Method of detection of alien matter contents in gases

Chemistry: analytical and immunological testing – Measurement of electrical or magnetic property or thermal... – Of an ionized gas

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73 3102, 73 3103, 73 3105, 250382, 2503851, 250387, 324464, 324469, G01N 2171

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active

055433316

ABSTRACT:
The objective of the invention is a method for detection of alien matter contents in gas, in which method the gas and the substances contained in it are ionized in an ionization room (1). By the present methods impurities in gases cannot be determined fast and in small concentrations. In the method of the invention the ions contained in the gas are separated in a separation section (2) into positive and negative ions, of which at least the ions of either sign are led into a narrow analyzer channel (4). There, due to the capillary force, they are forced to move in the middle section of the channel, from where they are deflected by electric fields of different strength caused by different voltages (U1-U10) into an electrode located at the edge of the channel, where they cause ion current (I1-I10). On the basis of ion currents a current spectrum is made, on the basis of which different substances are detected and their concentrations determined with the aid of corresponding spectra obtained with standard samples of different substances.

REFERENCES:
patent: 2422264 (1947-06-01), Seaman
patent: 4445038 (1984-04-01), Spangler et al.
patent: 5047723 (1991-09-01), Puumalainen
patent: 5227628 (1993-07-01), Turner

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