System and method of measuring convection induced impedance gradients to determine liquid flow rates

摘要

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.