US 4,736,130 A · Multiparameter generator for ultrasonic transducers

Abstract

An ultrasonic frequency generator sets a plurality of parameters for a transducer to enable an ultrasonic operation to meet a plurality of criteria. The generator produces sets of power trains, each formed of a sequence of power bursts of an ultrasound signal having a variable amplitude and a variable frequency. The power bursts are provided with controllable durations and are separated from one another by controllable quiet times. A cavitation density function generator controls the amplitude of the power bursts. The power trains are provided with controlled durations, and variable degas time durations are included between sequences of bursts of the ultrasonic signals. A further function generator is used to control the frequency of the signal, thus providing a swept frequency burst. A controller is provided for setting the center frequency of the swept signal. The generator thus provides a waveform with seven controllable parameters which may be set to conform to any operational criteria.

Claims18

Dependent claims

An ultrasonic frequency generator for setting a plurality of parameters for driving a transducer in accordance with any predetermined criteria comprising:

controlled frequency generating means producing a frequency signal having a variably controlled swept frequency and variably selected center frequency therefor,
said frequency generating means including:
first control means for providing a time function for sweeping the frequency of said frequency signal and
second control means for setting the center frequency of said frequency signal, and
programming means for producing a programmed set of power trains each including a series of power bursts of said frequency signal, said power bursts having variably controlled durations and separated by variably controlled quiet times,
whereby the transducer is driven to apply bursts of ultrasonic energy to a liquid for controlled, predetermined durations and separated by controlled, predetermined quiet times at frequencies varying about a controllably selected frequency in a controlled time function.

3 more elements

An ultrasonic frequency generator for setting a plurality of parameters for driving a transducer in accordance with any predetermined criteria comprising:

controlled frequency generating means producting a frequency signal having variably controlled characterstics, and
programming means for producing a programmed set of power trains each including a series of power bursts of said frequency signal, said power bursts having variably controlled durations and separated by variably controlled quiet times,
said programming means includes power train time control means for setting a time duration during which a sequence of said power bursts are supplied to the transducer as a power train, and
degas time control means for providing a degas time of controllable duration between power trains supplied to the transducer,
whereby the transducer is driven to apply bursts of ultrasonic energy to a liquid for controlled, predetermined durations and separated by controlled, predetermined quiet times in power trains of controlled durations and separated by controlled degas times.

2 more elements

Dependencies are inferred from the claim text.

Multiparameter generator for ultrasonic transducers

Life of this patent

Multiparameter generator for ultrasonic transducers

Life of this patent

Abstract

Claims18