Mode splitting resonator for coriolis flowmeter balance bar
AssigneeMicro Motion, Inc.
InventorsMartin Andrew Schlosser, Frederick Scott Schollenberger
Life of this patent
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Abstract
A mode splitter (300) for a balance bar (150) of a Coriolis flow meter (100) is disclosed. The mode splitter (300) comprises a mass portion (302), and a first coupling portion (304a) coupled to the mass portion (302). The first coupling portion (304a) has a first stiffness in a drive direction (Y) and a second stiffness direction in an orthogonal direction (Z), and the orthogonal direction (Z) is orthogonal to both the drive direction (Y) and a longitudinal direction of the balance bar (150). The second stiffness is different than the first stiffness.
Claims19
A mode splitter (300) for coupling to a balance bar (150) or a flow tube (130) of a Coriolis flow meter (700), the mode splitter (300) comprising:
- a mass portion (302);
- and
- a first coupling portion (304a) coupled to the mass portion (302), wherein the first coupling portion (304a) has a first stiffness in a drive direction (Y) and a second stiffness in an orthogonal direction (Z), the orthogonal direction (Z) being orthogonal to both the drive direction (Y) and a longitudinal direction of the balance bar (150), the second stiffness being different than the first stiffness.
A Coriolis flow meter (700) comprising:
- a flow tube (130);
- a driver (180) configured to oscillate the flow tube (130);
- at least one pick-off sensor (170L, 170R) configured to measure a motion of the flow tube (130);
- a first balance bar (150);
- and
- a first mode splitter (300) coupled to at least one of the first balance bar (150) or the flow tube (130), the first mode splitter (300) comprising:
- a mass portion (302);
- and
- a first coupling portion (304a) coupled to the mass portion (302), wherein the first coupling portion (304a) has a first stiffness in a drive direction (Y) and a second stiffness in an orthogonal direction (Z), the orthogonal direction (Z) being orthogonal to both the drive direction (Y) and a longitudinal direction of the balance bar (150), the second stiffness being different than the first stiffness.
A method for assembling the Coriolis flow meter (700), the method comprising:
- providing a flow tube (130);
- coupling a driver (180) configured to oscillate the flow tube (130) to the flow tube (130);
- coupling at least one pick-off sensor (170L, 170R) configured to measure a motion of the flow tube (130) to the flow tube (130);
- coupling a brace bar (140, 140′) to the flow tube (130);
- coupling a balance bar (150) to the brace bar (140, 140′);
- and
- coupling a mode splitter (300) to at least one of the flow tube (130) or the balance bar (150), the mode splitter (300) comprising:
- a mass portion (302);
- and
- a first coupling portion (304a) coupled to the mass portion (302), wherein the first coupling portion (304a) has a first stiffness in a drive direction (Y) and a second stiffness in an orthogonal direction (Z), the orthogonal direction (Z) being orthogonal to both the drive direction (Y) and a longitudinal direction of the balance bar (150), the second stiffness being different than the first stiffness.
Dependencies are inferred from the claim text.