Enhanced spontaneous Raman scattering and gas composition analysis using a photonic crystal fiber.
Spontaneous gas-phase Raman scattering using a hollow-core photonic bandgap fiber (HC-PBF) for both the gas cell and the Stokes light collector is reported. It was predicted that the HC-PBF configuration would yield several hundred times signal enhancement in Stokes power over a traditional free-space configuration because of increased interaction lengths and large collection angles. Predictions were verified by using nitrogen Stokes signals. The utility of this system was demonstrated by measuring the Raman signals as functions of concentration for major species in natural gas. This allowed photomultiplier-based measurements of natural gas species in relatively short integration times, measurements that were previously difficult with other systems.
Buric
Michael P
MP
National Energy Technology Laboratory, 3610 Collins Ferry Road, Morgantown, West Virginia 26507, USA.
Chen
Kevin P
KP
Falk
Joel
J
Woodruff
Steven D
SD