Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2005-11-08
2005-11-08
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
06962077
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 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.
REFERENCES:
patent: 3801902 (1974-04-01), Horowitz
patent: 5936156 (1999-08-01), Roberts et al.
patent: 6085588 (2000-07-01), Khadkikar et al.
patent: 6474155 (2002-11-01), Berkcan et al.
Fadgen Keith
Gerhardt Geoff C.
Hanley Elizabeth A.
Lahive & Cockfield LLP
Lefkowitz Edward
Mack Corey D.
Waters Investments Limited
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