In this Letter, a hybrid interferometer for simultaneous measurement of the partial pressures of and mixtures is reported. The sensing head consists in the combination of two interferometric structures, one a Fabry–Pérrot cavity and the other a modal interferometer. The intrinsic Fabry–Pérot was formed by splicing a single mode fiber with a graded index fiber length that was then subjected to chemical etching creating an air cavity. The second interferometer is based on a splice of a pure silica tube in series with the Fabry–Pérot. It was observed for a particular gas that its refractive index changes with pressure variation in a specific way, a characteristic that permitted the simultaneous measurement of partial pressures of and with rms deviations of and , respectively.
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