An instrument has been designed and built to monitor the concentration of SO2 in the exhaust of mobile sources. A grating assembly disperses the ultraviolet energy from a deuterium-arc source and passes five narrow spectral intervals. Three of the intervals (set A) coincide with strong absorption features in the SO2 band near 3000 A;the other two intervals (set B) coincide with weak absorption. A spinning reticle alternately transmits energy passing through set A and B to a photomultiplier detector. A dc output signal proportional to the concentration of SO2 in the sample cell is produced by appropriate electronics. A pump and manifold assembly permit operation over a wide range of sample flow rates. At high flow rates, the 90 % sample turn-over time is approximately 0.7 sec. The sample cell contains a multiple-pass optical system adjusted to 12 passes, giving a sample path length greater than 5 m. The rms noise level corresponds to approximately 0.05 ppm of SO2 when the electronic time constant is 1 sec. (DePo)


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    Titel :

    Development of an SO2 monitor for mobile sources


    Weitere Titelangaben:

    Entwicklung eines Ueberwachungssystems fuer die Schwefeldioxidemission mobiler Abgasquellen


    Beteiligte:
    Burch, D.E. (Autor:in) / Davila, P.S. (Autor:in) / Gates, F.J. (Autor:in) / Pembrook, J.D. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1979


    Format / Umfang :

    50 Seiten


    Medientyp :

    Report


    Format :

    Print


    Sprache :

    Englisch






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