Mass flow meter having an oscillation sensor and method for eliminating noise signals from the measurement signal
First Claim
1. A mass flow meter having at least one measurement tube, through which mass flows, as an oscillation body which can be set in mechanical oscillation by means of an excitation unit, the oscillation behavior of which varying as a function of the mass flow can be recorded via at least one oscillation sensor in order to determine the mass flow, wherein in order to eliminate noise signals from the measurement voltage (sen) recorded via the oscillation sensor computational technology means are provided for forming a complex conjugate spectrum (|sa1j|) from the spectrum of the excitation voltage (seD) as well as a vector product between this (|sa1j|) and the measurement voltage (sen) for the purpose of filtering, in order, by further computational technology means for inverse Fourier transformation, to obtain the signal relationship associated with the vector product between the excitation voltage (seD) and the measurement voltage (sen) so that the processed measurement voltage (sa1) resulting therefrom then predominantly comprises useful signal component.
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Accused Products
Abstract
Mass flow meter having at least one measurement tube, through which mass flows, as an oscillation body which can be set in mechanical oscillation by means of an excitation unit, the oscillation behavior of which varying as a function of the mass flow can be recorded via at least one oscillation sensor in order to determine the mass flow, wherein in order to eliminate noise signals from the measurement voltage (sen) recorded via the oscillation sensor computational technology means are provided for forming a complex conjugate spectrum (|sa1j|) from the spectrum of the excitation voltage (seD) as well as a vector product between this (|sa1j|) and the measurement voltage (sen) for the purpose of filtering, in order, by further computational technology means for inverse Fourier transformation, to obtain the signal relationship associated with the vector product between the excitation voltage (seD) and the measurement voltage (sen) so that the processed measurement voltage (sal) resulting therefrom then predominantly comprises a useful signal component.
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Citations
15 Claims
- 1. A mass flow meter having at least one measurement tube, through which mass flows, as an oscillation body which can be set in mechanical oscillation by means of an excitation unit, the oscillation behavior of which varying as a function of the mass flow can be recorded via at least one oscillation sensor in order to determine the mass flow, wherein in order to eliminate noise signals from the measurement voltage (sen) recorded via the oscillation sensor computational technology means are provided for forming a complex conjugate spectrum (|sa1j|) from the spectrum of the excitation voltage (seD) as well as a vector product between this (|sa1j|) and the measurement voltage (sen) for the purpose of filtering, in order, by further computational technology means for inverse Fourier transformation, to obtain the signal relationship associated with the vector product between the excitation voltage (seD) and the measurement voltage (sen) so that the processed measurement voltage (sa1) resulting therefrom then predominantly comprises useful signal component.
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7. A method for eliminating noise signals from the measurement voltage (sen) of an oscillation sensor in flow meters, comprising the computation steps:
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forming the complex conjugate spectrum (|sa1j|) from the spectrum of the excitation voltage (seD), forming the vector product between the complex conjugate spectrum (|sa1j|) and the measurement voltage (sen) for the purpose of filtering, carrying out an inverse Fourier transformation in order to evaluate the signal relationship, associated with the vector product, between the excitation voltage (seD) and the measurement voltage (sen), so that the processed measurement voltage (sa1) resulting therefrom then comprises useful signal component. - View Dependent Claims (8, 9, 10, 14)
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15. A mass flow meter comprising:
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at least one measurement tube, through which mass flows, as an oscillation body which can be set in mechanical oscillation by means of an excitation unit; an excitation unit which can be set in mechanical oscillation to the mass flow as an oscillation body; at least one oscillation sensor to record the oscillation behavior of the mass flow; and computational technology means provided to eliminate noise signals from a measurement voltage (sen) recorded via the oscillation sensor to form a complex conjugate spectrum (|sa1j|) from a spectrum of an excitation voltage (seD) as well as a vector product between this (|saij|) and the measurement voltage (sen) for the purpose of filtering to obtain the signal relationship associated with the vector product between the excitation voltage (seD) and the measurement voltage (sen) so that a processed measurement voltage (sa) results therefrom.
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Specification