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1. 发明授权

US5736739A Recirculating filtration system for use with a transportable ion mobility spectrometer in gas chromatography applications 失效
标题翻译：循环过滤系统，用于气相色谱应用中的可移动离子迁移谱仪
公开(公告)号：US5736739A
公开(公告)日：1998-04-07
申请号：US726843
申请日：1996-10-08
申请人： Robert E. Uber , Viktor Kouznetsov , Alexander Tarassov , Byron L. Carnahan , Charles W. Pipich
发明人： Robert E. Uber , Viktor Kouznetsov , Alexander Tarassov , Byron L. Carnahan , Charles W. Pipich
IPC分类号： G01N27/64 , H01J49/40 , H01J49/04
CPC分类号： G01N27/622 , G01N30/7206
摘要： Generally, the present invention provides a recirculating filtration system for use with a transportable ion mobility spectrometer in gas chromatography applications. The transportable recirculating filtration system comprises a pump and a set of filters and flow sensors connected to an ion mobility spectrometry sensor having a gas chromatograph column at its inlet. The IMS sensor's outlet flow is cleaned by the filters and recirculated by the pump back into the IMS sensor as the carrier fluid stream flow. A portion of the IMS sensor's outlet flow equal to the amount of flow introduced into the sensor as the sample is exhausted from the filtration system to maintain a constant total flow volume through the system as the sample is being analyzed. Preferably, the multicapillary column is sealed to a heated transfer line leading to the sample stream inlet of the IMS sensor. The transfer line is preferably maintained at a temperature 10.degree. C.-40.degree. C. above that of the multicapillary column in order to ensure that analyte species will not adsorb on the walls of the transfer line instead of entering the sample stream inlet of the IMS sensor. The transfer line can be optionally configured with a flow smoothing insert to produce a laminar flow profile throughout the volume between the transfer line outlet end and the IMS sensor housing upon exit of the carrier flow stream from the flow smoothing insert.
摘要翻译：通常，本发明提供了一种在气相色谱应用中与可运输离子迁移谱仪一起使用的再循环过滤系统。可运输的循环过滤系统包括泵和一组连接到其入口处具有气相色谱柱的离子迁移谱传感器的过滤器和流量传感器。 IMS传感器的出口流被过滤器清洁，并随着载体流体流的流动而被泵再循环回到IMS传感器中。随着样品从过滤系统排出，IMS传感器的出口流的一部分等于引入传感器的流量，以便在分析样品时保持通过系统的恒定总流量。优选地，多毛细管柱被密封到通向IMS传感器的样品流入口的加热的输送管线。传输线优选保持在高于多毛细管柱的温度10℃-40℃的温度下，以确保分析物种不会吸附在输送管线的壁上，而不是进入 IMS传感器。输送管线可以可选地配置有流动平滑插入件，以在从流动平滑插入件离开载体流动流时，在传送线出口端和IMS传感器外壳之间的整个体积中产生层流分布。

2. 发明授权

US5420424A Ion mobility spectrometer 失效
标题翻译：离子迁移谱仪
公开(公告)号：US5420424A
公开(公告)日：1995-05-30
申请号：US235484
申请日：1994-04-29
申请人： Byron L. Carnahan , Alexander S. Tarassov
发明人： Byron L. Carnahan , Alexander S. Tarassov
IPC分类号： G01N27/62 , G01N27/64 , G01N33/22 , H01J49/40 , H01J49/42
CPC分类号： G01N27/624 , G01N33/22
摘要： An ion mobility spectrometer having a housing with an analyzer positioned therein. The analyzer includes first and second longitudinally spaced apart electrodes which are preferably cylindrical in configuration. The space between the electrodes defines an analytical gap which is in communication with a source of carrier gas. An ionization source such as a .beta.-emitter or corona discharge is juxtaposed with the analytical gap and source of sample media and includes an ion aperture for ions to enter said gap. The spectrometer includes an ion detector for measuring ions. An electrical controller connected to the first and second electrodes for impressing a first direct potential and second periodic asymmetrical potential capable of creating a transverse electrical field therebetween during the flow of carrier gas in the analytical gap. Preferably, a third low voltage ripple potential is impressed in series with the first two potentials. A third electrode, normally the ionization source, for electrically migrating the ions formed by the source into the analytical gap is positioned proximate to the ion aperture.
摘要翻译：具有壳体的离子迁移谱仪，分析仪定位在其中。分析器包括第一和第二纵向间隔开的电极，其优选地是圆柱形的。电极之间的空间限定了与载气源连通的分析间隙。诸如β-发射体或电晕放电的电离源与样品介质的分析间隙和源并列，并且包括用于离子进入所述间隙的离子孔。光谱仪包括用于测量离子的离子检测器。连接到第一和第二电极的电控制器用于施加第一直接电位和第二周期性非对称电位，其能够在分析间隙内的载气流动期间产生横向电场。优选地，第三低电压纹波电势与前两个电位串联。用于将由源形成的离子电离迁移到分析间隙中的第三电极（通常为电离源）定位成靠近离子孔。

3. 发明授权

US4778998A Humidity compensation for a photoionization type detector 失效
标题翻译：光电离型检测器的湿度补偿
公开(公告)号：US4778998A
公开(公告)日：1988-10-18
申请号：US058813
申请日：1987-06-05
申请人： Byron L. Carnahan
发明人： Byron L. Carnahan
IPC分类号： G01N27/66 , G01T1/18
CPC分类号： G01N27/66
摘要： A photoionization type detector utilizes a photoionization sensor to detect the concentration of contaminants in the air, a humidity sensor to detect the water vapor concentration in the air and a temperature sensor to detect the temperature of the air. A microcomputer first calculates the water vapor concentration present in the air from the humidity and temperature sensor readings. Then, the microcomputer applies a predetermined correction factor corresponding to the calculated absolute humidity to the response of the photoionization sensor. This correction factor compensates for the negative cross-sensitivity of the photoionization sensor the humidity in the art and produces an accurate contaminant concentration level which is then displayed.
摘要翻译：光电离型检测器利用光电离传感器来检测空气中的污染物的浓度，用于检测空气中的水蒸气浓度的湿度传感器和用于检测空气温度的温度传感器。微机首先根据湿度和温度传感器读数计算出空气中存在的水蒸气浓度。然后，微计算机将与计算出的绝对湿度相对应的预定校正因子应用于光电离传感器的响应。该校正因子补偿光电离传感器在本领域中的湿度的负交叉敏感度，并产生准确的污染物浓度水平，然后显示。

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