Low-range airspeed sensors
Duncan, Ralph E.
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The work reported herein is comprised of two parts: a critical assessment of the existing low airspeed sensors for helicopters and V/STOL aircraft and the development of two-dimensional jet interaction velocity sensors. The theory of operation, system description, associated electronics, advantages and disadvantages, and the development stage of the existing sensors (pilot-static system, optical convolution velocimeter, low-range orthogonal airspeed system, omnidirectional low-range airspeed sensor, swiveling probe air data system, and the fluid velocity sensor) have been critically discussed. The need to develop a low-airspeed sensor with no moving parts and a relatively linear sensitivity through the operating range and without excessive electronic amplification of the pressure signal led to the exploration of the jet-interaction. principle. This culminated in the development of a two-dimensional sensor with extremely encouraging results. Continued design and development will be required to bring the jet-interaction sensor to the point of field tests with helicopters and V-STOL aircraft.
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