High sensitivity methane and ethane detection using low-loss mid-IR hollow-core photonic bandgap fibers

M. N. Petrovich; A. M. Heidt; N. V. Wheeler; N. K. Baddela; D. J. Richardson

doi:10.1117/12.2057842

2 June 2014 High sensitivity methane and ethane detection using low-loss mid-IR hollow-core photonic bandgap fibers

M. N. Petrovich, A. M. Heidt, N. V. Wheeler, N. K. Baddela, D. J. Richardson

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.

Citation Download Citation

M. N. Petrovich, A. M. Heidt, N. V. Wheeler, N. K. Baddela, and 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); https://doi.org/10.1117/12.2057842

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