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2. 发明申请

WO2017001824A2 IMPROVEMENTS IN OR RELATING TO GAS FLOW MEASUREMENT 审中-公开
标题翻译：与气体流量测量相关的改进
公开(公告)号：WO2017001824A2
公开(公告)日：2017-01-05
申请号：PCT/GB2016/051859
申请日：2016-06-21
申请人： ISIS INNOVATION LIMITED
发明人： ROBBINS, Peter Alistair , O'NEILL, David , COUPER, John , HANCOCK, Gus , RITCHIE, Grant , CIAFFONI, Luca
IPC分类号： G01F1/36 , A61M16/00 , G01N33/00 , G01N21/00 , A61B5/083
CPC分类号： G01F1/36 , A61B5/0833 , A61B5/0836 , A61B5/087 , A61M2016/0036 , A61M2016/1025 , A61M2230/432 , G01N21/031 , G01N21/3504 , G01N21/39
摘要： A molecular flow sensor comprises a flowmeter integrated with an in airway laser gas analyser. The laser gas analyser spectroscopically analyses the concentrations of gases such as oxygen, carbon dioxide and water in a measurement space which is in the gas flow path between two Lilly-type flow-sensing mesh screens. The gas flow through the measurement space is measured by measuring the pressure drop across the flow-sensing mesh screens using a differential pressure sensor. Helical baffles are provided upstream and downstream of the measurement space to provide a low resistance gas flow path while blocking ambient light from entering the measurement space, and flow-conditioning elements of mesh or metal foam are provided between the helical baffles and the flow- sensing meshes. Pressure averaging is conducted circumferentially around the gas flow path by the use of circumferentially spaced gas sensing holes connected to a pressure averaging channel which communicates with the differential pressure sensor. The differential pressure sensor is composed of an array of individual pressure sensors to improve baseline stability and linearity. At least two independent pressure sensors may be provided, switchable out independently to allow regular calibration while the other is still measuring. The flow sensor is particularly useful for measuring respiratory gas exchange such as oxygen consumption or carbon dioxide production by a respiring subject.
摘要翻译：分子流量传感器包括与气道内激光气体分析仪集成的流量计。激光气体分析仪通过光谱分析在两个礼来型流量感应筛网之间的气体流动路径中的测量空间中的气体浓度，例如氧气，二氧化碳和水。通过测量空间的气体流量通过使用压差传感器测量流量感测网筛两端的压降来测量。螺旋挡板设置在测量空间的上游和下游，以提供低电阻气体流动路径，同时阻止环境光进入测量空间，并且网状或金属泡沫的流动调节元件设置在螺旋折流板和流量感测器之间网格。通过使用与压差平均通道连接的周向间隔的气体传感孔，在气体流动路径周围进行压力平均。压力平均通道与差压传感器连通。差压传感器由一系列单独的压力传感器组成，以提高基线稳定性和线性度。至少可以提供两个独立的压力传感器，可独立切换以允许常规校准，而另一个仍在测量。流量传感器特别适用于测量呼吸气体交换，例如呼吸主体的氧气消耗或二氧化碳产生。

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