| 摘要 |
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.
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