Ultrasonic systems

Details Ultrasonic systems Ultrasonic systems

1990-05-30

1991-07-16

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Miscellaneous

181 05, 367137, H04B 102

Patent

active

050330330

ABSTRACT:
A method of establishing an ultrasonic standing wave in a fluid medium is described in which the standing wave is produced by an acoustic energy output along a path extending through the fluid medium, the frequency of said energy output being changed cyclically while maintaining an essentially constant mean frequency. The cyclic frequency change sweeps said energy output frequency between upper and lower limits that represent a difference of at least one half-wavelength at the mean acoustic frequency over the length of said path, so that a fully resonant standing wave appears in each cycle, regardless of transient ambient variations. For stability, the cycle time of the sweep is maintained substantially greater than the travel time of the acoustic energy output over the length of the path.

REFERENCES:
patent: 3070097 (1963-01-01), Scarpa
patent: 4463606 (1984-08-01), Barmatz
patent: 4554477 (1985-08-01), Ratcliff
patent: 4673512 (1987-06-01), Schram
patent: 4688199 (1987-08-01), Lak
patent: 4743361 (1988-05-01), Schram
patent: 4941135 (1990-07-01), Schram

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