Cardio Vascular Health
(Miguel Tejada)
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 [N.sub.2] 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.
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