Increased sensitivity coriolis effect flowmeter using nodal-prox

Details Increased sensitivity coriolis effect flowmeter using nodal-prox Increased sensitivity coriolis effect flowmeter using nodal-prox

1994-07-20

1996-03-12

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

7386137, G01F 184

Patent

active

054976669

ABSTRACT:
An increased sensitivity Coriolis flowmeter having one or more drivers oscillates a flow tube, or tubes, at pre-determined frequencies thereby producing active and/or static nodes at points along the flowtube(s). The increased sensitivity of the present flowmeter is provided by controllably locating sensors in close proximity to the static nodes and/or active nodes. In a first embodiment, the flowtubes are oscillated in a manner generating a single active node with sensors positioned in close proximity to, and on opposing sides of, the active node. In a second embodiment, the flowtubes are oscillated in a manner generating multiple active nodes where the sensors are located on opposing sides of each active node, or on opposing flowtubes where one sensor is above an active node on one leg and a second sensor below the active node on the opposing leg. In another embodiment, sensors are positioned in close proximity to static nodes in addition to the sensor positions for active nodes as previously stated. In all embodiments, the sensors are controllably positioned proximate to active nodes and/or static nodes in a manner that maximizes the signal to noise ratio of the signal generated by the sensor electronics.

REFERENCES:
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patent: 5321991 (1994-06-01), Kalotay
patent: 5349872 (1994-10-01), Kalotay et al.
Coriolis Effect in Mass Flow Metering, H. Rasziller and F. Durst, Erlangen--Applied Mechanics, pp. 192-214 61 (1991), Springer-Verlag 1991.

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