发明名称 |
APPARATUS AND METHOD FOR TRACE VAPOUR DETECTION |
摘要 |
An apparatus is provided for detecting trace quantities of chemical species in the form of a vapor by subjecting ions produced in a sample of the mixed gas under flow to an ion repulsive electric field which is directed in the opposite direction to the flow of the gases, and comprises a fan for drawing the sample through a hollow body, having an inlet, a first region containing means for ionizing at least a proportion of the molecules of the sample by a corona discharge, a second region in which the sample is subjected to an oppositely directed ion repulsive electric field and a third region having an electrode for collecting ions of selected polarity. Ions of a selected polarity whose ionic mobilities exceed a value dependent on the strength of the ion repulsive electric field and the velocity of the gas flow are prevented from entering the third region. A resistor may be provided to limit the current of the corona electric discharge to a value not greater than 100 nanoamps. |
申请公布号 |
DE2963359(D1) |
申请公布日期 |
1982.09.09 |
申请号 |
DE19792963359 |
申请日期 |
1979.03.14 |
申请人 |
PYE (ELECTRONIC PRODUCTS) LIMITED |
发明人 |
KRAICER, ALEC C/O PHILIPS ELECTRONIC AND ASS.;BRADSHAW, ROBERT FAGAN DONAT C/OPHILIPS ELECTRONIC |
分类号 |
G01N27/64;G01N27/68;(IPC1-7):G01N27/62;H01T20/00 |
主分类号 |
G01N27/64 |
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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