Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2008-05-06
2008-05-06
Tsai, Carol S. W. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C038S050000, C038S100000, C073S861000, C073S861120
Reexamination Certificate
active
11582474
ABSTRACT:
An electromagnetic flowmeter includes a measuring tube, an electrode, an exciting unit, a signal conversion unit, and a flow rate calculating unit. The signal conversion unit extracts a ∂A/∂t component irrelevant to a flow velocity of the fluid and a v×B component originating from the flow velocity of the fluid from a resultant electromotive force of an electromotive force ∂A/∂t, with A, t, v, and B respectively representing a vector potential, a time, a flow velocity, and a magnetic flux density. The flow rate calculating unit extracts a variation component dependent on a parameter from the ∂A/∂t component, corrects a span which is a coefficient applied to a magnitude V of the flow velocity of the v×B component, and calculates the flow rate of the fluid from the v×B component whose span is corrected.
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JNMIFH edition, “Flow Rate Measurement form A to Z for Instrumentation Engineers”, Kogyo Gijutusha, 1995, pp. 147-148.
Blakely & Sokoloff, Taylor & Zafman
Tsai Carol S. W.
Yamatake Corporation
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