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The properties of hollow\u2010core photonic crystal fibres are explored to have a sensing head with favourable characteristics for gas sensing, particularly in what concerns intrinsic readout sensitivity and gas diffusion time in the sensing structure. The sensor interrogation was performed applying the Wavelength Modulation Spectroscopy technique, and a portable measurement unit was developed with performance suitable for remote detection of low levels of methane. This portable system has the capacity to simultaneously interrogate four remote photonic crystal fibre sensing heads.<\/jats:p>","DOI":"10.1155\/2009\/398403","type":"journal-article","created":{"date-parts":[[2009,9,14]],"date-time":"2009-09-14T15:33:26Z","timestamp":1252942406000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Remote System for Detection of Low\u2010Levels of Methane Based on Photonic Crystal Fibres and Wavelength Modulation Spectroscopy"],"prefix":"10.1155","volume":"2009","author":[{"given":"J. P.","family":"Carvalho","sequence":"first","affiliation":[]},{"given":"H.","family":"Lehmann","sequence":"additional","affiliation":[]},{"given":"H.","family":"Bartelt","sequence":"additional","affiliation":[]},{"given":"F.","family":"Magalh\u00e3es","sequence":"additional","affiliation":[]},{"given":"R.","family":"Amezcua-Correa","sequence":"additional","affiliation":[]},{"given":"J. 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