Lift force fluid flow sensor for measuring fluid flow velocities

Details Lift force fluid flow sensor for measuring fluid flow velocities Lift force fluid flow sensor for measuring fluid flow velocities

1997-06-12

2000-05-02

Patel, Harshad

Measuring and testing

Volume or rate of flow

By measuring thrust or drag forces

7386174, 73719, 7317015, 604533, G01F 128, G01F 1300

Patent

active

060558695

ABSTRACT:
A fluid flow sensor uses lift forces exerted on a plate-like airfoil member to determine the velocity of a fluid flowing past the sensor. The member has a pair of spaced, low aspect ratio airfoil elements. A central portion of the airfoil member is coupled to a frame that positions the airfoil member in the fluid flow with an angle of attack with respect to the fluid flow direction. The flowing fluid generates velocity related lift forces on the airfoil member, the magnitude of which decrease along the airfoil member from the upstream end to the downstream end. The lift forces so applied deflect the upstream airfoil element to a greater extent than the downstream airfoil element. Strain gauges are coupled to the airfoil elements to detect their deflection. The strain gauges are connected in a bridge configuration to provide a signal indicative of fluid velocity.

REFERENCES:
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patent: 3696673 (1972-10-01), Ribner et al.
patent: 4843445 (1989-06-01), Stemme
patent: 5131265 (1992-07-01), Tobin et al.
patent: 5319971 (1994-06-01), Osswald et al.
Patent Abstracts of Japan, JP 61071366 (Kawashima Sumihiko), Apr. 12, 1986.

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