公开(公告)号：US6155097A

公开(公告)日：2000-12-05

申请号：US87666

申请日：1998-05-29

Applicant: James T. Arnold

Inventor： James T. Arnold

IPC: G01N1/40 ,  G01N30/14 ,  G01N30/62 ,  G01N30/72 ,  G01N30/04 ,  G01N30/08

CPC classification number: G01N1/4005 ,  G01N30/14 ,  G01N2001/4016 ,  G01N2030/146 ,  G01N2030/623 ,  G01N30/7206

Abstract: A method and apparatus is provided for increasing sensitivity for near-real-time detection of very low concentrations of diffusely distributed trace vapors in a carrier medium. Before admitting the trace vapor bearing carrier medium into a near-real-time GC/MS trace vapor detection system, the concentration of the trace vapor in the carrier medium, air in this instance, is increased by passing it through a membrane gas separator. The gas separator preferentially passes a portion of the trace vapor and rejects all but a very small portion of the carrier medium. The sample, highly concentrated in trace vapor with respect to the carrier medium after passing through the gas separator, is then compressed by a turbomolecular pump resulting in a substantial increase in density of the trace vapor at the exhaust port of the pump and a corresponding increase in detection sensitivity.

Abstract translation: 提供了一种方法和装置，用于提高载体介质中极低浓度的弥散分布痕量蒸汽的近实时检测的灵敏度。 在将痕量蒸气承载载体介质接近实时GC / MS痕量蒸汽检测系统之前，载体介质中的痕量蒸汽浓度，在这种情况下为空气，通过使膜通过膜气分离器而增加。 气体分离器优先通过痕量蒸气的一部分，并且除去载体介质的非常小的部分之外的所有物质。 然后通过涡轮分子泵将样品高度浓缩在相对于载体介质的痕量蒸气中，然后通过涡轮分子泵进行压缩，导致在泵的排气口处的痕量蒸气的密度显着增加，并且相应增加 在检测灵敏度。