Methane detection at 1670-nm band using a hollow-core photonic bandgap fiber and a multiline algorithm
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AuthorCubillas de Cos, Ana María; Silva López, Manuel; Lázaro Urrutia, José Miguel; Conde Portilla, Olga María; Petrovich, Marco N.; López Higuera, José Miguel
The long interaction pathlengths provided by hollow-core photonic bandgap fibers (HC-PBFs) are especially advantageous for the detection of weakly absorbing gases such as methane (CH4). In this paper, we demonstrate methane sensing with a 1670-nm band HC-PBF. A multiline algorithm is used to fit the R(6) manifold (near 1645 nm) and, in this way, to measure the gas concentration. With this method, a minimum detectivity of 10 ppmv for the system configuration was estimated.
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