Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-01-19
1998-12-01
Biegel, Ronald L.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386116, 7386117, 7386113, G01F 160
Patent
active
058441433
ABSTRACT:
An electromagnetic flowmeter for measuring a flow rate of a fluid which flows through a measuring pipeline arranged in a controlled magnetic field. The electromagnetic flowmeter includes an electromagnet unit excited by an exciting current, for generating a magnetic flux in the controlled magnetic field, a magnetic sensor unit for measuring a density of the magnetic flux generated in the controlled magnetic field, and a signal generating unit for generating an electric signal according to the density of the magnetic flux generated in the controlled magnetic field and a flow speed of the fluid, an adjusting unit, coupled to the magnetic sensor unit, for adjusting the magnetic flux density to a predetermined value by controlling the exciting current. The flowmeter also includes a measuring unit for measuring the electric signal at a predetermined time cycle determined by a frequency of the exciting current, thus causing the electric signal to be measured every time the magnetic flux density is at the predetermined value. A computation unit computes the flow rate of the fluid based on the measured electric signal and an exciting current at a time when the measured electric signal is detected.
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Biegel Ronald L.
Kabushiki Kaisha Toshiba
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