Plasma excitation system

Details Plasma excitation system Plasma excitation system

1985-01-09

1986-12-16

Fields, Carolyn E.

Radiant energy

Electrically neutral molecular or atomic beam devices and...

356316, H01S 100

Patent

active

046298878

ABSTRACT:
A radio frequency excitor apparatus and method produce an inductively coupled plasma to heat an analytic sample. The apparatus includes a radio frequency generator mechanism for producing electrical power of selected radio frequency. The generator mechanism has a power output tuning mechanism comprised of at least one output tuning inductor for determining the generator radio frequency. A separate plasma load circuit is coupled to the generator mechanism and is comprised of a work coil and a series connected, impedance matching capacitor. The work coil is adapted to produce an inductively coupled plasma and the capacitor is adapted to substantially balance the combined inductive reactances of the work coil and plasma. A control mechanism for controlling the power input into the plasma load circuit stabilizes the plasma.

REFERENCES:
patent: 3309564 (1967-03-01), Poulsen
patent: 3467471 (1969-09-01), Greenfield et al.
patent: 3958883 (1976-05-01), Turner
patent: 4293220 (1981-10-01), Denton et al.
P. W. J. M. Boumans et al., "A Stabilized R.F. Argon-Plasma Torch for Emission Spectroscopy" (Phillips Tech Rev. 33, 50-59, 1973, No. 2).
S. Greenfield et al., "Automatic Multi-Samples Simultaneous Multi-Element Analysis with a H.F. Plasma Torch and Direct Reading Spectrometer", (Analytica Chimica Acta 74 (1975), 225-245).
J. Schmitz, "Design of an Inductively Coupled Plasma Source for Emission Spectrometry", (G.A.M.S., Paris, 31st May 1977).
Peter zur Nedden, "Experiences with a 50 MHz Free Running ICP Generator", Colloquium Spectroscopium International, Prague, Czechoslovakia, Sep. 1977, (Phillips Bulletin).
Arcs & Sparks (Ultra Carbon Corporation), Jun. 1969, vol. 14, No. 1, pp. 8-10; Specification Sheets, Radyne Limited, England (1966); Specification Sheet; Kontron Material-und Strukturanalyze GmbH.

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