Ultrasonic rangefinder

Details Ultrasonic rangefinder Ultrasonic rangefinder

1979-11-19

1981-12-22

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367108, 367900, 343 5SM, G01S 1514

Patent

active

043074561

ABSTRACT:
An ultrasonic rangefinder providing a correct distance measurement and comprising a first transducer for transducing electric signals into ultrasonic waves and transmitting the ultrasonic waves, a second transducer for receiving the ultrasonic waves and transducing the ultrasonic waves into electric signals, a differentiation circuit, and a comparator for comparing a level of a differentiated output signal from the differentiation circuit with an output signal level of the second transducer and detecting a threshold time when the level of the differentiated output signal from the differentiation circuit becomes lower then the output signal level of the second transducer where a threshold signal level of the comparator is automatically varied with respect to a time lapse of the travelling ultrasonic waves coming back to the rangefinder after being reflected by an object, thus overcoming the conventional problems due to the spurious-like direct waves.

REFERENCES:
patent: 2780795 (1957-02-01), Ambrosio
patent: 3522764 (1970-08-01), Biber et al.
patent: 4169263 (1979-09-01), Hooker, Jr.

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