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Coriolis mass flowmeter providing high accuracy, stable excitation with a short delay while employing digital signal processing
Coriolis mass flowmeter providing high accuracy, stable excitation with a short delay while employing digital signal processing
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机译:科里奥利质量流量计在采用数字信号处理的同时,可提供高精度,短时延迟的稳定激励
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摘要
First and second ΔΣ modulators convert output signals of two sensors into pulse density signals. First and second LPFs convert the pulse density signals into multi-bit signals. A signal computing module calculates a mass flow rate based on the multi-bit signals. A resonance circuit generates an excitation signal based on the output signals of the sensors. A drive output module amplifies the excitation signal. An exciter excites the measurement tube using an amplified excitation signal. A multiplier amplifies one of the pulse density signals to generate a multi-bit signal. An amplification factor controller controls an amplification factor of the multiplier based on the multi-bit signal. A third ΔΣ modulator converts an amplified signal into a pulse density signal. A DAC generates the excitation signal based on the pulse density signal.
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