BACKGROUND NOISE CORRECTION IN QUADRUPOLE MASS SPECTROMETERS
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United States of America Patent
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Issued Date -
Jan 17, 2013
app pub date -
Oct 31, 2011
filing date -
Jul 15, 2011
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Abandoned
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Abstract
In a quadrupole mass spectrometer, which measures ion currents of a single mass with substantially constant RF and DC voltages during a measuring period and measures ions of different masses by varying the RF and DC voltages, a statistical evaluation is performed during data acquisition by a determination of the distribution of the measured and digitized noise values around an average noise level in the mass spectrometer output signal. The determined noise levels are subtracted from the signal output values separately for each measurement period.
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