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When the angle of attack of an aircraft is to be measured, a sensor must be physically used to take the readings while in flight. The sensor is usually located ahead of the aircraft, on the fuselage nose, or on a wing tip. These are the most commonly used placements to mount the sensors since they should usually be the first part of the aircraft to be affected by the incoming airflow (they are the parts of the aircraft that first disturb the airflow). Although these are the most common places to mount the sensors, they may be located on any part of the body of the aircraft as long as care is taken.
Computer Instruments Corporation
SpaceAge Control, Inc.