基于低热容色谱技术便携式气相色谱仪的研制

Development of portable gas chromatograph based on low thermal mass chromatography

本研究基于低热容色谱技术研制了便携式气相色谱仪(GC),仪器主要由汽化室、毛细柱及加热控温系统、氢火焰检测器(FID)、电路系统和软件控制系统组成。研制的便携式气相色谱仪采用了多项小型化技术,开发了结构简单、易于实现均匀固体加热的汽化室;采用低热容色谱技术实现毛细柱固体加热,优化了PID控制算法,实现了精确控温;设计了结构简单、体积小的FID检测器;开发了功耗低、体积小、电池供电的电学控制系统;基于LabVIEW开发了包括温度控制、压力控制和数据处理模块的软件控制系统。开发的便携式气相色谱仪具有结构简单、体积小、控温精确、灵敏度高等优点。对仪器性能进行初步测试,仪器检测限优于5×10^(-10)g/s。

This instrument is mainly composed of a vaporizer, a capillary column, a temperature control system, a flame ionization detector （FID）, a electrical system and a software control system with miniaturization technologies. The developed portable gas chromatograph has the advantages of simple structure, small size, accurate temperature control and high sensitivity. The performance of the instrument was tested by toluene, and the detection limit was 5×10-10g/s.