G - Physics – 01 – N
Patent
G - Physics
01
N
358/21
G01N 27/66 (2006.01) G01N 27/64 (2006.01)
Patent
CA 1245377
ABSTRACT A method for detecting very small concentrations of gases in gas mixtures passed as a gas stream through a measur- ing cell having a chamber through which the gas stream flows through, a drift zone provided between an inlet and an outlet of the chamber, a gas stream ionizing radiation source located at the inlet of the drift zone, a collector electrode located at the outlet of the drift zone, a grid consisting of two groups of parallel wires located in the drift zone, including the steps of inducing the movement of the ions through the drift zone by means of a ventilator which generates a con- trolled gas flow to the collector electrode, periodically changing the frequency of the AC voltage supplied to the groups of grid wires either continuously or stepwise, simul- taneously measuring the collector current dependent on the grid frequency, digitizing and storing the measured collector current in a memory as a function of the frequency, storing in a further memory a table of collector current/frequency curves for different gases, comparing the measured curves with the stored curves and, if a measured curve is identical with one of the stored curves, producing an indication signal char- acterizing the gas corresponding to the particular stored curve. An apparatus for measuring a gas concentration is pro- vided using this method.
529654
Biehl Karl-Ernst
Tyssen Egon
von Roedern Conrad G.
Honeywell-Elac-Nautik G.m.b.h.
Smart & Biggar
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