Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1978-12-15
1980-12-23
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using differential pressure
7386152, G01F 138
Patent
active
042402948
ABSTRACT:
A flow meter for the registration of pulsating liquid flows, and preferably for registration of small blood flows. The flow is measured by means of a differential pressure measurement over a first flow resistance (I) having a resistance R.sub.1. The flow meter includes a high pressure part in the form of a flow resistance (II) and a lower pressure part in the form of a flow resistance (III), and these have the resistances R.sub.2 and R.sub.3, respectively. The resistances R.sub.1, R.sub.2 and R.sub.3 are selected so as to adjust the pressures on each side of the differential pressure meter in phase with each other independent of the frequency of the flow pulsations. Each resistance has a corresponding modulus of elasticity, and the resistances and moduli of elasticity are so related as to fulfill certain formulas.
REFERENCES:
patent: 3994166 (1976-11-01), Dower
patent: 4096746 (1978-06-01), Wilson et al.
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