Simultaneous temperature and force measurement using Fabry-Perot interferometer and bandgap effect of a fluid-filled photonic crystal fiber.

A novel fiber sensor capable of simultaneously measuring force and temperature is proposed and investigated. A section of high-index-fluid-filled photonic bandgap fiber (HIFF-PBGF) is inserted in a fiber loop to act as the sensing head. Photonic bandgap effect of the HIFF-PBGF as well as Fabry-Perot interferometer (FPI) introduced by controlling the splicing between the HIFF-PBGF and single mode fiber is used for achieving force and temperature discrimination. Taking advantage of the bandgap being high sensitivity to the temperature, a high temperature sensitivity of more than -1.94 dB/°C is achieved, which is the highest based on the intensity measurement, to our best knowledge. Meanwhile, a force sensitivity of 3.25 nm/N (~3.9 pm/με) is obtained, which could be enhanced by controlling the FPI shape. The device also has the strong points of easy fabrication, compact structure and high interference fringe contrast.

[1]  Bo Dong,et al.  Simultaneous strain and temperature measurement using a compact photonic crystal fiber inter-modal interferometer and a fiber Bragg grating. , 2010, Applied optics.

[2]  T. Koch,et al.  Antiresonant reflecting optical waveguides in SiO2‐Si multilayer structures , 1986 .

[3]  Orlando Frazão,et al.  Simultaneous measurement of strain and temperature using a Bragg grating structure written in germanosilicate fibres , 2004 .

[4]  L. Ferreira,et al.  Simultaneous measurement of strain and temperature using Bragg gratings written in germanosilicate and boron-codoped germanosilicate fibers , 1999, IEEE Photonics Technology Letters.

[5]  Optimization of photonic bandgap fiber long period grating refractive-index sensors , 2009 .

[6]  Hwa-Yaw Tam,et al.  Simultaneous strain and temperature measurement using a superstructure fiber Bragg grating , 2000 .

[7]  Tao Zhu,et al.  PCF-Based Fabry–Pérot Interferometric Sensor for Strain Measurement at High Temperatures , 2011, IEEE Photonics Technology Letters.

[8]  Vittoria Finazzi,et al.  Fabry-Perot interferometers built by photonic crystal fiber pressurization during fusion splicing. , 2011, Optics letters.

[9]  J. Villatoro,et al.  Spheroidal Fabry-Perot microcavities in optical fibers for high-sensitivity sensing. , 2012, Optics express.

[10]  Zhi Wang,et al.  Simultaneous force and temperature measurement using long-period grating written on the joint of a microstructured optical fiber and a single mode fiber. , 2010, Applied optics.

[11]  Li Wei,et al.  Simultaneous measurement for strain and temperature using fiber Bragg gratings and multimode fibers. , 2008, Applied optics.

[12]  J. Lee,et al.  Simultaneous measurement of strain and temperature by use of a single-fiber Bragg grating and an erbium-doped fiber amplifier. , 1999, Applied Optics.

[13]  Tingting Han,et al.  Avoided-crossing-based ultrasensitive photonic crystal fiber refractive index sensor. , 2010, Optics letters.

[14]  Lei Xu,et al.  Simultaneous strain and temperature measurements with fiber Bragg grating written in novel Hi-Bi optical fiber , 2004 .

[15]  G.M. Williams,et al.  Hybrid fiber Bragg grating/long period fiber grating sensor for strain/temperature discrimination , 1996, IEEE Photonics Technology Letters.

[16]  Benjamin J. Eggleton,et al.  Ultra-sensitive photonic crystal fiber refractive index sensor , 2009, 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum electronics and Laser Science Conference.

[17]  Li Wei,et al.  Simultaneous measurement of strain and temperature based on a fiber Bragg grating combined with a high-birefringence fiber loop mirror , 2008 .

[18]  Ian Bennion,et al.  Dependence of temperature and strain coefficients on fiber grating type and its application to simultaneous temperature and strain measurement. , 2002, Optics letters.

[19]  Zhi Wang,et al.  Liquid crystal photonic bandgap fiber: different bandgap transmissions at different temperature ranges. , 2008, Applied optics.