Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2005-06-10
2009-02-24
Raymond, Edward (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C702S100000, C702S050000, C073S861120, C073S700000, C073S001160
Reexamination Certificate
active
07496455
ABSTRACT:
An electromagnetic flowmeter includes a measuring tube (1) through which a fluid to be measured flows, electrodes (2a,2b) which are placed in this measuring tube and detect an electromotive force generated by a magnetic field applied to the fluid and the flow of the fluid, an exciting coil (3) and power supply unit (4) which apply a time-changing magnetic field to the fluid, a signal conversion unit (5) which extracts a ∂A/∂t component from the resultant electromotive force of the electromotive force based on the ∂A/∂t component irrelevant to the flow velocity of the fluid and the electromotive force based on a v×B component originating from the flow velocity of the fluid, which are detected by the electrodes (2a,2b), and a flow rate output unit (6) which extracts only the v×B component by removing the extracted ∂A/∂t component from the resultant electromotive force, and calculates the flow rate of the fluid based on the v×B component.
REFERENCES:
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patent: 4726236 (1988-02-01), Wada
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patent: 2007/0220993 (2007-09-01), Yamamoto
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Boccalon et al., ‘Noninvasitve electromagnetic blood flowmeter Theoretical aspects and technical evaluation’, 1982, Medical & Biological Eng. & Computer, pp. 671-680.
JNMIHF edition, “Flow Rate Measurement A to Z for Instrumentation Engineers”, Kogyo Gijutusha, 1995, pp. 143-160, Abstract.
Blakely & Sokoloff, Taylor & Zafman
Desta Elias
Raymond Edward
Yamatake Corporation
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