2 June 2014 High sensitivity methane and ethane detection using low-loss mid-IR hollow-core photonic bandgap fibers
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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91573P (2014) https://doi.org/10.1117/12.2057842
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain
Abstract
We present sub-ppm sensitivity, broadband gas absorption measurements using improved hollow-core photonic-bandgap fibers with low loss in the range 3-3.6 μm. The sensitivity levels, unprecedented for a fiber-based sensor system, were achieved by addressing the strong mid-IR vibrational bands through use of a high-intensity supercontinuum source and by exploiting long interaction lengths in the HC-PBGFs. We measured mixtures of methane (1034 ppm) and ethane (50.4 ppm) and attained 7 and 0.9 ppm sensitivities for 0.925 and 5.69 m long HC-PBGF samples, respectively, from high-resolution (0.2 nm) spectra. Significant scope for further sensitivity improvement exists through use of longer fibers in combination with more sophisticated sensing schemes.
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M. N. Petrovich, M. N. Petrovich, A. M. Heidt, A. M. Heidt, N. V. Wheeler, N. V. Wheeler, N. K. Baddela, N. K. Baddela, D. J. Richardson, D. J. Richardson, } "High sensitivity methane and ethane detection using low-loss mid-IR hollow-core photonic bandgap fibers", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91573P (2 June 2014); doi: 10.1117/12.2057842; https://doi.org/10.1117/12.2057842
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