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    • 3. 发明授权
    • Plasma density monitor and method
    • 等离子体密度监测仪和方法
    • US5760573A
    • 1998-06-02
    • US485203
    • 1995-06-07
    • Ajit Pramod ParanjpeSteve Show-Wu Huang
    • Ajit Pramod ParanjpeSteve Show-Wu Huang
    • G01N27/64G01N27/66G01R19/00G10N27/00G01R33/00
    • G01N27/64G01N27/66G01R19/0061
    • A plasma density monitor is described for determining the ion current of a plasma flowing through a conduit (14). The monitor comprises a plate (18) having a face and an orifice extending from the face through the plate. The internal surface of the orifice conforms with the internal surface of the conduit when the face is adjacent the conduit. The monitor also comprises a detector circuit (22) for sensing the ion current collected by the internal surface of the plate (18). Another embodiment monitors plasma density by determining electrical conductivity in the afterglow of a microwave induced plasma. A resonant LC circuit (50, C3) has a multi-turn coil (C3) surrounding the conduit, an RF oscillator circuit (54, 56) for driving the LC circuit, and a circuit (64, 66, 68, 70, 72, 76) for measuring the decay time of the LC circuit. Plasma flowing through the conduit alters the resistivity of the coil and the time constant of the LC circuit proportional to the electrical conductivity of the flowing plasma.
    • 描述了等离子体密度监测器,用于确定流过导管(14)的等离子体的离子电流。 显示器包括具有面的板(18)和从表面延伸穿过板的孔。 当面与导管相邻时,孔的内表面与导管的内表面一致。 监视器还包括用于感测由板(18)的内表面收集的离子电流的检测器电路(22)。 另一个实施例通过确定微波感应等离子体的余辉中的电导率来监测等离子体密度。 谐振LC电路(50,C3)具有围绕导管的多匝线圈(C3),用于驱动LC电路的RF振荡器电路(54,56)和电路(64,66,68,70,72 ,76)用于测量LC电路的衰减时间。 流过导管的等离子体会改变线圈的电阻率和LC电路的时间常数与流动等离子体的电导率成比例。