Development of multipoint vibrational coherent anti-Stokes Raman spectroscopy for flame applications

Applied Optics
Mikael AfzeliusAlfred Kurtz

Abstract

A novel technique for coherent anti-Stokes Raman spectroscopy (CARS) measurements in multiple points is presented. In a multipass cavity the pump and Stokes laser beams are multiply reflected and refocused into a measurement volume with an adjustable number of separated points along a line. This optical arrangement was used in a vibrational CARS setup with planar BOXCARS phase-matching configuration. The CARS spectra from spatially separated points were recorded at different heights on a CCD camera. Measurements of temperature profiles were carried out in the burned gas zone of a premixed one-dimensional flame to demonstrate the applicability of this method for temperature measurements in high-temperature regions. The ability to measure in flames with strong density gradients was demonstrated by simultaneous measurements of Q-branch spectra of N2 and CO in a Wolfhard-Parker burner flame. Interference phenomena found in multipoint spectra are discussed, and possible solutions are proposed. Merits and limitations of the technique are discussed.

Citations

Feb 13, 2010·Applied Spectroscopy·Paul R MedwellGraham J Nathan
Mar 12, 2010·Applied Optics·Qing N ChanGraham J Nathan
Feb 20, 2009·Applied Optics·Paul R MedwellGraham J Nathan
Jul 11, 2021·The Review of Scientific Instruments·Anand SankaranarayananNeeraj Kumbhakarna

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