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US Patent 5515295 - Methods and systems for fluid identification and flow rate determination
US Patent Issued on May 7, 1996
Estimated Patent Expiration Date:
December 22, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
December 22, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractMethods and systems for determining the identity and flow rate of a fluid are provided. Linearized output signals are provided. To determine fluid flow, a test fluid is passed through a conduit. A heater associated with the conduit is maintained a temperature greater than the temperature of the conduit in the presence of the test fluid. A measuring voltage is generated, wherein the measuring voltage is indicative of the voltage required to maintain the heater at the specified temperature. A data set is provided to a computer, which compares the measuring voltage with a reference voltage and determines the identity of the test fluid. Further, a flow function is applied to the data set and the fluid flow rate is calculated.Other References
| InventorApplicationNo. 361915 filed on 12/22/1994US Classes:702/45, Flow metering73/204.11, Thermal type73/204.16, By control of a separate heating or cooling element73/204.26, With substrate carrier (e.g., thin film)73/861.01, With indirect temperature or density compensation702/113Of mechanical systemField of Search73/861, VOLUME OR RATE OF FLOW73/861.01, With indirect temperature or density compensation73/204.11, Thermal type73/204.14, Including digital or pulse measuring circuitry73/204.16, By control of a separate heating or cooling element73/204.27, Wire type (e.g., hot wire)73/204.22, With sensor housing73/204.26With substrate carrier (e.g., thin film)ExaminersPrimary: Voeltz, Emanuel T.Assistant: Choi, Kyle J. Attorney, Agent or FirmUS Patent References4070908, Anemometer compensator linearizerIssued on: 01/31/1978 Inventor: Newell4122722, Anemometer compensator linearizer Issued on: 10/31/1978 Inventor: Newell4375667, Personal air sampling system Issued on: 03/01/1983 Inventor: Buchan4475388, Thermal flowmeter with temperature compensation Issued on: 10/09/1984 Inventor: Kawai , et al.4485449, Method and apparatus for the direct measurement of thermal energy transferred by a fluid medium Issued on: 11/27/1984 Inventor: Knauss4581714, Method of calibrating and linearizing the output of fluid measuring instruments Issued on: 04/08/1986 Inventor: Reid4581946, Instrumental error compensation circuit for flow meter Issued on: 04/15/1986 Inventor: Kanayama4638443, Gas detecting apparatus Issued on: 01/20/1987 Inventor: Kaneyasu , et al.4812747, Transducer linearizing system Issued on: 03/14/1989 Inventor: Gale , et al.4847783, Gas sensing instrument Issued on: 07/11/1989 Inventor: Grace , et al.4884215, Airflow sensor and control circuit Issued on: 11/28/1989 Inventor: Zboralski, et al.4944035, Measurement of thermal conductivity and specific heat Issued on: 07/24/1990 Inventor: Aagardl, et al.5177696Method of determination of gas properties at reference conditions Issued on: 01/05/1993 Inventor: Bonne Foreign Patent References
International ClassG01F 001/688 |
