| 摘要 |
A technique for measuring analyte concentration and a modulated aspiration condenser capable of performing this technique. The method for detecting the analyte comprises first collecting and ionizing a gas sample including the analyte in which the concentration of the analyte is high enough to completely saturate ionization process. The ion mobilities of ions contained in the ionized gas sample are determined. On the basis of the mobilities, a concentration of the analyte in the gas sample is determined. The modulated ion mobility detector comprises an ionizer ionizing a continuously flowing gas sample. A detection cell receives the ionized gas sample in which a reference plate and a collection electrode establish a time varying electric field in a direction transverse to the direction of flow of the gas sample in the detection cell. Ions contained in the gas sample are thereby deflected into the collection electrode. A controller detects an electric current from the collection electrode and from this information determines mobilities of the ions. It should be noted, however, that the modulated aspiration condenser itself has wider application in measuring the mobility of any ion in virtually fluid and is not limited to anesthetic gas applications.
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