Electricity: measuring and testing – Using ionization effects – For monitoring pressure
Patent
1983-11-04
1985-10-08
Levy, Stewart J.
Electricity: measuring and testing
Using ionization effects
For monitoring pressure
73 52, G01L 2134
Patent
active
045463190
ABSTRACT:
A process and apparatus for testing the degree of vacuum in an evacuated vial. For testing the vacuum, a vial is located at a source of high voltage radio frequency power and the power is applied to the vial. A momentary intense flash of light is applied to the vial to cause ionization of the gas within the vial and the ionization current of the ionized gas within the vial is then sensed and a representation of the value of the ionization current is generated. The representation of the ionized current is compared with a minimum acceptable current value which is indicative of a predetermined minimum allowable vacuum within the vial. The vial is rejected if the measured ionization current is less than the minimum acceptable current value. In one embodiment, the apparatus includes a single station for testing evacuated vials, one at a time. In another embodiment of the apparatus, a plurality of vials are conveyed in a carousel through a series of testing stations. Acceptable vials continue to a downstream location, while unacceptable vials are rejected before release from the carousel.
REFERENCES:
patent: 2734628 (1956-02-01), Schlayer
patent: 3495165 (1970-02-01), Cobine et al.
patent: 4021727 (1977-03-01), Fellows
patent: 4053814 (1977-10-01), Regan et al.
patent: 4359668 (1982-11-01), Ury
patent: 4471309 (1984-09-01), Lange et al.
Mowbray Kenneth D.
Pacholok David R.
Pfaff Ernest H.
Levy Stewart J.
Williams Hezron E.
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