Hot-wire flow rate measuring apparatus

Details Hot-wire flow rate measuring apparatus Hot-wire flow rate measuring apparatus

1979-09-24

1981-11-03

Woodiel, Donald O.

Measuring and testing

Volume or rate of flow

Thermal type

73116, F02M 5100, G01F 168

Patent

active

042978815

ABSTRACT:
A hot-wire flow rate measuring apparatus comprises a series circuit including a first thermo-sensitive resistive element placed in the fluid path of a fluid and a first resistive element, a circuit for dividing the voltage across the first thermo-sensitive resistive element, a second thermo-sensitive resistor for temperature compensation placed in the fluid path of fluid, means for detecting the difference between the output voltage of the voltage dividing circuit and the output voltage of the second thermo-sensitive resistor for temperature compensation. Current fed to the series circuit is controlled in accordance with the detected voltage from the detecting means, and output means is provided for producing a voltage in accordance with the voltage across the resistive element, wherein the output voltage of the output means indicates a flow rate of fluid.

REFERENCES:
patent: 3747577 (1973-07-01), Mauch et al.
patent: 4089214 (1978-05-01), Egami et al.

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