| 摘要 |
An increased sensitivity Coriolis flowmeter (310) hav- ing one or more drivers (D) oscillating a flow tube (130), or tubes (130, 130'), at pre-determined frequencies thereby pro- ducing nodes (N) including active nodes (AN) and/or static nodes (SN) at points along the flow tube(s) (130, 130'). The increased sensitivity of the present flowmeter (310) is pro- vided by controllably locating sensors (S) in close proximity to the static nodes (SN) and/or active nodes (AN). In a first embodiment, the flow tubes (130, 130') are oscillated in a manner generating a single active node (AN) with sensors (S) positioned in close proximity to, and on opposing sides of, the active node (AN). In a second embodiment, the flow tubes (130, 130') are oscillated in a manner generating mul- tiple active nodes (AN) where the sensors (S) are located on opposing sides of each active node (AN), or on opposing flow tubes (130, 130') where one sensor (S) is above an active node (AN) on one leg and a second sensor (S) is below the active node (AN) on the opposing leg. In another embodiment, sen- sors (S) are positioned in close proximity to static nodes (SN) in addition to the sensor (S) positions for active nodes (AN) as previously stated. In all embodiments, the sensors (S) are controllably positioned proximate to active nodes (AN) and/or static nodes (SN) in a manner that maximizes the signal to noise ratio of the signal generated by the sensor electronics.
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