Microwave induced plasma torch with tantalum injector probe

Details Microwave induced plasma torch with tantalum injector probe Microwave induced plasma torch with tantalum injector probe

1989-06-07

1991-09-24

Paschall, M. H.

Electric heating

Metal heating

By arc

21912148, 21912151, 31511121, B23K 900

Patent

active

050515578

ABSTRACT:
A stable, low gas-flow microwave induce plasma torch for use with a helium microwave induced plasma system provides a toroidal plasma with central analyte injection obtained by the addition of a tantalum coupling probe injector. This, injector which penetrates through 100% of the total cavity depth, aids in plasma initiation, in the efficiency of power transfer to the cavity, and in eliminating the effects of a lack of homogeneity in the microwave field on analyte distribution in the plasma. In the preferred embodiment the microwave induced plasma torch includes a stainless steel body, a threaded aluminum insert, a PTFE insulator, a tantalum injector probe, and a quartz containment tube.

REFERENCES:
patent: 3296410 (1967-01-01), Hedger
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patent: 4061991 (1977-12-01), Hamid et al.
patent: 4423303 (1983-12-01), Hirose et al.
patent: 4609808 (1986-09-01), Bloyet et al.
patent: 4757237 (1988-07-01), Hellblom et al.
patent: 4833294 (1989-05-01), Montase et al.
patent: 4902099 (1990-02-01), Okamoto et al.
patent: 4933650 (1990-06-01), Okamoto

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