| 摘要 |
The mass flowmeter of the present invention comprises at least one conduit including a three hundred sixty degree loop disposed intermediate inlet and outlet legs fixedly anchored to a rigid support wherein two sections of the three hundred sixty degree loop respectively adjacent to the inlet and outlet legs cross one another, and an electromagnetic vibrator exerting oscillatory forces on the two halves of the conduit at the crossing point of the conduit, which induces relative flexural vibrations of the two halves of the conduit, wherein the flexural vibrations have a first mode antisymmetric about the midsection of the conduit that is independent of the mass flow rate, and a second mode symmetric and dependent on the mass flow rate. The mass flow rate through the conduit is determined by measuring the phase difference in the flexural vibrations between the two halves of the conduit. The principles of the present invention also teach other embodiments of the mass flowmeter comprising a pair of conduits disposed in a parallel or series arrangement, wherein the flexural vibrations of the pair of the conduits have first mode independent of the mass flow and a second mode dependent on the mass flow rate, which second mode produces phase difference in the flexural vibrations between the pair of the conduits that determines mass flow rate.
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