Development, Evaluation, and Application of Line-Imaging Coherent Anti-Stokes Raman Scattering (CARS) Spectroscopy.
Abstract
Funds are requested for the development, evaluation, and application of line imaging coherent anti-Stokes Raman scattering (CARS) techniques for temperature and concentration measurements in flames. There have been a few demonstrations of line CARS with nanosecond (ns) and picosecond (ps) laser systems, but interest in the technique has definitely increased since the advent of femtosecond (fs) CARS. The use of ultrafast laser systems has opened up a wide range of possible experimental methods for line CARS measurements. However, line CARS has not been developed to the stage where it can be applied routinely in laboratory flames, and certainly not in more practical combustion systems. Both hybrid fs-ps CARS and CPP fs CARS line imaging techniques have been demonstrated, and both pure rotational and vibrational line CARS have been demonstrated, but the application of these methods is far from routine and the relative merits of the different approaches has not been the subject of a detailed investigation. The relative merits of various fs line CARS techniques will be rigorously evaluated during this research program. Along with a rigorous experimental and theoretical analysis of the strengths and weaknesses of different fs line CARS techniques, a focus of this research project will be the application of line CARS to counterflow flames, especially near extinction.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 29, 2024
- Source ID
- FA95502310289
Entities
People
- Robert Lucht
Organizations
- Air Force Office of Scientific Research
- Purdue University
- United States Air Force