van Brakel, A., Austin, E.A.D., Petrovich, Marco, Richardson, David and Dakin, John
Correlation spectroscopy gas sensor with photonic band-gap fibre reference cell.
In, EUROPT(R)ODE VIII: Eighth European Conference on Optical Chemical Biosensors, Tubingen, Germany,
02 - 05 Apr 2006.
Gas-filled microstructured optical fibres [1-4], in particular photonic band-gap fibres (PBGFs), have been suggested as a replacement for bulk-optic cells in optical gas sensors. However, the extended filling time required (~ hours) limits their usefulness in most real-world applications. Recently, sealed gas-filled fibres have been employed as fixed wavelength references for telecommunications , where filling time is no longer important.
We now demonstrate the use of a sealed gas-filled PBGF as reference cell in a high-selectivity correlation spectroscopy gas sensor. The advantages of using PBGFs in this application are:- their suitability to sensing hazardous gases (only ~1 µl.m-1 of gas is required); their capability for providing long effective path lengths (because of high overlap between the guided mode and enclosed gas, and very low fibre loss: ~0.05 dB.m-1); and the ability to produce compact gas cells by simply coiling the fibre.
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