一、前言气体色谱发展极为迅速,早期的气体色谱鉴定器已在很多方面不能适应它的要求。为了尽力减小进样量以求提高分离效能,以及鉴定微量组分或杂质,都需要灵敏度非常高的鉴定器。特别是目前国外已普遍采用的具有高分离效能和高分析速度的毛细管色谱柱,不但要求鉴定器灵敏度高,而且要体积小(几微升),响应快(时间常数小于0.25秒)。一般气体色谱仪所采用的热传导式鉴定器在这几方面都不合要求。气体密 I. INTRODUCTION The development of gas chromatography is extremely rapid. Early gas chromatography detectors have failed to meet its requirements in many ways. In order to minimize the injection volume in order to improve the separation efficiency, as well as the identification of trace components or impurities, require very sensitive identifier. In particular, capillary columns with high separation efficiency and high analytical speed, which are widely used in foreign countries, require not only high sensitivity, but also small volume (a few microliters) and fast response (time constant less than 0.25 second). General-purpose gas chromatography used in the thermal conductivity of the identification in these areas are not satisfactory. Gas tight