Hot element mass airflow sensor

Details Hot element mass airflow sensor Hot element mass airflow sensor

1985-10-31

1987-01-13

Levy, Stewart J.

Measuring and testing

Volume or rate of flow

Thermal type

731182, G01F 168

Patent

active

046354751

ABSTRACT:
To reduce the temperature compensation error of a hot element mass airflow sensor due to thermal radiation losses, the element is coated with a low emissivity material. In the case of a hot film sensor which comprises a thin metal foil resistor sandwiched between polymer layers, the outer surface is covered with a low emissivity coating comprising a thin metal layer which is highly reflective to infrared radiation. A circuit supplies energy to the element to heat it to a prescribed temperature; the power required to maintain that temperature correlates with the rate of convective energy loss to the airflow and thus to the rate of mass airflow.

REFERENCES:
patent: 4264961 (1981-04-01), Nishimura et al.
patent: 4373387 (1983-02-01), Nishimura et al.
patent: 4433576 (1984-02-01), Shih et al.
patent: 4474058 (1984-10-01), Drews et al.
Martino et al., "A Thermistor Anemometer for the Measurement of Very Low Air Velocities", 1971, The Review of Scientific Instruments, vol. 42, No. 5, pp. 606-609.

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