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1. 发明授权

US6112576A Gas analyzer with background gas compensation 有权
标题翻译：气体分析仪，背景气体补偿
公开(公告)号：US6112576A
公开(公告)日：2000-09-05
申请号：US387988
申请日：1999-09-01
申请人： S. Gregory Tsopelas , Yufeng Huang , Robert H Hammond
发明人： S. Gregory Tsopelas , Yufeng Huang , Robert H Hammond
IPC分类号： G01N27/74
CPC分类号： G01N27/74
摘要： A sensor responds to a magnetic wind produced by the magnetic susceptibility of a target component gas, such as oxygen, which is present together with a background gas in a sample located in a measurement field produced in a measurement device. A background sampler also determines thermal and physical characteristics in a conditioned flow path, and a processor performs a computational correction on the detected magnetic wind signal to more accurately determine the concentration of the target gas. The background sampler includes a mass flow cell in series with a laminar flow device to measure heat capacity and viscous properties of the sample. It derives the gas viscosity from a differential pressure measurement; and preferably determines the heat capacity and thermal conductivity of background gases, the composition of which may be unknown, to compensate for their effects on the magnetic wind sensor elements. A further correction for diamagnetism of the background is made using one or more correlations between the measured parameters in certain common gases or classes of gases. The determination of gas bulk properties allows the concentration of the target gas to be made with enhanced accuracy in the presence of unknown, unquantified or changing background components, and the necessary hardware may be used in conjunction with existing magnetic wind sensor and processor. In that case, the processor program is modified to apply the additional sensor inputs to correct the magnetic wind reading. A thermal conductivity correction is also made, and this may be directly derived from the bridge control signal when operating the magnetic wind sensors in mode to maintain constant temperature. The system may be used in petroleum tanks and hydrocarbon vent systems to monitor for explosive levels of oxygen.
摘要翻译：传感器响应于由位于测量装置中产生的测量场中的样品中与背景气体一起存在的目标成分气体（例如氧）的磁化率产生的磁风。背景采样器还确定调节流路中的热和物理特性，并且处理器对检测到的磁风信号执行计算校正，以更精确地确定目标气体的浓度。背景采样器包括与层流装置串联的质量流通池，以测量样品的热容量和粘性。它从差压测量中得到气体粘度; 并且优选地确定背景气体的热容量和热导率，其组成可能是未知的，以补偿它们对磁风传感器元件的影响。使用某些普通气体或类别的气体中的测量参数之间的一个或多个相关性来进行背景的反磁性的进一步校正。气体体积特性的确定允许在未知的，未量化的或改变的背景组分的存在下以更高的精度制造目标气体的浓度，并且必要的硬件可以与现有的磁风传感器和处理器结合使用。在这种情况下，修改处理器程序以应用附加的传感器输入来校正磁风读数。还进行热导率校正，这可以直接从模式中的磁风传感器以桥梁控制信号得出，以保持恒定的温度。该系统可用于石油储罐和碳氢化合物排放系统，以监测爆炸性的氧气。

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