发明名称 |
Inductively coupled plasma torch with adjustable sample injector |
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. |
申请公布号 |
US4766287(A) |
申请公布日期 |
1988.08.23 |
申请号 |
US19870022910 |
申请日期 |
1987.03.06 |
申请人 |
THE PERKIN-ELMER CORPORATION |
发明人 |
MORRISROE, PETER J.;ZANDER, ANDREW T.;MANNING, DAVID C.;GAGNE, PETER H. |
分类号 |
B23K9/26;B23K10/00;H05H1/30;(IPC1-7):B23K9/00 |
主分类号 |
B23K9/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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