Invention Grant
- Patent Title: System and method of measuring convection induced impedance gradients to determine liquid flow rates
- Patent Title (中): 测量对流感应阻抗梯度以确定液体流速的系统和方法
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Application No.: US11088120Application Date: 2005-03-22
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Publication No.: US07059185B2Publication Date: 2006-06-13
- Inventor: Geoff C. Gerhardt , Keith Fadgen
- Applicant: Geoff C. Gerhardt , Keith Fadgen
- Applicant Address: US DE New Castle
- Assignee: Waters Investments Limited
- Current Assignee: Waters Investments Limited
- Current Assignee Address: US DE New Castle
- Agency: Lahive & Cockfield, LLP
- Agent Elizabeth A. Hanley, Esq.
- Main IPC: G01F1/68
- IPC: G01F1/68

Abstract:
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 sensors. The excitation source is comprised of a heating element coupled with an alternating current generator. Of the plurality of sensors, at least one of the sensors is located in a position upstream of the excitation source location, and additionally a second of the 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 the 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.
Public/Granted literature
- US20050160833A1 System and method of measuring convection induced impedance gradients to determine liquid flow rates Public/Granted day:2005-07-28
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