| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal processing apparatus, capable of always measuring with a constant precision even in the presence of the temperature change of a fluid to be measured, the mixing-in of bubbles and the rapid change from gas to liquid, having a high filtering capacity, and capable of performing a phase measurement with reduced computational complexity. SOLUTION: A Coriolis flowmeter for obtaining the mass flow rate and/or density by detecting a phase difference and/or vibration frequency proportional to a Coriolis force by vibrating at least one or a pair of flow tubes by actuating a vibrator is configured of, a frequency meter 110 for measuring the signal frequency from the one sensor, the signal frequency being obtained from vibration sensors 7, 8 by performing A/D conversion, a transmitter 120 for transmitting a desired frequency signal based on the frequency, frequency converting units 130, 140 for performing frequency conversion by adding (or subtracting) the signal of the vibration detection sensors 7, 8 and the output signal of the transmitter 120 and a phase difference measurement unit 150 for performing the phase difference measurement of the signal converted by the frequency converters 130, 140. COPYRIGHT: (C)2010,JPO&INPIT |
