Hot film sensor for air flow meter

Details Hot film sensor for air flow meter Hot film sensor for air flow meter

1982-10-27

1984-05-01

Goldberg, Gerald

Measuring and testing

Volume or rate of flow

Thermal type

731182, G01F 168

Patent

active

044453698

ABSTRACT:
To measure the mass air flow in the induction passage of an engine, a small venturi located centrally in the passage serves as an air sampling tube. A slotted aperture in the wall of the tube at the venturi throat allows a hot film sensor to extend into the venturi throat from a support such as a printed circuit board mounted outside the venturi. The film sensor is in the form of a loop supported only at its ends on the support. The loop comprises a substrate of flexible insulating film material coated with an electrical resistance layer forming the active element of the sensor. The loop has a major dimension extending arcuately and transversely of the air flow through the venturi and a minor dimension extending parallel to the air flow.

REFERENCES:
patent: 3709035 (1973-01-01), De Fries et al.
patent: 4369656 (1943-01-01), Ueno et al.

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