Meter electronics and methods for determining a phase difference between a first sensor signal and a second sensor signal of a flow meter
First Claim
1. Meter electronics (20) for determining a phase difference between a first sensor signal and a second sensor signal of 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) and configured to receive the first sensor signal and the second sensor signal, generate a ninety degree phase shift from the first sensor signal, compute a sensor signal frequency from the first sensor signal and the ninety degree phase shift, generate sine and cosine signals using the computed sensor signal frequency, and quadrature demodulate the first sensor signal and the second sensor signal using the sine and cosine signals in order to determine the phase difference between the first sensor signal and the second sensor signal.
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Accused Products
Abstract
Meter electronics (20) for processing sensor signals in a flow meter is provided according to an embodiment of the invention. The meter electronics (20) 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 receive the first sensor signal and the second sensor signal, generate a ninety degree phase shift from the first sensor signal, and compute a frequency from the first sensor signal and the ninety degree phase shift. The processing system (203) is further configured to generate sine and cosine signals using the frequency, and quadrature demodulate the first sensor signal and the second sensor signal using the sine and cosine signals in order to determine the phase difference.
37 Citations
11 Claims
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1. Meter electronics (20) for determining a phase difference between a first sensor signal and a second sensor signal of a flow meter, comprising:
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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 receive the first sensor signal and the second sensor signal, generate a ninety degree phase shift from the first sensor signal, compute a sensor signal frequency from the first sensor signal and the ninety degree phase shift, generate sine and cosine signals using the computed sensor signal frequency, and quadrature demodulate the first sensor signal and the second sensor signal using the sine and cosine signals in order to determine the phase difference between the first sensor signal and the second sensor signal. - View Dependent Claims (2, 3, 4)
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5. A method for determining a phase difference between a first sensor signal and a second sensor signal of a flow meter, the method comprising:
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receiving the first sensor signal and the second sensor signal; generating a ninety degree phase shift from the first sensor signal; computing a sensor signal frequency from the first sensor signal and the ninety degree phase shift; generating sine and cosine signals using the computed sensor signal frequency; and quadrature demodulating the first sensor signal and the second sensor signal using the sine and cosine signals in order to determine the phase difference between the first sensor signal and the second sensor signal. - View Dependent Claims (6, 7, 8)
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9. A method for determining a phase difference between a first sensor signal and a second sensor signal of a flow meter, the method comprising:
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receiving the first sensor signal and the second sensor signal; generating a ninety degree phase shift from the first sensor signal; computing a sensor signal frequency from the first sensor signal and the ninety degree phase shift; generating sine and cosine signals using the computed sensor signal frequency; quadrature demodulating the first sensor signal and the second sensor signal using the sine and cosine signals, with the quadrature demodulating generating a first demodulated signal and a second demodulated signal; filtering the first demodulated signal and the second demodulated signal in order to remove high frequency components; and cross-correlating the first demodulated signal and the second demodulated signal in order to determine the phase difference between the first sensor signal and the second sensor signal. - View Dependent Claims (10, 11)
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Specification