Vibration type measuring instrument

Details Vibration type measuring instrument Vibration type measuring instrument

1996-08-29

1998-11-03

Biegel, Ronald L.

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

73861356, G01F 184

Patent

active

058311785

ABSTRACT:
A vibration type measuring instrument measures at least one of a mass flow rate and a density of a fluid flowing through a straight measurement pipe by vibrating the measurement pipe, obtains a frequency ratio of a resonant frequency of a first vibration mode to a resonant frequency of a second vibration mode of the measurement pipe, and corrects a measured value of at least one of the mass flow rate and the density according to the frequency ratio. The instrument includes a first vibration detector for detecting at least one of a vibration generated in the measurement pipe depending on the mass flow rate and the resonant frequency of the first vibration mode of the measurement pipe; and a second vibration detector for detecting the resonant frequency of the second vibration mode of the measurement pipe. The second vibration detector is provided around an antinode of the second vibration mode of the measurement pipe to improve the detection sensitivity in the second vibration mode.

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patent: 5398554 (1995-03-01), Ogawa et al.
patent: 5448921 (1995-09-01), Cage et al.
patent: 5469748 (1995-11-01), Kalotay

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