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预浓缩器是用于预先浓缩待测微粒或蒸气的仪器和方法,可用于痕量化学物质探测仪器,如离子迁移谱仪(IMS)、质谱仪(MS)等。含有极低浓度待测化合物的空气流通过一个渗透屏,待测物质微粒积聚在渗透屏上,渗透屏相当于一种选择性粒子过滤器。关闭空气气流,打开横向流动的载气气流,载气平行流经渗透屏表面,解吸积聚在屏上的微粒,并将微粒或蒸气送入离子迁移谱等探测器内。渗透屏可通电加热以促进微粒的解吸。本文介绍了可用于爆炸物、毒品和化学试剂探测系统的预浓缩器仪器和设计。
Preconcentrator is a device and method for preconcentration of particles or vapors to be detected, which can be used for trace chemical detection instruments such as IMS, MS and the like. The air stream containing the test compound at a very low concentration is passed through a permeable screen where the test substance particles accumulate on the permeate screen which acts as a selective particle filter. Close the air flow, open the transverse flow of carrier gas flow, the carrier gas flows parallel to the surface of the permeable screen, desorption of particles accumulated on the screen, and particles or vapor into the ion mobility spectrometer and other detectors. The permeable screen can be electrically heated to promote the desorption of the particles. This article presents preconcentrator instruments and designs that can be used in explosive, drug and chemical reagent detection systems.