Plasma generating apparatus using microwave
First Claim
1. A plasma generator, which controls for impedance matching between a microwave and plasma that occurs due to the said microwave, comprising:
- a microwave generator;
an impedance adjustment unit, which changes the impedance for a microwave given from said microwave generator, a plasma generation unit, which receives the impedance adjusted microwave, generating plasma;
a monodyne interference unit, which obtains an interference wave due to the monodyne interference between the microwave given from said microwave generator and a microwave that has reflected by said plasma; and
a control unit, which processes a signal from the monodyne interference unit and provides a matching control signal;
wherein impedance matching between the microwave and plasma is taken by giving the matching control signal from said control unit to said impedance adjustment unit and controlling that impedance.
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Abstract
The present invention uses as a detector for adjustment measurement, monodyne interference between a microwave for plasma generation and the reflected wave. Analysis of the interference wave that is obtained using monodyne interference allows finding of the phase difference between the incident and the reflected wave and the amplitude of that reflected wave; and controlling of an excited microwave generation/control system based on them allows impedance matching between the excited microwave and the plasma. This method allows very high precision phase detection, and calculation of the characteristics of the plasma based on the detected phase shift. Therefore, it is possible to distinguish noises even in the vicinity of the matched region.
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4 Claims
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1. A plasma generator, which controls for impedance matching between a microwave and plasma that occurs due to the said microwave, comprising:
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a microwave generator;
an impedance adjustment unit, which changes the impedance for a microwave given from said microwave generator, a plasma generation unit, which receives the impedance adjusted microwave, generating plasma;
a monodyne interference unit, which obtains an interference wave due to the monodyne interference between the microwave given from said microwave generator and a microwave that has reflected by said plasma; and
a control unit, which processes a signal from the monodyne interference unit and provides a matching control signal;
wherein impedance matching between the microwave and plasma is taken by giving the matching control signal from said control unit to said impedance adjustment unit and controlling that impedance. - View Dependent Claims (2, 3, 4)
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Specification