| 摘要 |
FIELD: physics. ^ SUBSTANCE: in the Coriolis flow meter, the vibrator is configured to facilitate control of vibration of at least one flow tube or a pair of flow tubes (2 and 3). Phase difference and/or vibration frequency proportional to a Coriolis force acting on the flow tubes (2 and 3) is detected by vibration sensors in order to obtain specific mass flow rate and/or density of the measured fluid medium. The Coriolis flow meter includes a frequency measuring module (110) for measuring frequency, based on frequency of the input signal of one of the sensors, of two flow signals obtained through analogue-to-digital conversion for detection signals from a pair of vibration sensors (7 and 8), a transmitting device (120) for transmitting and outputting the required frequency-domain signal based on the measured frequency, frequency conversion modules (130 and 140) for summation (or subtraction) of detection frequencies from the pair of vibration sensors (7 and 8) with (or from) the output signal of the transmitting device (120) in order to perform frequency conversion, and a phase difference measuring module (150) for measuring phase difference between corresponding frequency-domain signals, which are detected by the pair of vibration sensors (7 and 8) and obtained via conversion through frequency conversion modules (130 and 140). ^ EFFECT: possibility of continuous measurement with constant accuracy, high throughput of filtration and fewer computations even when the fluid media changes. ^ 29 cl, 17 dwg |
