Low-pressure water-cooled inductively coupled plasma torch

Details Low-pressure water-cooled inductively coupled plasma torch Low-pressure water-cooled inductively coupled plasma torch

1984-02-16

1988-12-27

Paschall, M. H.

Electric heating

Metal heating

By arc

21912151, 21912149, 2191215, 31511151, B23K 900

Patent

active

047942304

ABSTRACT:
An inductively coupled plasma torch is provided which comprises an inner tube, including a sample injection port to which the sample to be tested is supplied and comprising an enlarged central portion in which the plasma flame is confined; an outer tube surrounding the inner tube and containing water therein for cooling the inner tube, the outer tube including a water inlet port to which water is supplied and a water outlet port spaced from the water inlet port and from which water is removed after flowing through the outer tube; and an r.f. induction coil for inducing the plasma in the gas passing into the tube through the sample injection port. The sample injection port comprises a capillary tube including a reduced diameter orifice, projecting into the lower end of the inner tube. The water inlet is located at the lower end of the outer tube and the r.f. heating coil is disposed around the outer tube above and adjacent to the water inlet.

REFERENCES:
patent: 3296410 (1967-01-01), Hedger
patent: 3467471 (1969-09-01), Greenfield et al.
patent: 3514604 (1970-05-01), Grojear
patent: 3635561 (1972-01-01), Bordonati et al.
patent: 3694618 (1972-09-01), Poole et al.
patent: 3731047 (1973-05-01), Mullen et al.
patent: 3958883 (1976-05-01), Turner
patent: 4225235 (1980-09-01), Anderson et al.
patent: 4266113 (1981-05-01), Denton et al.
patent: 4293220 (1981-10-01), Denton et al.

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