Vapor collector/desorber with metallic ribbon,申请号US19870081918-传众专利搜索

Vapor collector/desorber with metallic ribbon

申请公布号：US5092157(A)

申请号：US19870081918

申请日期：1987.07.08

申请公布日期：1992.03.03

申请人：

THERMEDICS INC.

发明人：ACHTER, EUGENE K.;CARROLL, ALF L.;ROUNBEHLER, DAVID P.;FINE, DAVID H.;FRAIM, FREEMAN W.

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

主分类号：G01N1/00

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 chromatrograph (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.