12 May 2016 Fugitive methane leak detection using mid-infrared hollow-core photonic crystal fiber containing ultrafast laser drilled side-holes
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Abstract
The increase in domestic natural gas production has brought attention to the environmental impacts of persistent gas leakages. The desire to identify fugitive gas emission, specifically for methane, presents new sensing challenges within the production and distribution supply chain. A spectroscopic gas sensing solution would ideally combine a long optical path length for high sensitivity and distributed detection over large areas. Specialty micro-structured fiber with a hollow core can exhibit a relatively low attenuation at mid-infrared wavelengths where methane has strong absorption lines. Methane diffusion into the hollow core is enabled by machining side-holes along the fiber length through ultrafast laser drilling methods. The complete system provides hundreds of meters of optical path for routing along well pads and pipelines while being interrogated by a single laser and detector. This work will present transmission and methane detection capabilities of mid-infrared photonic crystal fibers. Side-hole drilling techniques for methane diffusion will be highlighted as a means to convert hollow-core fibers into applicable gas sensors.
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Jason Karp, Jason Karp, William Challener, William Challener, Matthias Kasten, Matthias Kasten, Niloy Choudhury, Niloy Choudhury, Sabarni Palit, Sabarni Palit, Gary Pickrell, Gary Pickrell, Daniel Homa, Daniel Homa, Adam Floyd, Adam Floyd, Yujie Cheng, Yujie Cheng, Fei Yu, Fei Yu, Jonathan Knight, Jonathan Knight, } "Fugitive methane leak detection using mid-infrared hollow-core photonic crystal fiber containing ultrafast laser drilled side-holes", Proc. SPIE 9852, Fiber Optic Sensors and Applications XIII, 985210 (12 May 2016); doi: 10.1117/12.2229084; https://doi.org/10.1117/12.2229084
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