Dual-channel mid-infrared sensor based on tunable Fabry-Pérot filters for fluid monitoring applications

•The development of a mid-infrared spectroscopic fluid sensor is presented.•The sensor is based on two miniaturized tunable Fabry-Pérot filters.•Spectra of deteriorated engine oil samples are measured and compared.•The wavenumber shift of the spectra is algorithmically corrected.•Multivariate method...

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