Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Patent
1993-02-18
1994-12-06
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
250286, 250423P, B01D 5944, H01J 4900
Patent
active
053713648
ABSTRACT:
A system for signalling the presence of selected ion species in a gaseous sample of an ion mobility sensor, having a unidirectional field provided between first and second electrodes positioned a selected distance apart. 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. The ions then arrive at the second electrode at a time t.sub.2. A transimpedance amplifier converts the ion charges to voltage signals. The presence of selected ion species is determined by circuitry that is activated by the trigger controller at t.sub.2. The species are preferably analyzed by directing the amplifier output to an analog to digital converter and then to a digital signal processor. The ions may alternatively be analyzed by generating a logic pulse representing a selected ion species when the amplifier output exceeds a preset value. An alarm signal is output when the logic pulse is coincident at an AND gate with a logic pulse representing the species' travel time from the first electrode to the second electrode.
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Davies David K.
Zomp John M.
Anderson Bruce C.
Thermo King Corporation
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