Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1992-01-15
1994-05-03
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
G01F 186
Patent
active
053076893
ABSTRACT:
A mass flowmeter has a U-shaped sensor tube provided on a support base which is supported on a vibration absorbing member, and both ends of the sensor tube are respectively connected to an inlet and an outlet of a manifold. Vibrators are provided at an intermediate part of each straight tube part provided between the inlet and outlet sides of the sensor tube. Pickups are provided on the upstream and downstream sides of each vibrator so as to detect the displacement of the sensor tube. An external vibration is in an opposite direction between the inlet and outlet sides relative to the vibrating direction. Hence, outputs of the pickups located on the upstream sides of the vibrators are added, and outputs of the pickups located on the downstream sides of the vibrators are added. The external vibration is cancelled by obtaining a phase difference of the two added values.
REFERENCES:
patent: 4187721 (1980-02-01), Smith
Hasegawa Hiroaki
Koido Hiroshi
Miyata Yasuji
Nishiyama Shigeru
Goldstein Herbert
Meller Michael N.
Tokico Ltd.
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