Composite flow meter

Details Composite flow meter Composite flow meter

1989-12-05

1991-06-04

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

73195, G01F 132, G01F 700

Patent

active

050203738

ABSTRACT:
This flow meter uses two known flow responsive techniques and combines them in a unique structure and system to form an improved flow meter whose range extends from low to high flow rates. The meter comprises a flow tube with a region of reduced diameter between its inlet and outlet. A microbridge flow sensor of a suitable type known in the art, which responds to thermal changes caused by changes in the flow rate, is located in the region of reduced diameter. A post downstream of the microbridge sensor creates Karman vortices whose frequencies are a function of flow rate and which are detected through ports in the tube by a suitable detector. The output of the microbridge is linear from low flow rates to a mid range and the Karman flow meter output is linear from the mid range to high flow rates. A correction factor is applied to the thermal flow meter output. The correction factor is determined by a ratio of the Karman flow meter output to the thermal output for a flow rate in the mid range, allowing a smooth transition from thermal to Karman outputs and vice versa in the mid range.

REFERENCES:
patent: 4320650 (1982-03-01), Kita
patent: 4565098 (1986-01-01), Herzl
patent: 4733559 (1988-03-01), Aine et al.

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