Measuring and testing – Volume or rate of flow – Thermal type
Patent
1975-03-13
1977-08-23
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
040431959
ABSTRACT:
An apparatus is disclosed for measuring instantaneous rate of flow and total flow of a fluid. The data are obtained by measuring the quantity of energy necessary to replace an equivalent amount of heat dissipated from a temperature-sensitive transducer disposed in the path of the fluid flow. An error signal, resulting from a transducer impedence change due to a differential temperature, induced by fluid flow, is placed in digital form and fed back to the transducer in a closed feedback loop configuration. The feedback signal is in the form of discrete power pluses. The number of such pulses is proportional to the heat removed from the transducer by the flow and thus is proportional to the fluid flow rate. The output pulses are counted and displayed in associated digital equipment.
REFERENCES:
patent: 2972885 (1961-02-01), Laub
patent: 3085431 (1963-04-01), Yerman et al.
patent: 3485099 (1969-12-01), Collins
patent: 3603147 (1971-09-01), Dorman
patent: 3683692 (1972-08-01), Lafitte
patent: 3803913 (1974-04-01), Tracer
patent: 3869914 (1975-03-01), Koehler
Hoffmann et al., "Analysis of the Thermal Flowmeter Operating from a Pulsed-Heat Injection Source", in Journal of Physics & Sci. Inst., 1972, vol. 5.
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