Accession Number : ADA294436

Title :   Application of the Photoacoustic and Photothermal Effects to Combustion Diagnostics.

Descriptive Note : Final rept. Jun 80-Jun 86,

Corporate Author : ARKANSAS UNIV FAYETTEVILLE

Personal Author(s) : Gupta, Rajendra ; Salmo, Gregory J.

PDF Url : ADA294436

Report Date : OCT 1986

Pagination or Media Count : 99

Abstract : There is presently a need for the development of combustion diagnostic techniques to measure such parameters as gas concentrations and local temperatures in practical flames. These techniques should be non-perturbing to permit in situ measurements, have spatial resolution, and have temporal resolution. Optical techniques are best suited for this purpose since they easily satisfy all three criteria. In fact, several optical techniques have already been successfully used for specie concentration measurements, e.g., coherent anti-Stokes Raman scattering, spontaneous Raman scattering, and saturated fluorescence. However, there is currently no single technique which is suitable under all circumstances and all of the above techniques can be seen to have relative advantages and disadvantages over each other. Under the sponsorship of the United States Air Force, we have investigated the potential of the photoacoustic technique as a combustion diagnostic technique for measurement of minority species concentrations. In this report we discuss the results of this investigation. (AN)

Descriptors :   *COMBUSTION, *ACOUSTOOPTICS, *PHOTOTHERMAL PROPERTIES, SPATIAL DISTRIBUTION, LIGHT SCATTERING, TEMPERATURE, EXPERIMENTAL DATA, FLUORESCENCE, MOLECULAR SPECTROSCOPY, LASER INDUCED FLUORESCENCE, EXCITATION, RAMAN SPECTROSCOPY, RESOLUTION, DEFLECTION, SENSITIVITY, LASER BEAMS, SATURATION, OPTICAL ANALYSIS, CONCENTRATION(COMPOSITION), DIAGNOSIS(GENERAL), FUEL AIR RATIO, MOLECULE MOLECULE INTERACTIONS, TWO PHOTON ABSORPTION, FLAMES, STOKES RADIATION, OPTOACOUSTIC FILTERS, COHERENT SCATTERING, NITROGEN DIOXIDE.

Subject Categories : Acoustooptic and Optoacoustic Devices
      Combustion and Ignition
      Radiation and Nuclear Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE