Researchers　in　Southwest　Research　Institute　and　OXIGRAF　Company　have　designed　the　airborne　oxygen　sensor　for　aircraft　inerting　system.　At　present,　the　research　on　related　fields　in　China　is　still　in　the　blank　state.　The　real-time　and　accurate　detection　of　oxygen　concentration　is　the　key　problem　to　protect　the　explosion　of　aircraft　fuel　tank.　Therefore,　we　designed　2f/1f　wavelength　modulation　spectroscopy　method　for　Airborne　Tunable　Diode　Laser　Absorption　Spectroscopy　(TDLAS)　Oxygen　Sensor　with　EMD-Savitzky-Golay　Filtering.　First,　raw　signals　are　demodulated　into　first　harmonic(1f)　and　second　harmonic(2f)　signals.　In　order　to　eliminate　interference,　smooth　the　signal,　1f　and　2f　were　filtered　by　EMD-Savitzky-Golay　algorithms　respectively.　The　signals　were　reconstructed　effectively　by　using　the　the　accuracyand　stability　of　the　system　are　both　improved.　Finally,　the　1f　normalization　2f　method(WMS-2f/1f)　was　developed　to　reduce　the　influence　of　light　intensity　signal　attenuation.　The　prototype　is　designed　and　the　platform　is　built.　The　results　show　that　EMD-savitzky-Golay　filter　can　improve　the　signal-to-noise　ratio,　expand　the　measurement　range　and　detection　limit.　©　2022　IET　Conference　Proceedings.　All　rights　reserved.