Simultaneous measurement of partial pressure of O-2 and CO2 with a hybrid interferometer

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Luis Coelho (Author) Other; Paula A R Tafulo (Author) Other; Pedro A S Jorge (Author) FCUP; Jose L Santos (Author) FCUP; Diana Viegas (Author) Other; Kay Schuster (Author) Other; Jens Kobelke (Author) Other; Orlando Frazao (Author) FCUP

Journal

Title: Optics Letters

Vol. 37

Pages: 3063-3065

ISSN: 0146-9592

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 20 Citations

Scopus - 22 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-002-7B1

DOI: 10.1364/ol.37.003063

Abstract (EN): In this Letter, a hybrid interferometer for simultaneous measurement of the partial pressures of O-2 and CO2 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 CO2 and O-2 with rms deviations of similar to +/- 48.7 kPa and similar to +/- 20.1 kPa, respectively. (C) 2012 Optical Society of America

Language: English

Type (Professor's evaluation): Scientific