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Investigations of coherent anti-Stokes Raman spectroscopy /CARS/ for combustion diagnosticsInvestigations of coherent anti-Stokes Raman spectroscopy (CARS) in a variety of flames are presented. Thermometry has received the primary emphasis in these studies, but species spectral and sensitivity studies will also be described. CARS is generated by mixing a 10 pps, frequency-doubled neodymium 'pump' laser with a spectrally broadband, laser-pumped, Stokes-shifted dye laser. This approach obviates the requirement to frequency scan the dye laser and generates the entire CARS spectrum with each pulse permitting, in principle, instantaneous measurements of medium properties. CARS spectra of N2, CO, O2, H2O, CO2 and CH4 in flames will be presented. In general these spectra exhibit very good agreement with computer synthesized spectra and permit measurements of temperature and species concentration. To illustrate the applicability of CARS to practical combustion diagnostics, CARS signatures from N2 have been employed to map the temperature field throughout a small, luminous, highly sooting propane diffusion flame
Document ID
19790039514
Document Type
Conference Paper
Authors
Eckbreth, A. C.
(United Technologies Corp. East Hartford, CT, United States)
Hall, R. J.
(United Technologies Corp. East Hartford, CT, United States)
Shirley, J. A.
(United Technologies Research Center East Hartford, Conn., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Subject Category
Instrumentation And Photography
Report/Patent Number
AIAA PAPER 79-0083
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting
Location: New Orleans, LA
Start Date: January 15, 1979
End Date: January 17, 1979
Sponsors: Astronautics, American Institute of Aeronautics
Accession Number
79A23527
Funding Number(s)
PROJECT: PROJECT SQUID
CONTRACT_GRANT: NAS1-15491
OTHER: EPA-68-02-2176
Distribution Limits
Public
Copyright
Other

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