Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Patent
1993-02-18
1994-03-15
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
250282, H01V 4940
Patent
active
052947947
ABSTRACT:
A system for compensating for changes in pressure and temperature in an ion mobility sensor has first and second electrodes positioned a selected distance apart, with a unidirectional electric drift field provided between the electrodes. An ionization source generates ions in the sensor and a trigger controller allows ions to enter the region between the first and second electrodes at a time t.sub.1. A time t.sub.2 at which a selected ion species travels to one of the first and second electrodes is measured and a time to amplitude converter generates a voltage signal proportional to the difference between t.sub.1 and t.sub.2, representing the actual travel time of the ion species. A feedback control circuit adjusts the drift field and either the voltage pulse (in pulsed ionization) or the shutter voltage (in continuous ionization) by an amount proportional to the difference between the actual travel time voltage and a voltage proportional to a reference travel time of the selected ion species at a known pressure and temperature.
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Berman Jack I.
Moran M. J.
Thermo King Corporation
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