Abstract
Double-layer fiber optic sensors have been fabricated and tested for hydrogen (H 2 ) gas at room temperature. The optical fiber was coated with a palladium/silica (Pd/SiO 2 ) sensing layer and a zeolite nano-blocks filter layer. The sensors demonstrated clear sensitivity to a broad range of H 2 concentrations. The selectivity study was focused on methane (CH 4 ) and carbon monoxide (CO). It was found that CH4 had no influence on the sensing response while the filter layer minimized the CO interference. The double-layer sensors are, thus, potentially useful for online monitoring of dissolved H2 in power transformers and other electrical grid assets which utilize insulation oils.
Published Version
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