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Proceedings Paper

Photonic bandgap fiber optical correlation spectroscopy gas sensor
Author(s): A. van Brakel; E. Austin; C. Grivas; M. N. Petrovich; D. J. Richardson
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Paper Abstract

We present results obtained from the first all-fiber, lensless, optical correlation spectroscopy gas sensor for acetylene (C2H2). In the reported sensing configuration, hollow-core photonic bandgap fiber (PBGF) is employed to contain all gas samples required for optical absorption measurements. This sensor relies upon comparison of the absorption spectrum of acetylene held in a 'reference gas cell' to that of a gas sample under test, which is contained in the 'measurement gas cell'. Ingress of the test gas mixture into the measurement cell is achieved via femtosecond laser-machined micro-channels running from the surface of the PBGF to its hollow core. Stable, lensless optical interrogation of the measurement cell is guaranteed by means of arc fusion splices to standard (solid-core) single-mode fiber (SMF). The reference cell is filled with acetylene at atmospheric pressure, and is permanently sealed at both ends by splices to SMF. Therefore, being constructed entirely from optical fiber, both the reference and measurement gas cells are inherently compact and coilable, and dispense with the need for lenses or other free-space optics for connection to the correlation spectroscopy system. We quantify the acetylene concentration of various test gas mixtures and compare our sensor's measured results with computer simulations.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70046A (16 May 2008); doi: 10.1117/12.786114
Show Author Affiliations
A. van Brakel, Univ. of Southampton (United Kingdom)
E. Austin, Univ. of Southampton (United Kingdom)
C. Grivas, Univ. of Southampton (United Kingdom)
M. N. Petrovich, Univ. of Southampton (United Kingdom)
D. J. Richardson, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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