Ultrasonic air data system

Details Ultrasonic air data system Ultrasonic air data system

1977-08-26

1978-09-12

Ruehl, Charles A.

Measuring and testing

Navigation

Ship's log

73194A, 73597, G01P 500

Patent

active

041127560

ABSTRACT:
The ultrasonic air data system determines the relative 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 transmit 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 transmits a pulse which is reflected through the transducer arrangement 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 temperature are provided as a function of these transit times.

REFERENCES:
patent: 3222926 (1965-12-01), Carver
patent: 3901078 (1975-08-01), McShane
patent: 4015470 (1977-04-01), Morrison
patent: 4031756 (1977-06-01), Rotier et al.

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