SYSTEM AND METHOD FOR TRACE SAMPLE PRECOLLECTION AND PRECONCENTRATION

摘要

A device and procedure are described that can be used for improved sampling of traces such as for explosive trace screening, by precollection and preconcentration of trace samples of vapor and particulate matter from air. The device is unique in its ability to collect both solid and vapor traces.

主权项

1. A device for precollection and preconcentration of solids and vapors in a fluid stream comprising:
a chamber 100 into which said fluid stream is entrained; a constricting bottleneck 103 in the path of said fluid stream tending to increase the velocity thereof; a barrier plate 105 at the exit from said bottleneck adapted to force said fluid stream to rapidly change direction 104; vapor collection means disposed upon said barrier plate;wherein both solids and vapors are collected from said fluid stream.