Note: practical monitoring system using characteristic impedance measurement during plasma processing.

Area of Science:

• Plasma Physics
• Electrical Engineering
• Process Monitoring

Background:

• Plasma processing is crucial in manufacturing, but real-time anomaly detection remains challenging.
• Conventional monitoring methods using voltage and current probes can be complex and introduce delays.

Purpose of the Study:

• To develop a novel method for real-time anomaly detection in plasma processing.
• To introduce a high-sensitivity and structurally simple monitoring system for mass production equipment.

Main Methods:

• Characteristic Impedance Monitoring (CIM) system utilizing a directional coupler.
• A newly developed vector processing system for real-time impedance measurement.
• Elimination of conventional high voltage and current probes to avoid time delay.

Main Results:

• The CIM system achieves high-sensitivity and real-time monitoring of plasma processes.
• The system successfully measures time variations of characteristic and load impedances during plasma generation.
• Structural simplicity allows for easy integration into mass production equipment.

Conclusions:

• The developed CIM method offers a significant advancement in plasma processing anomaly detection.
• Real-time impedance monitoring provides crucial insights for process control and quality assurance.
• The system's simplicity and effectiveness make it suitable for industrial applications.