发明授权
- 专利标题: Selective detection with high speed gas chromatography
- 专利标题(中): 高速气相色谱法选择性检测
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申请号: US73917申请日: 1993-06-09
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公开(公告)号: US5310681A公开(公告)日: 1994-05-10
- 发明人: David P. Rounbehler , Eugenie Hainsworth , David P. Lieb
- 申请人: David P. Rounbehler , Eugenie Hainsworth , David P. Lieb
- 申请人地址: MA Woburn
- 专利权人: Thermedics Inc.
- 当前专利权人: Thermedics Inc.
- 当前专利权人地址: MA Woburn
- 主分类号: G01N1/00
- IPC分类号: G01N1/00 ; G01N1/02 ; G01N1/22 ; G01N1/28 ; G01N1/40 ; G01N21/76 ; G01N27/417 ; G01N30/02 ; G01N30/06 ; G01N30/08 ; G01N30/12 ; G01N30/14 ; G01N30/16 ; G01N30/30 ; G01N30/40 ; G01N30/46 ; G01N30/62 ; G01N30/64 ; G01N30/72 ; G01N30/84 ; G01N31/12 ; G01N33/00 ; G01N33/22 ; G01V9/00 ; G01N25/54
摘要:
A highly selective, sensitive, fast detection system and method are disclosed for detecting vapors of specific compounds in air. Vapors emanating from compounds such as explosives, or stripped from surfaces using heat and suction from a hand-held sample gun, are collected on surfaces coated with gas chromatograph (GC) material which trap explosives vapors but repel nitric oxide, then are desorbed and concentrated in one or more cold spot concentrators. A high speed gas chromatograph (GC) separates the vapors, after which specific vapors are decomposed in two pyrolyzers arranged in parallel and the resulting nitric oxide is detected. A low temperature pyrolyzer with silver produces NO from nitramines or nitrite esters; a high temperature pyrolyzer decomposes all explosives vapors to permit detection of the remaining explosives. Also disclosed is a series arrangement of pyrolyzers and gas chromatographs and an NO detector to time-shift detection of certain vapors and facilitate very fast GC analyses. The use of hydrogen as a carrier gas, plus unique collectors and concentrators, high speed heaters, NO detectors, and very fast, temperature-programmable GC's enhance selectivity, sensitivity and speed of detection.
公开/授权文献
- US6067958A Throttle apparatus for an engine 公开/授权日:2000-05-30
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