Hand-held sample gun for vapor collection
US5123274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1987 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Jul 8, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/8405
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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 surface 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 pyroloyzers 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, sensit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.