Capillary-discharge based detector for chemical vapor...

Details Capillary-discharge based detector for chemical vapor... Capillary-discharge based detector for chemical vapor...

2005-05-31

2005-05-31

Trieu, Van T. (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S633000, C423S210000, C250S339030

Reexamination Certificate

active

06900734

ABSTRACT:
A handheld/portable detector for chemical vapor monitoring includes a housing and a discharge chamber that is established therein. The plasma discharge has a relatively small volume, e.g., in the micro-liter range. A first electrode and a second electrode are disposed within the discharge chamber and a discharge gap is established therebetween. A sample gas tube is in fluid communication with the discharge chamber and provides a sample gas to the discharge chamber. Also, a plasma gas tube is in fluid communication with the discharge chamber and provides a plasma gas thereto. Accordingly, the plasma gas can be used to maintain microplasma discharge between the electrodes and the sample gas can be introduced into the microplasma discharge. A spectrometer optically connected to the handheld/portable detector is used to measure the radiation emitted by the sample gas when subjected to the microplasma discharge.

REFERENCES:
patent: 3951607 (1976-04-01), Fraser
patent: 4413185 (1983-11-01), Leveson et al.
patent: 4509855 (1985-04-01), Gay
patent: 4851683 (1989-07-01), Yang et al.
patent: 5283800 (1994-02-01), Suzuki et al.
patent: 6225633 (2001-05-01), Sun et al.
patent: 6818193 (2004-11-01), Christodoulatos et al.

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