Ion mobility spectrometer
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United States of America Patent
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Jan 10, 1989
Grant Date -
N/A
app pub date -
Dec 24, 1987
filing date -
Dec 24, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ion mobility spectrometer is described incorporating an air mixer having a clean air inlet and a sample air inlet, an ion mobility spectrometer cell for generating reaction ions and sample ions which are subsequently measured in a drift region, a first circuit for measuring the reactant ion peak and the sample ion peak, a second circuit for generating a feedback control signal to the air mixer in response to the reactant ion peak and a third circuit for generating a signal indicative of concentration of the sample molecules in sample air at the inlet utilizing the sample ion peak and the feedback control signal to the air mixer. The invention overcomes the problem of limited dynamic range due to saturation of the ion mobility spectrometer cell.
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