AN ALL-FIBER GAS SENSING SYSTEM USING HOLLOW-CORE PHOTONIC BANDGAP FIBER AS GAS CELL

An all-fiber compact gas sensing system using a hollow-core photonic bandgap fiber (HC-PBF) as a gas cell is proposed in this paper. Compared with the present reported microstructured optical-fiber gas cells, the HC-PBF gas cell proposed here has relatively lower transmission loss and much simpler construction. The total transmission loss through the HC-PBF gas cell is demonstrated experimentally to be as low as 1.5 dB and the time taken for gas to get into the 90-cm-cell, under the free diffusion condition, is approximately 11 min. Combining the HC-PBF gas cell with a tunable fiber laser, an all-fiber gas sensing system is developed. The properties of the proposed system are demonstrated experimentally by detection of carbon monoxide (CO) and acetylene (C2H2). Approximately linear relationships between the system responses and the concentrations of the detected gases are experimentally demonstrated. The minimal detectable concentration of CO of 300 ppm and C2H2 of 5 ppm are also achieved respectively by the experiments.

[1]  W. Schade,et al.  Near- and mid-infrared laser monitoring of industrial processes, environment and security applications , 2006 .

[2]  G. Vienne,et al.  Air-guiding photonic bandgap fibers: spectral properties, macrobending loss, and practical handling , 2004, Journal of Lightwave Technology.

[3]  John U. White.  Long Optical Paths of Large Aperture , 1942 .

[4]  B. Washburn,et al.  Arc fusion splicing of hollow-core photonic bandgap fibers for gas-filled fiber cells. , 2006, Optics express.

[5]  E. M. dos Santos,et al.  Lateral access to the holes of photonic crystal fibers - selective filling and sensing applications. , 2006, Optics express.

[6]  Anders Bjarklev,et al.  Material effects in air-guiding photonic bandgap fibers , 2003 .

[7]  A. Gaeta,et al.  Photonic band-gap fiber gas cell fabricated using femtosecond micromachining. , 2007, Optics express.

[8]  David J. Richardson,et al.  Sensing with microstructured optical fibres , 2001 .

[9]  Georges Humbert,et al.  Hollow core photonic crystal fibers for beam delivery. , 2004, Optics express.

[10]  Herwig Kogelnik,et al.  Off-Axis Paths in Spherical Mirror Interferometers , 1964 .

[11]  Takaya Iseki,et al.  A portable remote methane sensor using a tunable diode laser , 2000 .

[12]  A. Bjarklev,et al.  Gas sensing using air-guiding photonic bandgap fibers , 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

[13]  T. A. Birks,et al.  Compact, stable and efficient all-fibre gas cells using hollow-core photonic crystal fibres , 2005, Nature.

[14]  W. Jin,et al.  Design and modeling of a photonic crystal fiber gas sensor. , 2003, Applied optics.

[15]  Hui Ding,et al.  A novel fiber Fabry–Perot filter based mixed-gas sensing system , 2009 .