Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1990-06-14
1993-05-04
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386111, G01F 158
Patent
active
052071057
ABSTRACT:
An apparatus in which a magnetic field is generated by an excitation coil provided in the outside of a conduit and electromotive force generated in electrodes attached on the conduit is detected to thereby measure a flow rate of a fluid flowing in the conduit, in which the conduit is made thinner in a manner so that a ratio of the axial length of the conduit to the inside diameter of the conduit is set to a value within a range of from 0.2 to 1.0, and in which correction data previously analyzed in accordance with magnetic permeability and inside surface conductivity of a mate piping to which the conduit is to be connected are stored so that a detection signal from the electrodes is corrected on the basis of the correction data to thereby measure the flow rate of the fluid flowing in the conduit.
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Neue Kompakte Magnetisch-Induktive Durchflussmesser mit Digitaler Signalverarbeitung, F. Hoffman (May 1988), pp. 240-245.
Fukunaga Masao
Ikegawa Masahiro
Kaiho Masayuki
Uematsu Ikuo
Goldstein Herbert
Hitachi , Ltd.
Shopbell Elizabeth L.
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