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  • 1
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An integrated flat-flame/ microprobe sampling quadrupole mass spectrometer system, complemented by optical spectrometry based on optical fibers, is presented. The short microprobe sampling line (total 25 cm) is directly connected to an open ion source closely flanked by two nude cryopumps (900 l/s) yielding a background pressure of 10−9 Torr and a sampling pressure of about 10−5 Torr. Due to this improved microprobe system, mass spectrometry can be used for analysis of stable species (including fuel, O2, H2O, CO2, CO, and Ar) with less disturbance of the sample than with a conventional microprobe with a back pressure of about 1 Torr. Optical spectrometry is used for the study of emission from important radical species (such as C2, CH, and OH). The system is proposed as a complement to more conventional flat-flame/MBMS systems in which the sampling cone can effect the experimental system. Details are provided concerning the configuration of the whole system ranging from gas delivery to data evaluation. Test data are presented for a 16% methanol/68% oxygen/16% argon flame studied at a pressure of 40 Torr, to elucidate the special features of this system.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2601-2605 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A rapid-scanning optical spectrometer based on fiberoptic probes, used to measure radical emission in low-pressure premixed laminar flames, is presented. Emission spectra and intensity profiles as a function of height above the burner have been recorded for OH, CH, and C2 in an ethylene/oxygen/nitrogen flame (14% C2 H4 , 64% O2 , 22% N2 ), stabilized at 5 Torr on a sintered stainless-steel burner. The emitted light was guided from the flame reactor to the spectrometer by fused silica optical fibers. Rapid scanning (100 scans/s) eliminates the effects of turbulence and temporal signal fluctuations, as 104 –105 scans over a preset spectral window are collected and signal averaged within a few minutes. The technique is discussed and compared to classical methods in flame spectroscopy.
    Type of Medium: Electronic Resource
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