Photoelectric ion source photocathode regeneration system

Details Photoelectric ion source photocathode regeneration system Photoelectric ion source photocathode regeneration system

2005-10-12

2009-08-18

Nguyen, Kiet T (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S287000, C250S42300F, C250S42300F

Reexamination Certificate

active

07576320

ABSTRACT:
An explosive detection system based on an ion mobility spectrometer detects the presence of trace molecules in air. Such instruments require an ion source to ionize the trace molecules. An ion source that does not require a radioactive source to operate can use the photoelectric effect to produce electrons. Such a photoelectric ion source will gradually be contaminated and lose its photoelectron emission properties when operated in the air. The photocathode of the ion source can be automatically regenerated by a heater in thermal communication with the photocathode. The heater may be activated when the photoelectron emission falls below a predetermined value ro may run or cycle continuously.

REFERENCES:
patent: 4476392 (1984-10-01), Young

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