Abstract
The diode laser serves as a source of narrow-linewidth irradiation whose wavelength can be rapidly tuned to perform fast high-resoltuion absorption spectroscopy. The laser beam is passed through the soot-laden post-flame region of a laminar premixed acetylene-air flame, and the wavelength is tuned across the full width of an absorption line of a gaseous component, in this instance, CO. The modulation of laser wavelength provides a simple means of discrimination against the continuum extinction effects of particulates. The result of a single measurement is the basis for a fully resolved profile of one or more CO absorption lines from which may be inferred the CO concentration, the temperature, or the collision halfwidth of the absorption line. The primary limitation of the technique, for some applications, is that it is a line-of-sight measurement. The advantages of tunable diode laser spectroscopy include its sensitivity, simplicity, and high spectral resolution. 1 figure.
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