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1. 发明授权

US4775795A Method and apparatus for detecting very small concentrations of gases in a gas mixture 失效
标题翻译：用于检测气体混合物中非常小浓度的气体的方法和装置
公开(公告)号：US4775795A
公开(公告)日：1988-10-04
申请号：US13983
申请日：1987-02-12
申请人： Karl-Ernst Biehl , Egon Tyssen , Conrad G. von Roedern
发明人： Karl-Ernst Biehl , Egon Tyssen , Conrad G. von Roedern
IPC分类号： G01N27/64 , G01N27/66 , G01P5/18 , G01T1/10
CPC分类号： G01N27/622
摘要： A method for detecting very small concentrations of gases in gas mixtures passed as a gas stream through a measuring cell having a chamber through which the gas stream flows through, a drift zone provided between an inlet and an outlet of the chamber, a gas stream ionizing radiation source located at the inlet of the drift zone, a collector electrode located at the outlet of the drift zone, a grid consisting of two groups of parallel wires located in the drift zone current adjacent grid wires are supplied with different electrical voltages and whereat an AC voltage of adjustable frequency is fed to the two groups of grid wires, and a measuring apparatus for detecting the collector current, including the steps of inducing the movement of the ions through the drift zone by means of a ventilator which generates a controlled gas flow to the collector electrode, periodically changing the frequency of the AC voltage applied to the groups of grid wires either continuously or stepwise, simultaneously measuring the collector current dependent on the grid frequency, digitizing and storing the measured collector current in a memory as a function of the frequency, storing in a further memory a table of collector current/frequency curves for different gases, comparing the measured curves with the stored curves and, if a measured curve is identical with one of the stored curves, producing an indication signal characterizing the gas corresponding to the particular stored curve. An apparatus for measuring a gas concentration is provided using this method.
摘要翻译：一种用于检测气体混合物中气体混合物中非常小浓度的气体的方法，该气体混合物通过具有气体流过的室的测量池通过，设置在室的入口和出口之间的漂移区，气流离子化辐射源位于漂移区的入口处，位于漂移区出口处的集电极，由两组平行的电线组成的电网，位于漂移区中，电流相邻的电网电线被提供有不同的电压，其中可调频率的交流电压被馈送到两组栅格线，以及用于检测集电极电流的测量装置，包括通过产生受控气流的呼吸机使离子通过漂移区移动的步骤到集电极电极，连续或逐步地周期性地改变施加到栅格线组的AC电压的频率根据电网频率测量集电极电流，将测量的集电极电流数字化并存储在存储器中作为频率的函数，在另一存储器中存储不同气体的集电极电流/频率曲线表，将测量的曲线与存储的曲线，如果测量曲线与所存储的曲线之一相同，则产生表征与特定存储曲线对应的气体的指示信号。使用该方法提供测量气体浓度的装置。

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