollow-Core Ring Photonic Crystal Fiber for Pressure Sensing
Author :
Ferreira, Marta S. ; Bierlich, Joerg ; Lehmann, H. ; Schuster, Kay ; Kobelke, Jens ; Santos, José Luís ; Frazão, Orlando
Author_Institution :
INESC Porto, Porto, Portugal
Abstract :
An interferometric Fabry-Pérot cavity based on hollow-core ring photonic crystal fiber (HCR-PCF) for pressure sensing is proposed. The sensing head is formed by splicing a small section of HCR-PCF to standard single mode fiber. The spectral response depends on the cavity length due to the geometry of the HCR-PCF. The sensing head is subjected to methane pressure variations, where it exhibits a sensitivity of 0.82 nm/MPa. Its response to nitrogen pressure variation is also studied. The sensing head´s intrinsic sensitivity to the nitrogen refractive index variations inside the hollow-core is also estimated. Finally, temperature measurement is performed and a sensitivity of 3.77 pm/°C is obtained for temperatures below 200°C.
Keywords :
Fabry-Perot interferometers; fibre optic sensors; holey fibres; organic compounds; photonic crystals; pressure measurement; pressure sensors; refractive index; splicing; HCR-PCF; cavity length; hollow-core ring photonic crystal fiber; interferometric Fabry-Perot cavity; methane pressure variations; nitrogen pressure variation; pressure sensing; refractive index variations; spectral response; splicing; standard single mode fiber; temperature measurement; Cavity resonators; Optical fiber sensors; Optical fibers; Optical interferometry; Refractive index; Sensitivity; Interferometry; optical fiber sensor; photonic crystal fiber;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2222368
