Ultrasonic ranging system and method thereof in air by using...

Details Ultrasonic ranging system and method thereof in air by using... Ultrasonic ranging system and method thereof in air by using...

2007-03-27

2007-03-27

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Parametric sonar

Reexamination Certificate

active

10960083

ABSTRACT:
An ultrasonic ranging method for measuring a distance to an object in an air includes the steps of generating a first and a second primary ultrasonic waves having a frequency f1and f2, respectively, transmitting the first and the second primary ultrasonic waves in a same direction, wherein a secondary ultrasonic wave having a frequency corresponding to the difference of two frequencies fd=f1−f2is created by a nonlinear property of the air and radiated to the object, detecting an echo pulse of the secondary ultrasonic wave reflected from the object, and measuring the distance to the object based on a propagation time of the secondary wave.

REFERENCES:
patent: 4308599 (1981-12-01), Thiele
patent: 8-80300 (1996-03-01), None
patent: 10-73654 (1998-03-01), None
patent: 2000-111645 (2000-04-01), None

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