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1. 发明授权

US5576626A Compact and low fuel consumption flame ionization detector with flame tip on diffuser 失效
标题翻译：紧凑，低燃耗的火焰离子化检测器，带有扩散器的火焰头
公开(公告)号：US5576626A
公开(公告)日：1996-11-19
申请号：US375330
申请日：1995-01-17
申请人： Chi K. Lo
发明人： Chi K. Lo
IPC分类号： G01N27/62 , G01N30/02 , G01N30/68
CPC分类号： G01N30/68 , G01N2030/0095 , G01N2030/025
摘要： A compact and low fuel consumption flame ionization detector includes a precisely pored metallic disk or a silicon micro-machined diffuser plate through which the sample gas tube extends a minimum distance (less than 2 mm). The oxidant flows into the detector in a direction parallel to a plane of the diffuser plate, passes into a small cavity under the diffuser, and then passes through a large number of very small holes formed in the diffuser plate before encountering the sample gas flow at the end of the gas tube. A narrow diameter collector is closely spaced to the end of the gas tube. The direction of feeding the air and the diffuser plate (which acts as a baffle) provide laminar flow and eliminate the flicker noise which would otherwise occur due to the air flow inlet being located very close to the gas tube end. The FID is vertically compact and operates at a high electric field strength, exceeding 90 V/mm. The FID has a low fuel flow, typically 12-15 ml/min and therefore a low oxidant flow rate, typically 120-150 ml/min, advantageous to the operation of a portable gas chromatograph. The compactness of the FID also requires less electrical power to heat the detector to operating temperature, thus prolonging battery life.
摘要翻译：紧凑且低燃耗的火焰离子化检测器包括精确钻孔的金属盘或硅微加工的扩散板，样品气体管通过该扩散板延伸最小距离（小于2mm）。氧化剂在平行于扩散板的平面的方向上流入检测器，进入扩散器下面的小空腔中，然后在遇到样品气体流动之前通过形成在扩散板中的大量非常小的孔气管末端。窄直径收集器与气体管的端部紧密地间隔开。供给空气和扩散板（其作为挡板）的方向提供层流，并消除否则将由于空气流入口位于气体管端非常接近的情况而发生的闪烁噪声。 FID垂直紧凑，工作电压高，超过90 V / mm。 FID具有低燃料流量，通常为12-15ml / min，因此低的氧化剂流速，通常为120-150ml / min，有利于便携式气相色谱仪的操作。 FID的紧凑性也需要更少的电力来将检测器加热到工作温度，从而延长电池寿命。

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