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    • 4. 发明授权
    • Method of and apparatus for measuring the molecular weight of a gas
    • 用于测量气体分子量的方法和装置
    • US09459191B2
    • 2016-10-04
    • US13989232
    • 2011-11-28
    • Neil Alexander Downie
    • Neil Alexander Downie
    • G01N29/02G01N9/00G01N29/036
    • G01N9/002G01N29/036G01N2291/021G01N2291/02818
    • There is provided a meter for measuring the molecular weight of a gas, the meter comprising a housing having an inlet and an interior for receiving said gas to be measured, a sensor assembly comprising a high-frequency planar piezoelectric crystal oscillator located within said housing so that, in use, the piezoelectric crystal oscillator is in contact with said gas, said sensor assembly being arranged: to drive the piezoelectric crystal oscillator such that the piezoelectric crystal oscillator resonates at a single resonant frequency; to measure said single resonant frequency of said piezoelectric crystal oscillator to determine the density of gas; and to determine from the density, determined or pre-determined pressure of the gas and determined or pre-determined temperature of the gas, the molecular weight of the gas.
    • 提供了一种用于测量气体的分子量提供了一种测量仪,包括:具有用于接收所述气体的入口和内部的壳体的计进行测量时,所述壳体中的传感器组件,其包括位于内一个平面型高频压电晶体振荡器,从而 即,在使用中,压电晶体振荡器是与所述的气体,所述布置的传感器组件,包括:驱动压电晶体振荡器,使得压电晶体振荡器谐振在一个单一的谐振频率; 测量所述压电晶体振荡器的所述单个谐振频率以确定气体的密度; 并从密度确定,确定或气体的预先确定的压力并确定或预先确定的气体中,气体的分子量的温度。
    • 5. 发明授权
    • Monitoring medical gas xenon concentration using ultrasonic gas analyser
    • 使用超声波气体分析仪监测医用气体氙浓度
    • US07434580B2
    • 2008-10-14
    • US10512797
    • 2003-05-01
    • Neil Alexander DownieStuart Alexander Kerr
    • Neil Alexander DownieStuart Alexander Kerr
    • A62B7/10A62B23/02A62B7/00A61M16/00
    • G01N29/222G01N29/024G01N2291/0212G01N2291/0215G01N2291/02809G01N2291/101
    • The concentration of xenon, in a medical gas mixture of xenon as an active component with a known composition of oxygen and, optionally, nitrogen and/or helium recirculating through a medical device (103) in which carbon dioxide is introduced into the mixture, is monitored by removal (135, 133) of carbon dioxide downstream of the medical device (103) and subsequently passing the carbon dioxide-free gas through an ultrasonic gas analyser (143) upstream of the medical device. The gas analyzer determines the xenon concentration by measuring the time delay between transmission of an ultrahigh frequency ultrasonic pulse of at least 100 kHz axially through the sample chamber from a location at one end thereof and reflection of said pulse axially from the other end of the sample chamber back to said location. An analyser of novel construction is disclosed.
    • 氙作为具有已知组成的氧的活性成分的医用气体混合物的浓度,以及任选地通过将二氧化碳引入混合物的医疗装置(103)再循环的氮和/或氦的混合物为 通过在医疗装置(103)的下游去除(135,133)二氧化碳并随后使无二氧化碳气体通过医疗装置上游的超声波气体分析器(143)来监测。 气体分析仪通过测量从其一端的位置轴向通过样品室的至少100kHz的超高频超声脉冲的透射之间的时间延迟以及从样品的另一端轴向反射所述脉冲的时间延迟来确定氙浓度 房间回到所述位置。 公开了一种新颖的结构分析仪。
    • 10. 发明授权
    • Volume flow controller
    • 体积流量控制器
    • US07669594B2
    • 2010-03-02
    • US10534781
    • 2003-11-20
    • Neil Alexander Downie
    • Neil Alexander Downie
    • A61M15/00
    • G05D7/0635
    • A volume flow controller (1) for controlling the flow of a gas mixture of variable proportions through a conduit (3) has a valve means (5) for regulating the flow of gas through the conduit, a drive means (9) for driving the valve means, a volumetric flow meter (7), such as a Pelton wheel, for measuring the flow of gas through the conduit, which provides a feedback signal (29) for comparison with a setpoint signal (17) in an amplifier (15) which generates an adjustment signal (11) which is fed to the drive means. The setpoint signal is generated by a setpoint signal generating means (19), which comprises a potentiometer (21) for inputting a value corresponding to a desired flow rate and a slowdown circuit (23) consisting of a resistor (25) and a capacitor (27) for delaying the change in the setpoint from the previous setpoint to the desired setpoint for a period of time sufficient to compensate for the delay in response inherent in the volumetric flow meter, thus providing smooth and stable control of the gas flow. Preferably, the potentiometer is a digital potentiometer (403), which voltage is variable by independent manipulation of rotary encoders (417).
    • 用于通过导管(3)控制可变比例的气体混合物的流动的体积流量控制器(1)具有用于调节通过导管的气体流动的阀装置(5),用于驱动 阀装置,诸如佩尔顿轮的体积流量计(7),用于测量通过管道的气体流量,其提供用于与放大器(15)中的设定点信号(17)进行比较的反馈信号(29) 其产生馈送到驱动装置的调节信号(11)。 设定点信号由设定点信号发生装置(19)产生,该装置包括用于输入对应于期望流量的值的电位器(21)和由电阻器(25)和电容器(25)组成的减速电路(23) 27),用于将设定值从先前设定点延迟到期望设定值足以补偿体积流量计中固有的响应延迟的时间段,从而提供对气流的平稳和稳定的控制。 优选地,电位器是数字电位器(403),该电压通过旋转编码器的独立操作而变化(417)。