Coriolis frequency tracking

摘要

Motion is induced in a conduit such that the conduit vibrates in a major mode of vibration having a major amplitude and a minor mode of vibration having a minor amplitude. The major amplitude is larger than the minor amplitude, the major mode of vibration has a first frequency of vibration and the minor mode of vibration has a second frequency of vibration, and the minor mode of vibration interferes with the major mode of vibration to cause a beat signal having a frequency related to the first frequency of vibration and the second frequency of vibration. The frequency of the beat signal is determined, and the second frequency of vibration is determined based on the determined frequency of the beat signal.

主权项

1. A method comprising:
inducing motion in a conduit such that the conduit vibrates in a major mode of vibration having a major amplitude and a minor mode of vibration having a minor amplitude, wherein:
the major amplitude is larger than the minor amplitude, andthe major mode of vibration has a first frequency of vibration and the minor mode of vibration has a second frequency of vibration, accessing a first sensor signal from a first sensor configured to sense the motion of the conduit; accessing a second sensor signal from a second sensor configured to sense the motion of the conduit; determining a first amplitude of oscillation signal based on the first sensor signal; determining a second amplitude of oscillation signal based on the second sensor signal; determining a beat signal based on the first amplitude of oscillation signal and the second amplitude of oscillation signal; determining a frequency of the beat signal, wherein the frequency of the beat signal is related to the first frequency of vibration and the second frequency of vibration; and determining the second frequency of vibration based on the determined frequency of the beat signal.