High speed frequency and phase estimation for flow meters
First Claim
1. Meter electronics (20) for processing sensor signals in a flow meter, comprising an interface (201) for receiving a first sensor signal and a second sensor signal and a processing system (203) in communication with the interface (201), with the meter electronics (20) being characterized by:
- the processing system (203) being configured to generate a first ninety degree phase shift sensor signal from the first sensor signal, generate a second ninety degree phase shift sensor signal from the second sensor signal, compute a frequency from the first sensor signal and the first ninety degree phase shift sensor signal, and substantially simultaneously compute a phase difference from the first sensor signal, the second sensor signal, and the first ninety degree phase shift sensor signal or the second ninety degree phase shift sensor signal.
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Accused Products
Abstract
Meter electronics (20) for processing sensor signals in a flow meter and for computing mass flow rate, density or volume flow rate includes an interface (201) for receiving a first sensor signal and a second sensor signal and a processing system (203) in communication with the interface (201) and configured to generate a ninety degree phase shift from the first sensor signal with a Hilbert transform and compute a phase difference from the ninety degree phase shift, the first sensor signal and the second sensor signal. A frequency is computed from the first sensor signal and the ninety degree phase shift. A second ninety degree phase shift can be generated from the second sensor signal.
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Citations
12 Claims
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1. Meter electronics (20) for processing sensor signals in a flow meter, comprising an interface (201) for receiving a first sensor signal and a second sensor signal and a processing system (203) in communication with the interface (201), with the meter electronics (20) being characterized by:
the processing system (203) being configured to generate a first ninety degree phase shift sensor signal from the first sensor signal, generate a second ninety degree phase shift sensor signal from the second sensor signal, compute a frequency from the first sensor signal and the first ninety degree phase shift sensor signal, and substantially simultaneously compute a phase difference from the first sensor signal, the second sensor signal, and the first ninety degree phase shift sensor signal or the second ninety degree phase shift sensor signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for processing sensor signals in a flow meter, the method comprising receiving a first sensor signal and a second sensor signal, with the method being characterized by:
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generating a first ninety degree phase shift sensor signal from the first sensor signal; generating a second ninety degree phase shift sensor signal from the second sensor signal; computing a frequency from the first sensor signal and the first ninety degree phase shift sensor signal, and substantially simultaneously computing a phase difference from the first sensor signal, the second sensor signal, and the first ninety degree phase shift sensor signal or the second ninety degree phase shift sensor signal. - View Dependent Claims (7, 8, 9)
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10. A method for processing sensor signals in a flow meter, the method comprising receiving a first sensor signal and a second sensor signal, with the method being characterized by:
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generating a first ninety degree phase shift sensor signal from the first sensor signal; generating a second ninety degree phase shift sensor signal from the second sensor signal; computing a phase difference from the first sensor signal, the second sensor signal, and the first ninety degree phase shift sensor signal or the second ninety degree phase shift sensor signal; substantially simultaneously computing a frequency from the first sensor signal and the first ninety degree phase shift sensor signal; and computing one or more of a mass flow rate, a density, or a volume flow rate. - View Dependent Claims (11, 12)
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Specification