G - Physics – 01 – F
Patent
G - Physics
01
F
73/69
G01F 1/60 (2006.01)
Patent
CA 1126978
ABSTRACT OF THE DISCLOSURE An electromagnetic flowmeter in which fluid to be metered passes through a flow tube to intersect a magnetic field whereby the voltage in- duced in the fluid is transferred to a pair of electrodes mounted in the flow tube to yield a flow-induced signal. This field is established by an electromagnet supplied with excitation current through a periodically- operated switch to create a magnetic field which during each operating cycle is alternately turned on and off or reversed in flux direction at a pre- determined drive frequency, as a consequence of which the signal includes undesirable noise components formed by even and odd harmonics of the drive frequency. To suppress such harmonic noise, the flow-induced signal is applied to a converter that includes a pair of synchronous demodulators operating in phase opposition and so synchronized with the periodically- operated switch that one demodulator passes its output to an integrator dur- ing the first half cycle of the drive frequency only in a gating interval ti in which the magnetic field is turned on and is at a constant flux level, and the other demodulator thereafter passes its output to the same integrat- or during the second half cycle only in a gating interval t2 in which the magnetic field is turned off or is at a constant flux level in the reverse direction.
341149
Schmoock Roy F.
Yard John S.
Fischer & Porter Company
Smart & Biggar
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