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首页> 外文期刊>Optics Letters >Simultaneous measurement of partial pressure of O_(2) and CO_(2) with a hybrid interferometer
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Simultaneous measurement of partial pressure of O_(2) and CO_(2) with a hybrid interferometer

机译：用混合干涉仪同时测量O_（2）和CO_（2）的分压

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摘要

In this Letter, a hybrid interferometer for simultaneous measurement of the partial pressures of O_(2) and CO_(2) mixtures is reported. The sensing head consists in the combination of two interferometric structures, one a Fabry-Perrot cavity and the other a modal interferometer. The intrinsic Fabry-Perot 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-Perot. 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 CO_(2) and O_(2) with rms deviations of approx +-48.7 kPa and approx +- 20.1 kPa, respectively.
机译：在这封信中，报告了一种混合干涉仪，用于同时测量O_（2）和CO_（2）混合物的分压。传感头由两种干涉结构组成，一种是法布里-珀罗腔，另一种是模态干涉仪。固有的Fabry-Perot是通过将具有渐变折射率光纤长度的单模光纤拼接起来，然后对其进行化学蚀刻而形成的。第二个干涉仪基于与Fabry-Perot串联的纯硅胶管的接头。对于一种特定的气体，观察到其折射率随压力的变化以特定的方式变化，该特性允许同时测量rms偏差约为+ -48.7 kPa和rms偏差的CO_（2）和O_（2）的分压。分别约为±20.1kPa。

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