Accession Number : ADA083492


Title :   Conceptual Design Study for Coherent Anti-Stokes Raman Spectroscopy (CARS) Diagnostics in the AMMRC Ballistic Compressor Facility.


Descriptive Note : Final rept. Jul-Nov 79,


Corporate Author : UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CONN


Personal Author(s) : Shirley,John A ; Hall,Robert J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a083492.pdf


Report Date : Mar 1980


Pagination or Media Count : 58


Abstract : A conceptual design of a diagnostic system using coherent anti-Stokes Raman Spectroscopy (CARS) to determine time resolved temperature and species concentrations in the Army Mechanics and Materials Research Center ballistic compressor has been formulated. Performance calculations have been carried out for hydrogen which is an ideal diagnostic species for this application. Results are also presented of computer code calculations of collision narrowed spectra of nitrogen. Several pump laser systems were compared, and a high repetition frequency Nd:YAG laser was determined to be superior. Population saturation, stimulated Raman gain, and optical breakdown are not expected to pose severe limitations on laser intensity or measurement signal-to-noise ratios. Consideration is given to problems pertinent to operation of the ballistic compressor including compressor recoil, window deflections and generation of CARS from the test section windows. Finally, the possibility of using pulsed stimulated Raman gain spectroscopy (SRGS) as an alternative to CARS at the high densities typical of the ballistic compressor has been identified. SRGS appears to offer adequate measurement ability and possesses certain advantages over CARS. (Author)


Descriptors :   *EXPERIMENTAL DESIGN , *RAMAN SPECTROSCOPY , *COHERENCE , YAG LASERS , MEASUREMENT , HIGH FREQUENCY , COMPUTATIONS , COMPUTERS , PERFORMANCE(ENGINEERING) , INTENSITY , NITROGEN , HYDROGEN , PULSES , HIGH DENSITY , DIAGNOSTIC EQUIPMENT , COMPRESSORS , BALLISTICS


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE