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Vibratory meter and method for determining resonant frequency

  • US 9,395,236 B2
  • Filed: 07/13/2011
  • Issued: 07/19/2016
  • Est. Priority Date: 07/13/2011
  • Status: Active Grant
First Claim
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1. A vibratory meter (5) comprising one or more flow conduits (103), one or more pickoff sensors (105, 105

  • ) affixed to the one or more flow conduits (103), and a driver (104) configured to vibrate the one or more flow conduits (103), with the vibratory meter (5) being characterized by;

    meter electronics (20) coupled to the one or more pickoff sensors (105, 105

    ) and to the driver (104), with the meter electronics (20) being configured to vibrate the one or more flow conduits (103) of the vibratory meter (5) using a drive signal including an initial vibration frequency and to receive a pickoff sensor signal from the one or more pickoff sensors (105, 105

    ) in response, iteratively offset a phase difference between the drive signal and the pickoff sensor signal by a predetermined phase increment and measure a resulting vibrational frequency and amplitude, with the offsetting operatively resulting vibration frequency being used to sweep over a predetermined vibration frequency range and therefore generating a plurality of vibration amplitudes and a corresponding plurality of vibration frequencies, and determine a substantially maximum amplitude response in the plurality of vibration amplitudes and designate the corresponding vibration frequency as comprising a resonant frequency.

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