Resonant Cars Detection of Hydroxyl Radicals.
Abstract
Research being perfomed under this contract is directed toward extending the proven CARS diagnostic technique, presently limited to majority species in combustion, to minority species, through the use of resonantly enhanced CARS. Measurements will be made on the OH radical in a flame. Two tunable, narrowband dye lasers, simultaneously driven by a pulsed, frequency-doubled neodymium-YAG laser have been assembled and tested. Conversion of the dye laser fundamental frequency into UV, required for resonance excitation of OH, has been achieved for both systems. Moreover, an automatic tracking frequency doubling device which maintains constant UV power output as the fundamental frequency is tuned, has been installed on one of the dye lasers. A fine-scale, multielement diffusion burner using either H2/O2 or CH4/O2 has been tested for stability and uniformity. OH emission spectra have been observed for the 0-0 and 1-0 bands of the doublet pie 3/2 - doublet sigma 1/2 system. The search for resonant CARS in the OH radical is underway.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1982
- Accession Number
- ADA122329
Entities
People
- James F. Verdieck
Organizations
- United Technologies Corporation