SIGNAL PROCESSING METHOD, SIGNAL PROCESSING DEVICE, AND CORIOLIS FLOW METER

摘要

In a Coriolis flowmeter, at least one flow tube or a pair of flow tubes in a measurement flow tube is alternately driven and at least one of a phase difference and a vibration frequency proportional to a Coriolis force acting on the flow tubes is detected by a velocity sensor or acceleration sensor, to thereby obtain a mass flow rate and a density of a fluid to be measured. A signal processing apparatus for the Coriolis flowmeter comprises a transmitter for transmitting a frequency signal which is modulatable; and a frequency conversion section for performing frequency conversion to add or subtract an output frequency F x from the transmitter to or from an input frequency detected by the velocity sensor or acceleration sensor and shifting a frequency value obtained by the frequency conversion to a constant value.