Abstract
A hollow-core photonic bandgap (PBG) fiber sensing configuration for
optical absorption spectroscopy of multiple-component gas samples absent of
a vacuum environment is presented. Pressure-driven sensor response times that
are shorter in duration compared to diffusion-limited filling times for fiber
lengths ${>}1$ m
are reported. Reduced filling times that approach the sub-minute regime are
possible for a ${\sim} {\hbox
{2}}$ meter length of commercially available PBG fiber with
a 12.5 micron core diameter at a pressure ${<}15$ Psi. The spectroscopy measurements
were limited to the near-IR region for sample gases that include acetylene
and carbon dioxide. Using the techniques presented, the detection of concentrations ${<}100$ ppm for
acetylene gas at pressures ${<}15$ Psi is possible.
© 2009 IEEE
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