Electricity: measuring and testing – Using ionization effects – For analysis of gas – vapor – or particles of matter
Patent
1983-03-01
1985-12-03
Karlsen, Ernest F.
Electricity: measuring and testing
Using ionization effects
For analysis of gas, vapor, or particles of matter
324455, G01N 2762
Patent
active
045568499
ABSTRACT:
An improved apparatus for measuring the grain-size composition of powders in which a device for transforming a powder into a gaseous flow of individual particles, a charging chamber in which each particle acquires a charge which is proportional to its surface area, a precipitating capacitor in which the flow of charged particles is separated into various fractions in accordance with the charge on the particles, an electrometric device for measuring the total charge of individual fractions are provided, the electrometric device having inductive sensors of charged particles, the number of inductive sensors being equal to the number of fractions, and an amplifier to which are connected all inductive sensors of charged particles. The improvement comprises a plurality of switching devices, one switching device being provided for each sensor. Each switching device has an input and an output, includes a sealed contact means for avoiding charge leakage from the respective sensors, and is positioned between an inductive sensor and the amplifier.
REFERENCES:
patent: 3718029 (1973-02-01), Gourdine et al.
patent: 3763449 (1973-10-01), Kimball
patent: 4286241 (1981-08-01), Olivenbaum et al.
Dubrovsky, deceased Adolf V.
Kalakutsky Lev I.
Sychenkov Vladimir V.
Vlasov Vladimir B.
Karlsen Ernest F.
O'Shea Kevin D.
Vsesojuzny Nauchno-Issledovatelsky Institut Nerudnykh Stroitelny
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