Coriolis mass flow rate meter having four pulse harmonic rejection
First Claim
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1. A Coriolis mass flow rate meter comprising:
- at least one flow conduit;
means for sensing movement of said flow conduit caused by opposing Coriolis forces induced by passage of a fluid through said flow conduit and for producing first and second sensor signals responsive to the sensed movement of said flow conduit;
means for oscillating the flow conduit; and
circuit means responsive to said first and second sensor signals for providing a mass flow rate value of the fluid, said circuit means comprising;
means responsive to said first and second sensor signals for determining a time difference occurring among first and second measurement points located on said first sensor signal and a reference point situated on the second sensor signal and which temporally occurs between said first and second measurement points, wherein said time difference in duration occurring between the duration of a first interval of time occurring between said first measurement point and said reference point and the duration of a second interval of time occurring between said reference point and said second measurement point and wherein said time difference is a linear function of the value of the mass flow rate of the fluid passing through said flow conduit; and
means responsive to said determined time difference for generating the mass flow rate value.
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Abstract
Apparatus and accompanying methods are disclosed for use in a Coriolis mass flow rate meter for providing a mass flow rate signal that has a substantially reduced harmonic content. Specifically, this apparatus measures the Coriolis force induced time interval, Δt, by measuring the time intervals that occur between each of two measurement points situated on one, e.g. the right, position (or velocity) waveform and a reference point situated on the other, e.g. left, position (or velocity) waveform and which temporarily occurs between each of the two measurement points.
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Citations
23 Claims
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1. A Coriolis mass flow rate meter comprising:
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at least one flow conduit; means for sensing movement of said flow conduit caused by opposing Coriolis forces induced by passage of a fluid through said flow conduit and for producing first and second sensor signals responsive to the sensed movement of said flow conduit; means for oscillating the flow conduit; and circuit means responsive to said first and second sensor signals for providing a mass flow rate value of the fluid, said circuit means comprising; means responsive to said first and second sensor signals for determining a time difference occurring among first and second measurement points located on said first sensor signal and a reference point situated on the second sensor signal and which temporally occurs between said first and second measurement points, wherein said time difference in duration occurring between the duration of a first interval of time occurring between said first measurement point and said reference point and the duration of a second interval of time occurring between said reference point and said second measurement point and wherein said time difference is a linear function of the value of the mass flow rate of the fluid passing through said flow conduit; and means responsive to said determined time difference for generating the mass flow rate value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a Coriolis mass flow rate meter having at least one flow conduit, a method of measuring mass flow rate of a fluid passing through said meter comprising the steps of:
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sensing movement of said flow conduit caused by opposing Coriolis forces induced by passage of a fluid through said flow conduit and for producing first and second sensor signals responsive to said sensed movement of said flow conduit; oscillating the flow conduit; determining, in response to said first and second sensor signals, a time difference occurring among first and second measurement points located on said first sensor signal and a reference point situated on the second sensor signal and which temporally occurs between said first and second measurement points, wherein said time difference substantially equals a difference in duration occurring between the duration of a first interval of time occurring between said first measurement point and said reference point and the duration of a second interval of time occurring between said reference point and said second measurement point and wherein said difference is a linear function of the value of the mass flow rate of the fluid passing through said flow conduit; and generating, in response to said determined time difference, a measured value of the mass flow rate of said fluid. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification