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Proceedings Paper

Oxygen detection system consisting of a millimeter wave Fabry-Pérot resonator and an integrated SiGe front-end
Author(s): Julia Wecker; Andreas Bauch; Steffen Kurth; Gauri Mangalgiri; Markus Gaitzsch; Marco Meinig; Thomas Gessner; Ismail Nasr; Robert Weigel; Dietmar Kissinger; Angelika Hackner; Ulrich Prechtel
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Paper Abstract

Oxygen shows significant absorption lines in the millimeter wave spectrum. Resonators are widely used to achieve a strong absorption even with a short absorption paths length for concentration measurements. A sensor system based on a Fabry-Pérot resonator for oxygen measurements at ambient pressure is presented here. The Fabry-Pérot resonator consists of two metal mirrors with a diameter of 50 mm. For purpose of oxygen detection the resonator covers a frequency range between 55 GHz and 65 GHz with a resonant peak density between 1 GHz and 1.5 GHz, depending on the mirror distance, and a quality factor of approximately 7000. To achieve a compact sensor system the concept envisages two integrated transceiver circuits directly coupling to coaxial ports in the metal mirrors of the resonator. The integrated SiGe front-end addresses a frequency band from 50 GHz to 75 GHz. They are realized as heterodyne structures with integrated directional couplers, thus it is possible to measure scattering parameters. For first oxygen concentration measurements, the resonator sample was coupled to a commercially available Vector Network Analyzer. The cavity was filled with oxygen concentrations of 0% vol. and 20% vol. at ambient pressure and temperature resulting in a significant change of the quality factor for frequencies close to the oxygen absorption line at 60.6 GHz. The sensor does not contain hot components. This is an advantage compared to other oxygen sensors, like electrochemical or metal-oxide sensors.

Paper Details

Date Published: 25 February 2016
PDF: 12 pages
Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 97470C (25 February 2016); doi: 10.1117/12.2210915
Show Author Affiliations
Julia Wecker, Fraunhofer-Institut für Elektronische Nanosysteme (Germany)
Andreas Bauch, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Steffen Kurth, Fraunhofer-Institut für Elektronische Nanosysteme (Germany)
Gauri Mangalgiri, Fraunhofer-Institut für Elektronische Nanosysteme (Germany)
Markus Gaitzsch, Technische Univ. Chemnitz (Germany)
Marco Meinig, Fraunhofer-Institut für Elektronische Nanosysteme (Germany)
Thomas Gessner, Fraunhofer-Institut für Elektronische Nanosysteme (Germany)
Technische Univ. Chemnitz (Germany)
Ismail Nasr, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Robert Weigel, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Dietmar Kissinger, Friedrich-Alexander Univ. Erlangen-Nürnberg (Germany)
Angelika Hackner, Airbus Group Innovations (Germany)
Ulrich Prechtel, Airbus Group Innovations (Germany)

Published in SPIE Proceedings Vol. 9747:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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