A MEMS Coriolis Mass Flow Sensing System with Combined Drive and Sense Interface

A. C. De Oliveira, T. V.P. Schut, J. Groenesteijn, Q. Fan, R. J. Wiegerink, K. A.A. Makinwa

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)

Abstract

This paper describes an interface circuit for a MEMS Coriolis mass flow sensor that combines both drive and sense circuitry. The MEMS sensor consists of a suspended resonant tube, which is read-out by comb capacitors and driven into oscillation by current flowing through a drive coil in a magnet field. The interface circuit comprises a low-noise front-end that performs capacitance-to-voltage (C/V) conversion, and a drive-loop with automatic amplitude control. Drive motion can also be detected from the output of the front-end, allowing both drive and sense functions to be combined. The front-end is chopped to mitigate its 1/ f noise. When implemented with commercial off-the-shelf (COTS) components, the proposed interface draws 250 mA from a single 5-V supply. Mass flow measurements with Nitrogen gas (N2) show that the sensor's drive frequency drifts by less than 1 mHz (rms) per hour, while its zero stability is less than 2.6 mg/h during an 80s measurement.

Original languageEnglish
Title of host publication2019 IEEE Sensors, SENSORS 2019 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages4
Volume2019-October
ISBN (Electronic)9781728116341
DOIs
Publication statusPublished - 1 Oct 2019
Event18th IEEE Sensors, SENSORS 2019 - Montreal, Canada
Duration: 27 Oct 201930 Oct 2019

Conference

Conference18th IEEE Sensors, SENSORS 2019
CountryCanada
CityMontreal
Period27/10/1930/10/19

Keywords

  • Coriolis
  • gyroscopic
  • mass flow
  • MEMS
  • sensor interface

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