H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 49/02 (2006.01) G01N 25/56 (2006.01) G01N 27/64 (2006.01)
Patent
CA 2291546
A method is provided for monitoring the concentration of water vapour in an ion mobility spectrometer which measures the drift time of a selected ion, having a tendency to form clusters of water molecules. As these clusters are formed, the drift time of the ion varies, and by monitoring this variation in drift time, a measure of the concentration of water vapour can be made. If this exceeds a certain level, a warning can be given and/or the instrument disabled. Preferably, a comparison is made between two different ions, one having at least a moderate tendency to form clusters with water molecules, and the other having a weak tendency to form such clusters. By comparing the two drift times, a relatively accurate determination of water concentration can be made, and this can automatically allow for variations of drift times due to other causes.
Danylewych-May Ludmila
Kuja Frank
Barringer Research Limited
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Smiths Detection - Toronto Ltd.
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