Measuring and testing – Gas analysis – Solid content of gas
Patent
1977-03-22
1979-02-20
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Solid content of gas
55270, G01N 2700
Patent
active
041400054
ABSTRACT:
A method and instrument for continuous monitoring of an aerosol as the sulfur content of atmospheric aerosols. The instrument has an electrostatic precipitator that is turned off and on at a given frequency to modulate the particle concentration of aerosol flowing through the precipitator. A total sulfur flame photometric detector sensitive to both gaseous and particulate sulfur receives a sample of the modulated aerosol from the precipitator. The modulated particle concentration of the aerosol supplied to the detector causes a fluctuating component in the detector output that is directly related to the sulfur particle concentration. This component is amplified by a frequency and phase sensitive lock-in amplifier tuned to the precipitator modulation frequency. The resulting output signal gives a continuous measure of the sulfur particle concentration entering the instrument.
REFERENCES:
patent: 2556832 (1951-06-01), Vollrath
patent: 2730005 (1956-01-01), Vonnegut
patent: 3473118 (1969-10-01), Tassicker et al.
patent: 3520172 (1970-07-01), Liu et al.
patent: 3763428 (1973-10-01), Preist
patent: 3954428 (1976-05-01), Marple et al.
Kreitman Stephen A.
The Regents of the University of Minnesota
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