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1. WO1996002812 - INCREASED SENSITIVITY CORIOLIS EFFECT FLOWMETER USING NODAL-PROXIMATE SENSORS

Publication Number WO/1996/002812
Publication Date 01.02.1996
International Application No. PCT/US1995/008491
International Filing Date 06.07.1995
Chapter 2 Demand Filed 12.01.1996
IPC
G01F 1/84 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Coriolis or gyroscopic mass flowmeters
CPC
G01F 1/8413
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
8409constructional details
8413means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
G01F 1/8436
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
8409constructional details
8436signal processing
G01F 1/8472
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
845arrangements of measuring means, e.g., of measuring conduits
8468vibrating measuring conduits
8472having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
G01F 1/8477
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
845arrangements of measuring means, e.g., of measuring conduits
8468vibrating measuring conduits
8472having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
8477with multiple measuring conduits
G01F 1/849
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
845arrangements of measuring means, e.g., of measuring conduits
8468vibrating measuring conduits
849having straight measuring conduits
Applicants
  • MICRO MOTION, INC. [US/US]; 7070 Winchester Circle Boulder, CO 80301, US
Inventors
  • PATTEN, Andrew, Timothy; US
  • STACK, Charles, Paul; US
  • LEVIEN, Andrew, Keith; US
Agents
  • GUETLICH, Mark, A.; Duft, Graziano & Forest, P.C. Suite 140 1790-30th Street Boulder, CO 80301-1018, US
Priority Data
08/277,66120.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) INCREASED SENSITIVITY CORIOLIS EFFECT FLOWMETER USING NODAL-PROXIMATE SENSORS
(FR) DEBITMETRE UTILISANT L'EFFET DE CORIOLIS, A SENSIBILITE AUGMENTEE ET AVEC DES DETECTEURS PLACES PRES DES NOEUDS
Abstract
(EN)
An increased sensitivity Coriolis flowmeter (310) having one or more drivers (D) oscillating a flow tube (130), or tubes (130, 130'), at pre-determined frequencies thereby producing 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 provided 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 multiple 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, sensors (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.
(FR)
Un débitmètre (310) utilisant l'effet de Coriolis à sensibilité augmentée a un ou plusieurs dispositifs (D) pour faire vibrer un tube d'écoulement (130) ou des tubes d'écoulement (130, 130') à des fréquences prédéterminées, ce qui produit des noeuds (N) comprenant des noeuds actifs (AN) et/ou des noeuds statiques (SN) à des points suivant la longueur du ou des tubes d'écoulement (130, 130'). La sensibilité accrue du débitmètre décrit (310) est assurée par des détecteurs (S) que l'on positionne tout près des noeuds statiques (SN) et/ou des noeuds actifs (AN). Dans une première forme d'exécution, on fait osciller les tubes d'écoulement (130, 130') de manière à générer un seul noeud actif (AN), les détecteurs (S) étant positionnés près du noeud actif (AN) et sur les côtés opposés de celui-ci. Dans une seconde forme d'exécution, on fait osciller les tubes d'écoulement (130, 130') pour générer de multiples noeuds actifs (AN), les détecteurs (S) étant positionnés sur les côtés opposés de chaque noeud actif (AN), ou sur les tubes d'écoulement opposés (130, 130'), un détecteur (S) étant positionné au-dessus d'un noeud actif (AN) sur une branche et un second détecteur (S) en dessous du noeud actif (AN) sur la branche opposée. Dans une autre forme d'exécution, les détecteurs (S) sont positionnés tout près des noeuds statiques (SN) en plus des détecteurs (S) positionnés sur les noeuds actifs (AN) comme précédemment. Dans toutes les formes d'exécution, les détecteurs (S), dont la position est ajustable, sont positionnés près des noeuds actifs (AN) et/ou des noeuds statiques (SN) d'une manière qui maximalise le rapport du signal sur le bruit de fond produit par l'électronique des détecteurs.
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