Non-obstructive thermodynamic fluid flow meter

Details Non-obstructive thermodynamic fluid flow meter Non-obstructive thermodynamic fluid flow meter

1986-11-19

1988-06-28

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

047531118

ABSTRACT:
A fluid flow meter using a pair of temperature-variable resistance elements as detectors. Both elements are exposed to the fluid flow and supplied with a series of current pulses. The pulses supplied to one element, the reference element, are of very short duration so as to have no appreciable heating effect; the pulses supplied to the other element are of longer duration and are controlled so as to maintain this element at a fixed temperature differential above the other element, which remains at fluid temperature. The pulse width of the longer duration pulses is a measure of the flow rate of the fluid. Since the relationship between heat dissipated in the element and fluid flow varies with fluid temperature, the voltage pulses across the reference element are used as a measure of fluid temperature to compensate for this variation in calculating the exact fluid flow rate.

REFERENCES:
patent: 3603147 (1971-09-01), Dorman
patent: 3928800 (1975-12-01), Strenglein
patent: 4043195 (1977-08-01), Hunting
patent: 4244217 (1981-01-01), Ledbetter
patent: 4334186 (1982-06-01), Sasayama et al.
patent: 4335605 (1982-06-01), Boyd
patent: 4404638 (1983-09-01), Yada et al.
patent: 4616505 (1986-06-01), Jouwsma
patent: 4649745 (1987-03-01), Kondo et al.
patent: 4665745 (1987-05-01), Ina et al.

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