INFRARED CAVITY RINGDOWN LASER ABSORPTION SPECTROSCOPY (IR-CRLAS) IN LOW PRESSURE FLAMES
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Date
1996
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Ohio State University
Abstract
We have employed Infrared Cavity Ringdown Laser Absorption $Spectroscopy^{1}$ (IR-CRLAS) as a diagnostic tool for combustion chemistry studies. High resolution rovibrational absorption spectra have been obtained in low pressure laminar flames in the mid-infrared employing a pulsed single mode optical parametric oscillator (OPO) laser system. The high sensitivity and generality of IR-CRLAS for combustion studies is demonstrated in a variety of flames and is shown to be robust even in sooting environments with high temperature gradients. The ability to obtain spatially resolved data is also demonstrated in one dimensional laminar flame studies. These preliminary results indicate the potential of IR-CRLAS as a combustion diagnostic which is capable of obtaining absolute concentration of reactants, intermediates, and products simultaneously within a narrow spectral region. In this demonstration, two information rich mid-infrared spectral regions (1.6 and 3.4 microns) have been probed at Doppler-limited resolution with an effective laser bandwidth of $<$$0.0007 cm^{-1}$.
Description
1. J.J. Scherer, D. Voelkel, D.J. Rakestraw, J.B. Paul, C.P. Collier, and R.J. Saykally, Chem. Phys. Lett. 245, 273 (1995). This work is supported by the Basic Energy Sciences division of the Department of Energy
Author Institution: Combustion Research Facility, Sandia National Laboratories (M/S 9055)
Author Institution: Combustion Research Facility, Sandia National Laboratories (M/S 9055)