| 摘要 |
A mass spectrometry system includes a quadrupole, a quadrupole control, an ion detector and a controller with an ion detector protection module. The ion detector protection module monitors an output signal of the ion detector and when an accumulation of the output signal derived from receiving ions of a particular mass exceeds a threshold, the protection module causes the controller to prevent the ion detector from receiving more ions of that particular mass. In one implementation, when the threshold is exceeded, the protection module causes the controller to signal the quadrupole control to change the DC voltage so that ions are prevented from passing into the ion detector for the remainder of the SIM period. Accuracy is maintained at high signal levels by integrating long enough to get an accurate measurement. Because the signal level is large, only a short integration time is needed to achieve the measurement accuracy.
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