Flow sensor

Details Flow sensor Flow sensor

1988-03-31

1989-12-12

Goldstein, Herbert

Measuring and testing

Navigation

Leeway incidence or side-slip

7320426, G01F 168

Patent

active

048859370

ABSTRACT:
A flow sensor for detecting the rate of flow and the direction of flow of a fluid, comprising a substrate, a heating element disposed on the substrate, and four or more fluid temperature sensing elements disposed with an equal space therebetween on a virtual circle around the heating element, wherein the difference in temperature between the fluid and the heating element is maintained at a fixed level by the control of current that is applied to the heating element, so that the flow rate of the fluid can be calculated from changes in the current that corresponds to the flow rate of the fluid, and at the same time, the difference in current or in potential between the fluid temperature sensing elements is calculated from changes in temperature therebetween that arise from changes in the direction of flow of the fluid, so that the direction of flow of the fluid can be detected.

REFERENCES:
patent: 3677085 (1972-07-01), Hayakawa
patent: 3995481 (1976-12-01), Djorup
patent: 4024761 (1977-05-01), Djorup
patent: 4135396 (1979-01-01), Stanke et al.
patent: 4391137 (1983-07-01), Kerfoot et al.
patent: 4399698 (1983-08-01), Hiromasa et al.
patent: 4478076 (1984-10-01), Bohrer
patent: 4576050 (1986-03-01), Lambert
patent: 4587843 (1986-05-01), Tokura et al.
patent: 4637253 (1987-01-01), Sekimura et al.

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