Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1981-12-11
1984-05-29
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
73900, 343 5SM, 367900, G01S 1510, G01S 752
Patent
active
044519095
ABSTRACT:
In an ultrasonic wave distance detection system, an ultrasonic wave pulse radiated into the selected area is reflected on an object. Said reflected ultrasonic wave pulse is partly received by an ultrasonic wave transducer. The received signal is supplied to a variable gain amplifier, noise components are removed from the amplified signal through a band pass filter, the noise removed signal is detected by an envelope detector, the detected signal is compared with a predetermined level by a comparator, and the output of the comparator is applied to a flip-flop circuit.
As the gain of the variable gain amplifier is set to be a lower level only at the beginning of the ultrasonic wave pulse to minimize the amplification of unnecessary signals without reducing the detection efficiency, a signal can be surely obtained which has a pulse width corresponding to the distance between the system and the object and thus the distance can be detected or measured.
REFERENCES:
patent: 3683324 (1972-08-01), Hoxsie
patent: 3787803 (1974-01-01), Beebe
patent: 3926039 (1975-12-01), Zhukov et al.
patent: 3942181 (1976-03-01), Berrod et al.
patent: 4205555 (1980-06-01), Hashiguchi
Akita Shigeyuki
Kodera Masao
Farley Richard A.
Nippon Soken Inc.
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