Method and device for ultrasonic ranging

Details Method and device for ultrasonic ranging Method and device for ultrasonic ranging

1996-12-13

1998-08-11

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367 98, 367 97, 367908, 340943, 340621, G01S 1500

Patent

active

057937044

ABSTRACT:
A method and device for ultrasonic ranging. As in prior art devices, ultrasound pulses are transmitted by the device towards a target, and echo pulses from the target are received. The timing of the maximum of the amplitude envelope of the echo pulses is picked and used as a measure of the return time of these pulses. This maximum envelope time is relatively independent of the speed of sound between the device and the target. Preferably, the duration of the echo pulses is less than the response time of the receiving circuit, to enable an accurate pick of the amplitude envelope maximum.

REFERENCES:
patent: 4393711 (1983-07-01), Lapides
patent: 4428237 (1984-01-01), Zeger et al.
patent: 4933915 (1990-06-01), Bostrom
patent: 4972386 (1990-11-01), Lau
patent: 5394750 (1995-03-01), Matzuk

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