One-dimensional vibrational coherent anti-Stokes Raman-scattering thermometry.

Area of Science:

• Thermometry
• Laser Spectroscopy
• Combustion Diagnostics

Background:

• Accurate temperature measurements are crucial for understanding combustion processes.
• Previous methods often lack spatial resolution or are intrusive.
• Coherent Anti-Stokes Raman Scattering (CARS) offers a non-intrusive approach.

Purpose of the Study:

• To present quantitative, one-dimensional temperature measurements using broadband N(2) vibrational CARS.
• To demonstrate the technique's capability for measuring temperature gradients.
• To validate the method in a relevant combustion environment.

Main Methods:

• Utilized broadband N(2) vibrational Coherent Anti-Stokes Raman Scattering (CARS).
• Employed a planar BOXCARS phase-matching geometry.
• Achieved a spatial resolution of 86 mm, depending on imaging optics.

Main Results:

• Successfully performed quantitative, single-pulse temperature measurements.
• Generated CARS signal along a 6.16-mm path.
• Demonstrated applicability in a premixed laminar CH(4)-air flame.

Conclusions:

• Broadband N(2) vibrational CARS is a viable technique for quantitative temperature measurements.
• The method effectively captures temperature gradients.
• This non-intrusive technique shows promise for combustion research.