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Proceedings Paper

Spectroscopy gas sensing based on hollow fibres
Author(s): A. Rodrigues; V. Lange; D. Kühlke
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Paper Abstract

We demonstrate gas sensing in a relatively compact sensor unit in particular for weakly absorbing gases in real time. As a proof-of-concept, we built an oxygen sensor for the A-Band at 760 nm. A VCSEL laser was used as a laser source due to its mode stability and reduced cost compared to DFB lasers and Fabry-Perot lasers. In order to reduce as much as possible the sensor size, a hollow waveguide is used to guide the light and the gas to be analysed in a long path to enhance the sensitivity of the sensor. Two different types of hollow fibres were characterised with respect to their suitability for gas sensing, a photonic crystal fibre, also known as micro-structured optical fibre, and hollow metal-coated capillaries. Characteristics as attenuation, spectral transmission properties and filling time were analysed. At the end, a sensor device with coupling and detection unit was developed. The main advantage of our set-up is the possibility of using the same design for different gases by changing solely the laser, the detector and the coupling lens.

Paper Details

Date Published: 6 May 2011
PDF: 10 pages
Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 807311 (6 May 2011); doi: 10.1117/12.886176
Show Author Affiliations
A. Rodrigues, Hochschule Furtwangen Univ. (Germany)
V. Lange, Hochschule Furtwangen Univ. (Germany)
D. Kühlke, Hochschule Furtwangen Univ. (Germany)

Published in SPIE Proceedings Vol. 8073:
Optical Sensors 2011; and Photonic Crystal Fibers V
Kyriacos Kalli; Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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