Angle of attack sensor using inverted ratio of pressure differen

Details Angle of attack sensor using inverted ratio of pressure differen Angle of attack sensor using inverted ratio of pressure differen

1991-08-08

1993-04-27

Woodiel, Donald O.

Measuring and testing

Navigation

Leeway incidence or side-slip

73178R, G01C 2100

Patent

active

052051692

ABSTRACT:
An angle of attack sensor is provided with ports for sensing flow angles in desired planes based upon differential pressure at the ports when a longitudinal or reference axis of the sensor changes relative to the flow stream. Impact pressure is also measured with the same probe, or with a separate probe, and the angle of attack is calculated by subtracting the pressures at the angle sensitive ports, and dividing by the measured impact pressure (q.sub.cm). At higher angles of attack, the denominator q.sub.cm approaches and passes through zero. When this quantity, q.sub.cm, approaches zero, the angle of attack signal becomes undefined. The problems encountered as q.sub.cm approaches zero has been a limitation of useful angle of attack range of angle of attack sensors for many years. It has been discovered that if the angle of attack ratio, where q.sub.cm is the denominator, is inverted at some point when the denominator q.sub.cm approaches zero, the useable range of indication of angle of attack can be greatly extended. The present invention provides apparatus and method for inverting the ratio at selected values of q.sub.cm.

REFERENCES:
patent: 3318146 (1967-05-01), De Leo et al.
patent: 4096744 (1978-06-01), De Leo et al.
patent: 4378696 (1983-04-01), De Leo et al.
patent: 4836019 (1989-06-01), Hagen et al.
patent: 5025661 (1991-06-01), McCormack

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