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    • 5. 发明申请
    • System and method of measuring convection induced impedance gradients to determine liquid flow rates
    • 测量对流感应阻抗梯度以确定液体流速的系统和方法
    • US20040118201A1
    • 2004-06-24
    • US10328986
    • 2002-12-23
    • Waters Investments Limited
    • Geoff C. GerhardtKeith Fadgen
    • G01F001/68
    • G01F1/6847G01N30/64G01N2030/324
    • A method and system for measuring the flow rate of a liquid or gas within a flow channel utilizing a centrally located excitation source and a plurality of sensor means. Said excitation means is comprised of a heating element coupled with an alternating current generator. Of the plurality of sensor means, at least one of said sensors is located in a position upstream of the excitation source location, and additionally a second of said plurality of sensors is located in a position downstream of the excitation source. Instantaneous fluid flow rate is calculated utilizing a high gain differential amplifier electrically coupled to said sensors, wherein the convectively induced inductive gradient of the flowing fluid is compared to the symmetrical zero flow induction gradient. Following such a comparison, a voltage signal proportional to the flow of fluid within the channel is derived.
    • 一种用于利用位于中心的激励源和多个传感器装置来测量流动通道内的液体或气体的流量的方法和系统。 所述激励装置包括与交流发电机耦合的加热元件。 在多个传感器装置中,至少一个所述传感器位于激励源位置的上游位置,并且所述多个传感器中的另一个位于激发源的下游位置。 利用电耦合到所述传感器的高增益差分放大器来计算瞬时流体流速,其中流动流体的对流感应感应梯度与对称零流感应梯度进行比较。 在进行这样的比较之后,导出与通道内的流体流量成比例的电压信号。
    • 9. 发明申请
    • High pressure capillary liquid chromatography solvent delivery stystem
    • 高压毛细管液相色谱溶剂输送系统
    • US20020017484A1
    • 2002-02-14
    • US09952934
    • 2001-09-14
    • Waters Investments Limited
    • Theodore A. Dourdeville
    • B01D015/08
    • G01N30/24B01D15/166G01N30/36G01N2030/326
    • High pressure capillary liquid chromatography solvent delivery is effected at substantially low volume and atmospheric pressure. The low volume solvent composition is subsequently pressurized and expelled at high pressure into a receiving device such as a column. The solvent composition is expelled from a fluid metering system configured to deliver liquids at low pressures to a storage matrix via an isolation valve. The solvent composition is delivered to the storage matrix in reverse order such that the first volume of liquid delivered into the storage matrix is the last volume of liquid expelled out. Liquid pre-existing within the storage matrix is transferred into a fluid accumulator in fluid communication with the storage matrix. The fluid accumulator is enveloped in a pressure caisson which can be pressurized or depressurized in response to sensor signals obtained from a fluid volume displacement transducer and a pressure sensor, in accordance with solvent composition cycle formation. As the caisson is pressurized, the pressure acting on the fluid accumulator causes the solvent composition within the storage matrix to be expelled out past the isolation valve into a chromatographic column.
    • 高压毛细管液相色谱溶剂输送在基本上低体积和大气压下进行。 随后将低体积溶剂组合物加压并在高压下排出到诸如柱的接收装置中。 溶剂组合物从被配置成经由隔离阀将低压液体输送到储存基质的流体计量系统排出。 溶剂组合物以相反的顺序输送到储存基质,使得输送到储存基质中的第一体积的液体是排出的最后一液体体积。 在存储矩阵内预先存在的液体被转移到与存储矩阵流体连通的流体蓄积器中。 流体蓄能器被包围在压力沉箱中,其可以响应于根据溶剂组成循环形成从流体容积位移传感器和压力传感器获得的传感器信号而被加压或减压。 当沉箱被加压时,作用在流体蓄液器上的压力导致储存基质中的溶剂组合物被排出通过隔离阀进入色谱柱。