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  • 1
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    Low Cost Solar Array Project: Composition Measurements by Analytical Photon Catalysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The applicability of the photon catalysis technique for effecting composition analysis of silicon samples was assessed. Third quarter activities were devoted to the study of impurities in silicon matrices. The evaporation process was shown to be congruent; thus, the spectral analysis of the vapor yields the composition of the bulk sample. Qualitative analysis of metal impurities in silicon was demonstrated e part per million level. Only one atomic spectral interference was noted; however, it is imperative to maintain a leak tight system due to chemical and spectral interferences caused by the presence of even minute amounts of oxygen in the active nitrogen afterglow.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158737 , DOE/JPL-955201-79/3 , JPL-9950-114 , QR-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The application of laser induced predissociation fluorescence to the measurement of vibrational temperatures in a shock layer flow (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Single shot spatially and spectrally resolved laser induced predissociation fluorescence measurements in a shock layer around a cylinder in a pulsed supersonic free stream are presented. Fluorescence signals were produced using the tuned output of an argon fluoride excimer laser to excite a mixture of rovibrational transitions in molecular oxygen. The signals produced along a line inside the shock layer were focussed onto a two dimensional detector coupled to a spectrometer, thus allowing spectral and spatial resolution of the fluorescence. In this way, it was possible to detect two fluorescence signals from two different transitions simultaneously, allowing the determination of vibrational temperatures without the need for calibration. However, to minimize problems associated with low signal to noise ratios, background subtraction and spatial averaging was required. The experimental measurements are compared with theoretical inviscid shock layer calculations for nonequilibrium air. A description of the strategies employed in these calculations is also provided.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 93-3071 , ; 11 p.|AIAA, Fluid Dynamics Conference; Jul 06, 1993 - Jul 09, 1993; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Low cost solar array project: Composition measurements by analytical photon catalysis (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The applicability of the photon catalysis technique for effecting composition analysis of silicon samples is assessed. In particular, the technique is to be evaluated as a detector for the impurities Al, Cr, Fe, Mn, Ti, V, Mo and Zr. During the first reporting period Al, Cr, Fe and Mn were detected with the photon catalysis method. The best fluorescence lines to monitor and determined initial sensitivities to each of these elements by atomic absorption calibration were established. In the course of these tests, vapor pressure curves for these four pure substances were mapped.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158086 , DOE/JPL-955201-78/1 , QR-1
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    NASA TECHNICAL REPORTS
  • 4
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    Low Cost Solar Array Project: Composition Measurements by Analytical Photo Catalysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The applicability of the photon catalysis technique for effecting composition analysis of silicon samples is discussed. A detector for the impurities Al, Cr, Fe, Mn, Ti, V, Mo and Zr is evaluated. During the first reporting period Al, Cr, Fe, and Mn were detected with the photon catalysis method. The best fluorescence lines to monitor and determine initial sensitivities to each of these elements by atomic absorption calibration were established. In the course of these tests vapor pressure curves for these four pure substances were also mapped. Ti and Si were detected. The best lines to monitor were catalogued and vapor pressure curves were determined. Attempts to detect vanadium were unsuccessful due to the refractory nature of this element and the limited temperature range of the evaporator.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158598 , DOE/JPL-955201-78/1 , JPL-9950-49 , QR-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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