Acoustic wave supressor for Coriolis flow meter

Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...

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73272R, 138 30, 181206, G01F 184

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active

048318850

ABSTRACT:
A Coriolis-type mass flowmeter in which the flow tube is vibrated at a resonance frequency approximately equal to the frequency for forced or natural vibration in a higher anti-symmetric mode, such as the second mode. In the preferred embodiment the flowmeter is symmetrical and has sections of oval cross-section that provide low bending resistance to the vibration at the points where the amplitude of vibration is the largest. The preferred embodiment uses electronic signal detection/processing means that generates two signals proportional to flow tube velocity in the direction of vibration of equal distance but on opposite sides of the plane of symmetry of the tube, generates a sum and a difference of the two signals, integrates the sum, demodulates the integrated signal and the difference of the two signals to produce peak amplitude signals, and divides the peak amplitude signals to produce an output that is proportional to mass flow rate. The preferred embodiment is further equipped with a novel acoustic wave suppressor, including a bypass conduit and a flexible diaphragm mounted within the flow tube, which suppresses acoustic waves by transmitting them across the diaphragm, thus isolating the flowmeter from the acoustic waves.

REFERENCES:
patent: 3397581 (1968-08-01), Bush
patent: 4011757 (1977-03-01), Baatz
patent: 4263812 (1981-04-01), Zeigner
patent: 4393720 (1983-07-01), Tanahashi et al.
patent: 4393724 (1983-07-01), Werkmann et al
patent: 4555952 (1985-12-01), Jenkins
patent: 4570745 (1986-02-01), Sparks et al.

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