Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Patent
1991-03-21
1992-04-28
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
250281, H01J 4940
Patent
active
051091577
ABSTRACT:
An ion mobility detector comprising a one piece dielectric tube with conductive bands as field elements for accelerating ions formed in a reactor region of the tube and passed to a drift region of the tube under control of a gate separating the reactor region from the drift region and thence to an electrometer plate. A first d.c. voltage source provides operating voltages to the conductive bands while a separate d.c. voltage source provides operating voltages to the gate. The detector includes circuitry for varying the potential of the gate to ensure correct focusing of ions within the cell. The circuitry includes an arrangement for altering the potential of the gate. The arrangement can be automatically controlled as a function of the output of an amplifier connected to the electrometer plate.
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