Electric heating – Metal heating – By arc
Reexamination Certificate
2011-03-29
2011-03-29
Paschall, Mark H (Department: 3742)
Electric heating
Metal heating
By arc
C219S121570, C219S121480
Reexamination Certificate
active
07915563
ABSTRACT:
An arc detector is provided for a plasma processing system including a HF power source, a plasma processor, and a voltage/current signal detector. The arc detector includes a calculator for the phase difference between the AC voltage signal and the AC current signal, a calculator for an effective voltage based on the AC voltage signal, a calculator for an effective current based on the AC current signal, an FFT processor for the frequency spectrum of the AC voltage or current signal, and an arc analyzer connected to the phase difference calculator, effective voltage calculator, effective current calculator, and FFT processor. The arc analyzer calculates the plasma processor's impedance based on the calculated phase difference, effective voltage, and effective current. The arc analyzer monitors arcs in the plasma processor, based on the fluctuation rate of the calculated impedance and the output level of a frequency component in the spectrum.
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Daihen Corporation
Hamre Schumann Mueller & Larson P.C.
Paschall Mark H
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