Inductively coupled plasma torch with adjustable sample injector

Details Inductively coupled plasma torch with adjustable sample injector Inductively coupled plasma torch with adjustable sample injector

1987-03-06

1988-08-23

Paschall, M. H.

Electric heating

Metal heating

By arc

31511151, 356316, 21912148, 21912154, 21912157, 21912159, B23K 900

Patent

active

047662875

ABSTRACT:
An induction plasma system comprises a torch and an induction coil. A sample substance is injected into the plasma at an axial position that is adjustable while the plasma is being energized. The plasma-forming gas flows through the induction coil prior to passing through the plasma torch. A piezoelectric crystal is used for initiating the plasma. An oscillator network generates radio frequency power at a first frequency, and an output LC network that includes the induction coil is tuned to a second frequency higher than the first frequency. Means for maintaining constant power to the plasma includes an AC circuit for duty cycling AC power input to a DC power supply in response to a feedback signal relative to the rectified voltage. Thus a change in the rectified voltage effects an inverse change in the duty cycling such as to nullify the change in the rectified voltage.

REFERENCES:
patent: Re29304 (1977-07-01), Greenfield et al.
patent: 3296410 (1967-01-01), Hedger
patent: 3324334 (1967-06-01), Reed
patent: 3648015 (1972-03-01), Fairbairn
patent: 4266113 (1981-05-01), Denton et al.
patent: 4306175 (1981-12-01), Schleicher et al.
patent: 4482246 (1984-11-01), Meyer et al.
patent: 4575609 (1986-03-01), Fassel et al.
patent: 4578560 (1986-03-01), Tanaka et al.
patent: 4629940 (1986-12-01), Gagne et al.

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