Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1982-04-26
1984-05-22
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
73 32A, G01F 180
Patent
active
044494149
ABSTRACT:
Apparatus for measuring mass flow or density of fluid has a turbine mounted resiliently by torque rods within the fluid-flow line. The turbine has a number of vanes that extend radially to define passages parallel to the flow of fluid in the fluid-flow line. A torque driver causes oscillatory rotation of the turbine so as to give fluid in the passages a component of displacement at right angles to the passages. The turbine is driven simultaneously at two frequencies, displacement being sensed by a pick-off. The first frequency f.sub.90 is adjusted so that a 90.degree. phase difference is produced between the drive signal and the turbine displacement--the density of fluid being derived from this frequency. The second frequency f.sub.D is a fixed fraction F of the first frequency, the phase difference between the second frequency and turbine displacement being used to derive an indication of mass flow.
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Goldstein Herbert
Smiths Industries Public Limited Company
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