Coriolis mass flow and density sensor actuation using a phase-locked loop

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    This paper reports on novel feedback based actua-tion electronics that use the voltage from the induction track of a Coriolis mass flow sensor as input signal for a phase-locked loop. The phase-locked loop consists of a phase detector that measures the difference between the actuation voltage and the induction voltage from the Coriolis mass flow sensor. A voltage controlled oscil-lator is directly tuned by this phase mismatch and synthesizes an harmonic signal for actuation. Therefore, the frequency of the signal synthesized by the phase-locked loop will gradually be adjusted to the resonance frequency of the Coriolis mass flow sensor, making it more robust to disturbances. Besides, waveform shape and amplitude can be easily altered. First experimental results show that the phase-locked loop controls the frequency as a function of density for different fluids. Stability is tested for nitrogen and shows a standard deviation of 0.14818 Hz for 20 ks.
    Original languageEnglish
    Title of host publicationThe 3rd Conference on MicroFluidic Handling Systems, MFHS 2017
    Subtitle of host publicationConference Proceedings
    EditorsDennis Alveringh
    Place of PublicationEnschede
    PublisherUniversity of Twente
    Number of pages4
    Publication statusPublished - 4 Oct 2017


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