Dual Frequency Comb Spectroscopy of High Temperature Water Vapor Absorption: Testing and Improving Spectral Databases for Use in Coal Gasification


Coal gasification is a promising technology for the efficient use of coal resources worldwide. The gasification process takes place at high pressures and temperatures, up to 50 bar at 1700K, so the chemical kinetics are difficult to study and not well known. These kinetics parameters are valuable for the utilization of gasification technology. In situ water vapor measurements provide a window into these processes, but require high fidelity spectral databases for the interpretation of absorption data from unknown environments. We present high resolution (0.003 cm-1), broadband (353 cm-1) measurements of water vapor in a controlled high temperature optical cell up to 1300K using fully resolved dual frequency comb spectroscopy referenced to the NIST atomic frequency standard. The measurements cover ~2100 measurable transitions of water vapor. The immediate uses of these measurements are two-fold – the evaluation of existing high temperature spectral databases, and the improvement of these databases through direct measurement of individual line parameters. In this talk, we will focus on a comparison of our high resolution data to ideal models generated from the HITEMP2010 and HITRAN2012 databases.

Jul 14, 2015 3:30 PM — 4:30 PM
Bechtel Collaboratory, Discovery Learning Center
Engineering Center, University of Colorado at Boulder, Boulder, CO 80309

University of Colorado Boulder