| 摘要 |
This is a multichannel mass spectrometer in which gas components of a mixture sample are ionized and the ions directed respectively to different collector cups or plates to generate voltage signals corresponding to the ion currents collected. Means are provided for initially adjusting the voltage of the output signals so that each collector output circuit produces the same signal as the others at unit partial pressure of the gas component it is adapted to measure. A reference signal is supplied and means is provided for comparing it with the sum of the collector circuit output voltages. Sensitivity control means is responsive to changes in the initially adjusted relationship of the sum of the collector output signals to the reference signal and adjusts each of the collector output signals by the same factor to maintain the sum of the collector signals in the initial adjusted relationship. Thus the collector signals will be proportional to the respective gas component partial pressures despite variations in the relative proportions of the component partial pressures, and despite changes in factors which would otherwise alter the sensitivity of the spectrometer system. Detector means is also provided to indicate an excessive change in the sum of the collector signals due to restriction of the sample inlet conduit or other unusual condition.
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