Shutoff detector for unstable plasma or combustion flame

Details Shutoff detector for unstable plasma or combustion flame Shutoff detector for unstable plasma or combustion flame

1989-04-21

1990-06-19

Paschall, M. H.

Electric heating

Metal heating

By arc

21913021, 21912157, 31511151, B23K 900

Patent

active

049355961

ABSTRACT:
A plasma flame apparatus capable of self-extinguishing in the event of an unstable plasma discharge includes an inductively coupled plasma torch for producing a plasma flame which will have an acoustical signal characteristic of an unstable plasma discharge. A power generator is coupled to the plasma torch for powering the plasma. A microphone is receptive of the acoustical signal for effecting a representative electrical signal. A comparator generates a output electrical signal when the representative signal exceeds a selected level. The output signal is coupled to the power generator of the plasma flame such as to shut off the power generator when the representative signal exceeds the selected level.

REFERENCES:
patent: 3679865 (1972-07-01), Jesnitzer et al.
patent: 4109130 (1978-08-01), Oku
patent: 4480475 (1984-11-01), Tsao et al.
patent: 4602147 (1986-07-01), Gell
patent: 4609810 (1986-09-01), O'Brien et al.
patent: 4766287 (1988-08-01), Morrisroe et al.

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