Ionization devices

Details Ionization devices Ionization devices

2006-05-16

2006-05-16

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Using ionization effects

C324S464000

Reexamination Certificate

active

07046012

ABSTRACT:
An ionization detector includes a third (fence) electrode (55) between the counter electrode (53) and the sensing electrode (54). The fence electrode (53) is maintained at or near the potential of the sensing electrode (54) and traps charge movement (electrolytic current) along the detector walls associated with condensation and/or contamination within the detector. In a photoionisation detector, the fence electrode is also adapted to trap photo-induced current originating from the cathode (53).Current drawn from the fence electrode (53) provides a measure of the degree of contamination or condensation within the detector and of lamp efficiency.

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