-
公开(公告)号：EP0281158A3
公开(公告)日：1989-10-11
申请号：EP88103413.6
申请日：1988-03-04
CPC分类号： H05H1/30 , H05H1/2475
摘要： An induction plasma system comprises a torch (10) and an induction coil (14). A sample substance is injected into the plasma at an axial position that is adjustable while the plasma is being energized. The plasma-forming gas flows through the induction coil prior to passing through the plasma torch. A piezoelectric crystal (98) is used for initiating the plasma. An oscillator network generates radio frequency power at a first frequency, and an output LC network (206) that includes the induction coil is tuned to a second frequency higher than the first frequency. Means for maintaining constant power to the plasma includes an AC circuit for duty cycling AC power input to a DC power supply in response to a feedback signal relative to the rectified voltage. Thus a change in the rectified voltage effects an inverse change in the duty cycling such as to nullify the change in the rectified voltage.
-
公开(公告)号：EP0281158B1
公开(公告)日：1994-01-12
申请号：EP88103413.6
申请日：1988-03-04
CPC分类号： H05H1/30 , H05H1/2475
摘要： An induction plasma system comprises a torch (10) and an induction coil (14). A sample substance is injected into the plasma at an axial position that is adjustable while the plasma is being energized. The plasma-forming gas flows through the induction coil prior to passing through the plasma torch. A piezoelectric crystal (98) is used for initiating the plasma. An oscillator network generates radio frequency power at a first frequency, and an output LC network (206) that includes the induction coil is tuned to a second frequency higher than the first frequency. Means for maintaining constant power to the plasma includes an AC circuit for duty cycling AC power input to a DC power supply in response to a feedback signal relative to the rectified voltage. Thus a change in the rectified voltage effects an inverse change in the duty cycling such as to nullify the change in the rectified voltage.
-
公开(公告)号：EP0281158A2
公开(公告)日：1988-09-07
申请号：EP88103413.6
申请日：1988-03-04
CPC分类号： H05H1/30 , H05H1/2475
摘要： An induction plasma system comprises a torch (10) and an induction coil (14). A sample substance is injected into the plasma at an axial position that is adjustable while the plasma is being energized. The plasma-forming gas flows through the induction coil prior to passing through the plasma torch. A piezoelectric crystal (98) is used for initiating the plasma. An oscillator network generates radio frequency power at a first frequency, and an output LC network (206) that includes the induction coil is tuned to a second frequency higher than the first frequency. Means for maintaining constant power to the plasma includes an AC circuit for duty cycling AC power input to a DC power supply in response to a feedback signal relative to the rectified voltage. Thus a change in the rectified voltage effects an inverse change in the duty cycling such as to nullify the change in the rectified voltage.
摘要翻译： 感应等离子体系统包括炬（10）和感应线圈（14）。 将样品物质注入到等离子体通电期间可调节的轴向位置处的等离子体中。 等离子体形成气体在通过等离子体焰炬之前流过感应线圈。 压电晶体（98）用于引发等离子体。 振荡器网络以第一频率产生射频功率，并且包括感应线圈的输出LC网络（206）被调谐到高于第一频率的第二频率。 用于维持等离子体的恒定功率的装置包括响应于相对于整流电压的反馈信号而向DC电源输入的负载循环AC电力的AC电路。 因此，整流电压的变化会影响占空比的反向变化，从而消除整流电压的变化。
-
-
搜索结果
3 条记录 (耗时 0.012 秒)
