| 摘要 |
Method and apparatus that controls the onset, evolution, and/or intensity of microcavitation events in a liquid or fluid medium to perform, among other things, nanometer or micrometer particle detection in ultrapure liquids, sub-micron particle removal for precision cleaning of semiconductor wafers, deinking of paper or pulp, thin film removal from substrates, depainting substrates or panels, destructive and nondestructive measuring and testing of thin films, sculpting or erosion of surfaces, or control or acceleration of liquid-based chemical reactions. Instead of using sinusoidally excited, acoustically focused transducers operating at different fundamental resonance frequencies, cavitation events are instead generated using a single transducer and a waveform generator, e.g., square wave tone bursts, to excite the transducer with acoustic pulse trains controlled in frequency, burst repetition rate, duty-cycle and/or amplitude which, in turn, controls ACIM events in a more practical way for industrial, scientific and medical applications. The waveform generator produces those Fourier components which, when applied to the single transducer, achieve the same or similar ACIM acoustic field effect at a coaxing site as a pair of focused coaxing high and low frequency transducers. Multiple single-transducer acoustic coaxing systems and methods may be deployed in a common environment to achieve a desired application.
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