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US 7,395,827 B2Granted
Apparatus to produce acoustic cavitation in a liquid insonification medium
OwnerSameer I. Madanshettyinventor
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OwnerSameer I. Madanshettyinventor
Estimating the term…
An apparatus to produce acoustic cavitation by controlling cavitation events in a liquid insonification medium utilizing a waveform to excite a transducer with a series of bipolar inharmonic tone bursts having medium recovery intervals between respective bursts so that the medium repeatedly recovers from cavitation events between bursts. The apparatus may be used to clean a semiconductor wafer, to de-coat a painted surface having, to induce a chemical reaction, and/or to provide recycled paper made from inked paper de-inked by cavitation. Cavitation events are generated using a transducer and a waveform generator, e.g., square wave tone bursts, to excite the transducer with a signal controlled in frequency, burst repetition rate, duty-cycle and/or amplitude, e.g., utilizing bursts having a frequency between 500 KHz and 10 MHz, and a duty cycle between 0.1% and 70%.
A device to produce vacuous cavitation in a liquid medium, said device comprising a single transducer, an energizing source that powers the transducer with a bipolar inharmonic tone burst signal to produce an acoustic field in said medium wherein said tone burst signal has a duty cycle that defines on and off burst intervals thereby to produce a cavitation region in the medium having multiple high frequency and multiple lower frequency acoustic field components, a controller that controls at least one of duty cycle, amplitude, and frequency of said bipolar inharmonic tone burst signal, and a housing that provides acoustic coupling between said transducer and a workpiece through said medium,.
An apparatus that produces acoustically induced cavitation events relative to an object using a liquid insonification medium, said apparatus comprising a single-transducer resonant mode transducer module that operates in a thickness direction;
Dependencies are inferred from the claim text.