G - Physics – 01 – H
Patent
G - Physics
01
H
349/33
G01H 5/00 (2006.01) G01P 5/24 (2006.01) G01P 13/00 (2006.01)
Patent
CA 1093672
TITLE AN ULTRASONIC AIR DATA SYSTEM INVENTORS P.H. Barry MacLennan Graham A. Ireland William J. Werba ABSTRACT OF THE DISCLOSURE The ultrasonic air data system determines the rela- tive velocity of an aircraft with respect to the medium in one, two or three directions. In addition, it may determine the speed of sound and the approximate temperature. In the one direction system, a first ultrasonic transducer transmits a pulse to a second transducer where it is detected and reflected back to the first transducer and again reflected to the second transducer. The pulse transit times for each direction are determined, and the relative velocity, the speed of sound and the approximate temperature are provided as a function of the transit time. In the two or three direction systems, three or four transducers are positioned in a two or three dimensional configuration. In the first half cycle, the first transducer transmits a pulse to the second where it is reflected to the third or last transducer in a two-dimension system and then to the last transducer in a three-dimension system. In the second half-cycle, the last transducer trans- mits a pulse which is reflected through the transducer arrange- ment to the first transducer. Transit times for pulse travel in each direction between pairs of transducers are determined, and relative velocities, speed of sound and approximate temper- ature are provided as a function of these transit times.
297327
Ireland Graham A.
Maclennan P.h. Barry
Werba William J.
Ireland Graham A.
Maclennan P.h. Barry
Rymek Edward
Werba William J.
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