Methane sensing using multiple-coupling gaps in hollow-core photonic bandgap fibers
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AuthorLázaro Urrutia, José Miguel; Cubillas de Cos, Ana María; Silva López, Manuel; Conde Portilla, Olga María; Petrovich, Marco N.; López Higuera, José Miguel
© 2008 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Proceedings of SPIE, 2008, vol. 7004, 70044U
19th International Conference on Optical Fibre Sensors, Perth, 2008
SPIE Society of Photo-Optical Instrumentation Engineers
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Hollow-core photonic bandgap fibers
Gas detection and gas sensing based on hollow core photonic bandgap fiber (HC-PBF) is a very promising technique due to the long interaction light-gas lengths that are achievable. However, long path-lengths also imply higher gas filling times of the hollow fiber and higher response times of the detection systems what can constitute a serious practical inconvenience. In this paper, the high sensitivity is maintained but the sensor response time is reduced by using multiple-coupling fiber gaps. The results and conclusions extracted from a systematic experimental study (comparing the spectra and filling time of different HC-PBF lengths and different number of coupling gaps) are presented and discussed. Finally, the maximum number of gaps allowed in the system is modelled.
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